Fire Resistant Plants for Colorado | Top 100 Guide
- Megan Banich
- Apr 11, 2025
- 17 min read
Updated: Jul 30
Choosing fire resistant plants for Colorado requires more than finding species labeled drought tolerant. This guide compares 100 perennials, groundcovers, shrubs, and trees by ignitability, water needs, elevation, mature size, and recommended defensible-space placement. You will learn which plants are appropriate for different parts of a Colorado landscape and how spacing, irrigation, pruning, and maintenance affect wildfire behavior.
This guide will help you choose fire-resistant plants for Colorado landscapes, including the top perennials, groundcovers, shrubs, and trees for long-term resilience. You will also learn how elevation, water requirements, mature size, and ignition ratings affect where each plant should be placed.
By the end of this reading, you will have a practical plant list and a better understanding of how to design a landscape that can handle wildfire risk, drought, flooding, pests, and Colorado’s changing climate.
Why Colorado’s Planting Zones Are Changing
Before we dive into the plant lists, it is important to understand how Colorado’s changing climate is reshaping where different plants can thrive. Colorado’s planting conditions are changing. As temperatures rise, the areas where plants can survive are shifting northward, upward in elevation, or into cooler microclimates. Quaking aspens are already experiencing heat and drought stress in warmer portions of their range, while new aspen growth has been documented establishing upslope after severe wildfires. Across the Southwest, climate models also show suitable habitat for Joshua trees and some pinyon-juniper ecosystems shifting toward cooler, higher, and more northern locations. They are not literally marching toward Colorado, but they clearly show how quickly yesterday’s dependable planting zones can become tomorrow’s climate stress zones.
You can see these changes during a single road trip. Drive from Arizona toward Colorado and the landscape moves through desert plants, pinyon-juniper woodlands, grasslands, foothill forests, montane forests, and alpine environments. Elevation, temperature, slope, sunlight, wind, soil, and available moisture can change dramatically within a relatively short distance. Those same differences can occur between two Colorado properties located only a few miles apart.
That is why long-term landscape design should consider more than a plant’s current USDA hardiness zone. We need to ask whether vegetation can survive future heat, drought, wildfire conditions, heavy rain, flooding, pests, fungal pressure, intense sunlight, drying winds, and the specific elevation of the property. Colorado is expected to experience continued warming, more extreme fire-weather conditions, and an increased risk of heavy rainfall events that may contribute to flooding.
No plant is truly fireproof. However, some species contain more moisture, produce less combustible debris, and ignite less readily than others. Dense, resinous plants such as juniper can ignite quickly and burn with intense heat, acting almost like kindling when wildfire reaches a property.
Plants are a huge part of the climate solution. Through photosynthesis, vegetation removes carbon dioxide from the atmosphere and stores carbon in plant material, roots, and soil. Healthy soil with greater organic matter can hold more water, improve infiltration, reduce erosion, and help landscapes remain cooler and more resilient during heat, drought, and heavy rainfall. Climate Hubs USDA likes to call this Carbon Farming. Landscaping alone cannot reverse climate change, but healthy vegetation and living soil play meaningful roles in both climate mitigation and adaptation.
Firewise landscaping does not mean ripping every plant out of the ground and replacing the entire property with rock. The first 0–5 feet surrounding a structure should remain primarily noncombustible, but the rest of the landscape can include thoughtfully selected and properly spaced vegetation. The goal is to use rock, pathways, patios, irrigated planting islands, rainwater-capturing soil, and lower-ignitability plants together so the property remains beautiful, ecologically productive, and less likely to carry fire toward the home.
Understanding the Firewise Plant Index
Colorado State University’s current plant guidance uses an ignitability scale from 0 to 10:
10: Lowest ignitability
9–9.5: Excellent
8: Good
5–7.5: Moderate; generally better in outer areas
0–4: Higher concern near structures
NR: No dependable numerical rating is available
CSU recommends prioritizing plants rated 8, 9, or 10 in landscaped areas located 5–30 feet from a structure. However, no plant is fireproof. Plant spacing, irrigation, pruning, mature size, drought stress, and accumulated dead material can all significantly affect how vegetation behaves during a wildfire. Because CSU ratings may be updated over time, always check the current CSU fire-resistance index before selecting plants.
Top 10 Fire-Resistant Perennials for Colorado
Perennials return each year while providing flowers, pollinator habitat, living roots, and seasonal color. The right perennial should match the property’s sunlight, available water, elevation, and wildfire exposure. My favorite three choices include yarrow, Rocky Mountain columbine, blanket flower, and Coronado Red hyssop, but these are the ten I recommend considering for Colorado.
1. Common Yarrow
Sun: Sun–part sun | Water: Low–high | Elevation: 5,000–10,000 ft | Index: 9.5
Resilience: Highly adaptable; remove dry flower stalks.
2. Nodding Onion
Sun: Sun–part sun | Water: Low–high | Elevation: 5,000–10,000 ft | Index: 10
Resilience: Compact, moisture-holding foliage with excellent cold tolerance.
3. Harebell
Sun: Full sun | Water: Moderate–high | Elevation: 5,000–10,000 ft | Index: 9.5
Resilience: Long blooming and dependable in cooler mountain conditions.
4. Western Wallflower
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–10,000 ft | Index: 9
Resilience: Handles elevation well; remove dry upright stems.
5. Rocky Mountain Columbine
Sun: Sun–part sun | Water: Moderate–high | Elevation: 5,000–10,000 ft | Index: 8
Resilience: Excellent for cooler, partially shaded Colorado gardens.
6. Blanket Flower
Sun: Full sun | Water: Low–moderate | Elevation: 5,000–10,000 ft | Index: 8
Resilience: Heat-, drought-, and pollinator-friendly once established.
7. Prairie Smoke
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–10,000 ft | Index: 8
Resilience: Compact native with good cold and elevation tolerance.
8. Butterfly Weed
Sun: Full sun | Water: Low–moderate | Elevation: 5,000–6,000 ft | Index: 8
Resilience: Handles heat and drought but is best at lower elevations.
9. Lewis Blue Flax
Sun: Full sun | Water: Low | Elevation: 5,000–8,000 ft | Index: 8
Resilience: Low-water and adaptable; remove excess dry stems.
10. Coronado Red Hyssop
Sun: Sun–part sun | Water: Low–moderate | Elevation: Up to 6,200 ft | Index: NR
Resilience: Compact and drought-tolerant, but aromatic; use in separated outer areas.
Top 10 Fire-Resistant Groundcovers for Colorado
Groundcovers protect soil, reduce erosion, soften hardscape, and can replace portions of combustible mulch. They should remain low, maintained, and separated so they do not create an uninterrupted path for fire. These are ten of the strongest options for Colorado rock gardens, pathways, slopes, and planting islands.
1. Hens and Chicks
Sun: Sun–part sun | Water: Low–moderate | Elevation: 5,000–10,000 ft | Index: 10
Resilience: Succulent foliage stores moisture and creates little fuel.
2. Stonecrop Sedum
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–10,000 ft | Index: 10
Resilience: Excellent fire rating with strong drought and cold tolerance.
3. Hardy Ice Plant
Sun: Full sun | Water: Low | Elevation: Varies by cultivar | Index: 10
Resilience: Succulent and heat-tolerant; requires excellent drainage.
4. Wild Strawberry
Sun: Sun–part shade | Water: Moderate | Elevation: 5,000–11,000 ft | Index: 9
Resilience: Protects soil, controls erosion, and tolerates high elevations.
5. Elfin Thyme
Sun: Full sun | Water: Low | Elevation: 4,000–10,000 ft | Index: 8
Resilience: Works between stones; keep free of leaves and debris.
6. Woolly Creeping Speedwell
Sun: Full sun | Water: Low–moderate | Elevation: 5,000–9,000 ft | Index: 8
Resilience: Low-growing and adaptable to dry, rocky planting areas.
7. Pussytoes
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–10,000 ft | Index: 8
Resilience: Silver native foliage handles wind, cold, and lean soil.
8. Poppy Mallow
Sun: Full sun | Water: Low | Elevation: 5,000–8,000 ft | Index: 8
Resilience: Heat- and drought-tolerant; leave space between plants.
9. Rockcress
Sun: Full sun | Water: Low–high | Elevation: 5,000–10,000 ft | Index: 8
Resilience: Cold-hardy and useful on slopes; prune after flowering.
10. Basket of Gold
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–9,000 ft | Index: 8
Resilience: Strong spring color; remove dry flowers after blooming.
Top 10 Fire-Resistant Shrubs and Broadleaf Evergreens
Shrubs provide structure, screening, flowers, fruit, and wildlife habitat, but their woody growth creates more potential fuel than most perennials. Mature size, spacing, moisture, resin, and dead-material buildup should all be considered before placement. These selections include deciduous shrubs and broadleaf evergreen yuccas rather than highly resinous evergreen conifers.
1. Cheyenne Mock Orange
Sun: Full sun | Water: Moderate | Elevation: 5,000–9,000 ft | Index: 8Resilience: Cold-hardy and adaptable; periodically remove old stems.
2. Common Snowberry
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–9,000 ft | Index: 8Resilience: Handles partial shade and provides wildlife habitat.
3. New Jersey Tea
Sun: Full sun | Water: Moderate | Elevation: 5,000–7,500 ft | Index: 8
Resilience: Compact and pollinator-friendly; best at lower elevations.
4. Common Lilac
Sun: Full sun | Water: Low–moderate | Elevation: Up to 9,000 ft | Index: NR
Resilience: Cold-hardy and drought-tolerant once established; prune deadwood and watch for powdery mildew.
5. Autumn Amber Sumac
Sun: Sun–part sun | Water: Low | Elevation: 5,000–7,500 ft | Index: 8
Resilience: Low-growing cultivar suitable for separated planting islands.
6. Beaked Hazelnut
Sun: Sun–shade | Water: High | Elevation: 5,000–7,500 ft | Index: 8
Resilience: Moisture-loving and deciduous; use only where water is dependable.
7. Soapweed Yucca
Sun: Sun–part sun | Water: Very low–low | Elevation: 5,000–7,000 ft | Index: 8
Resilience: Evergreen, drought-tolerant, and moisture-holding.
8. Banana Yucca
Sun: Sun–part sun | Water: Very low–low | Elevation: 5,000–6,000 ft | Index: 8
Resilience: Strong in hot, dry, well-drained lower-elevation sites.
9. Adam’s Needle Yucca
Sun: Sun–part sun | Water: Moderate | Elevation: 5,000–8,000 ft | Index: 8
Resilience: Provides evergreen structure without resinous needles.
10. Utah Serviceberry
Sun: Full sun | Water: Very low–moderate | Elevation: 5,000–7,000 ft | Index: 7.5
Resilience: Drought-tolerant with fruit and habitat value; place beyond 30 feet.
Best Indexed Trees for Colorado’s Outer Defensible Space
Trees provide shade, cooling, habitat, and long-term carbon storage, but their mature size makes placement and maintenance especially important. Many deciduous trees have moderate Firewise ratings and belong farther into Zone 3: as a general guide, an index of 8 indicates about 30 feet or more from a structure, 7 indicates 40 feet, 6 indicates 50 feet, and 4 indicates approximately 70 feet or more. You must also remove ladder fuels—shrubs, tall grasses, low branches, and smaller trees that allow fire to climb from the ground into the canopy—while keeping branches pruned away from roofs and removing deadwood. If a large tree catches fire and falls or drops burning branches or falls onto the home, it can undo much of the protection created throughout the rest of the landscape.
1. Quaking Aspen
Sun: Full sun | Water: Moderate | Elevation: 5,000–10,000 ft | Index: 8
Resilience: High-elevation native; vulnerable to prolonged heat, drought, disease, and uncontrolled suckering.
2. Crabapple
Sun: Full sun | Water: Moderate | Elevation: 4,500–8,000 ft | Index: 8
Resilience: Cold-hardy and manageable; select disease-resistant cultivars and remove fallen debris.
3. Utah Serviceberry
Sun: Full sun | Water: Very low–moderate | Elevation: 5,000–7,000 ft | Index: 7.5
Resilience: Drought-tolerant small tree or large shrub with flowers, fruit, and wildlife value.
4. Cockspur Hawthorn
Sun: Full sun | Water: Low–moderate | Elevation: Up to 8,000 ft | Index: 7
Resilience: Cold-hardy with flowers and persistent fruit; select a thornless variety when possible.
5. Schubert Chokecherry
Sun: Sun–part shade | Water: Low–moderate | Elevation: Up to 8,500 ft | Index: 6
Resilience: Hardy and wildlife-friendly; manage suckering and thin dense interior growth.
6. Rocky Mountain Maple (AKA Douglas or Sierra Maple)
Sun: Sun–part shade | Water: Low–moderate | Elevation: 5,000–10,500 ft | Index: 6
Resilience: Colorado native that tolerates elevation and partial shade; often grows as a small multi-stemmed tree.
7. Bigtooth Maple (AKA Western Sugar Maple)
Sun: Full sun | Water: Moderate | Elevation: Approximately 4,500–8,000 ft | Index: 6
Resilience: Handles dry conditions and alkaline soil once established.
8. Thinleaf Alder
Sun: Sun–part sun | Water: High | Elevation: 5,000–9,000 ft | Index: 6
Resilience: Strong option for moist drainage areas, swales, and streamside soils.
9. Common Hackberry
Sun: Full sun | Water: Low–moderate | Elevation: Up to 7,000 ft | Index: 4
Resilience: Wind-, snow-, drought-, and alkaline-soil tolerant; place well into the outer defensible-space zone.
10. Water Birch
Sun: Part sun | Water: High | Elevation: 5,000–8,000 ft | Index: 4
Resilience: Useful in cool, reliably moist areas; place well away from structures and remove deadwood.
How to Choose Fire-Resistant Plants for Colorado by Defensible Space Zone
Firewise landscaping in Colorado begins with placing vegetation according to its distance from the home. Zone 0, the first 0–5 feet surrounding a structure, should remain primarily noncombustible using materials such as rock, gravel, concrete, or pavers. Zone 1, located 5–30 feet from the home, should prioritize well-spaced, regularly maintained plants with low ignitability ratings, ideally CSU-rated 8–10. Zone 2 extends farther into the property and can include larger shrubs and trees, provided ladder fuels, dead branches, dry grasses, and dense vegetation are removed. Thoughtful spacing, irrigation, pruning, and ongoing maintenance are just as important as plant selection because even fire-resistant plants can become hazardous when they are dry, overgrown, or surrounded by accumulated debris.
Top 100 Colorado Fire-Resistant - Plant Index
Index 10 represents the lowest ignitability. NR means no dependable numerical rating is currently listed for the specific species. Mature size is shown as height × width and may vary by cultivar, elevation, water, soil, and growing conditions.
*Index values, sunlight, water needs, and elevation ranges are approximate. Property-specific conditions—including soil, exposure, slope, wind, irrigation, maintenance, and microclimate—can substantially affect plant performance and fire behavior. Because CSU ratings may be updated over time, its safe to check the current CSU fire-resistance index before selecting plants.
Plant | Botanical Name | Water | Elevation | Index | Mature Size H × W |
Geyer’s onion | Allium geyeri | Low–high | 5,000–10,000 ft | 10 | 10 in × 4 in |
Sea thrift | Armeria maritima | Low–high | 5,000–10,000 ft | 8 | 6 in × 9 in |
Yellow stonecrop | Sedum lanceolatum | Moderate | 5,000–10,000 ft | 10 | 6 in × 1 ft |
Sand lily | Leucocrinum montanum | Low–moderate | 5,000–8,000 ft | 10 | 9 in × 9 in |
Pussytoes | Antennaria spp. | Moderate | 5,000–10,000 ft | 8 | 3–6 in × 12–18 in |
Nodding onion | Allium cernuum | Low–high | 5,000–10,000 ft | 10 | 1 ft × 9 in |
Alpine mouse-ear | Cerastium alpinum var. lanatum | Moderate | 5,000–10,000 ft | 8 | 9 in × 1 ft |
Alpine skullcap | Scutellaria alpina ‘Moonbeam’ | Moderate | 4,000–8,000 ft | 8 | 9 in × 1 ft |
Small-leaf pussytoes | Antennaria parvifolia | Moderate | 5,000–10,000 ft | 8 | 4 in × 1 ft 6 in |
Harebell | Campanula rotundifolia | Moderate–high | 5,000–10,000 ft | 9.5 | 1 ft × 1 ft |
Heartleaf bergenia | Bergenia cordifolia | Moderate | 5,000–9,000 ft | 8 | 1 ft × 1 ft |
Little Gem candytuft | Iberis sempervirens ‘Little Gem’ | Moderate | 4,500–9,000 ft | 8 | 1 ft × 1 ft |
Front Range beardtongue | Penstemon virens | Moderate | 5,000–10,000 ft | 8 | 6 in × 1 ft 6 in |
Germander beardtongue | Penstemon teucrioides | Low–moderate | 5,000–10,000 ft | 8 | 6 in × 1 ft 6 in |
Hens and chicks | Sempervivum spp. | Low–moderate | 5,000–10,000 ft | 10 | 6 in × 1 ft 6 in |
Utah milkvetch | Astragalus utahensis | Low | 5,000–6,000 ft | 8 | 6 in × 1 ft 6 in |
Woolly creeping speedwell | Veronica pectinata | Low–moderate | 5,000–9,000 ft | 8 | 6 in × 1 ft 6 in |
Hardy ice plant | Delosperma spp. | Low | Varies by cultivar | 10 | 1–6 in × 18–24 in |
Turkish speedwell | Veronica liwanensis | Low | Up to 8,500 ft | 8 | 1 in × 2 ft |
Elfin thyme | Thymus serpyllum ‘Minus’ | Low | 4,000–10,000 ft | 8 | 3 in × 2 ft |
Barren strawberry | Waldsteinia spp. | Moderate–high | 5,000–9,000 ft | 8 | 9 in × 1 ft 6 in |
Rockcress | Arabis spp. | Low–high | 5,000–10,000 ft | 8 | 9 in × 1 ft 6 in |
Starry Eyes cupflower | Nierembergia gracilis ‘Starry Eyes’ | Moderate | 4,500–5,500 ft | 8 | 10 in × 1 ft 6 in |
Bugleweed | Ajuga reptans | High | 5,000–10,000 ft | 8 | 4 in × 2 ft |
Creeping white cup | Nierembergia repens | Moderate–high | 4,500–5,500 ft | 8 | 4 in × 2 ft |
Basket of gold | Aurinia saxatilis | Moderate | 5,000–9,000 ft | 8 | 1 ft × 1 ft 6 in |
False rockcress | Aubrieta spp. | Moderate | 5,000–9,000 ft | 8 | 1 ft × 1 ft 6 in |
Porter aster | Symphyotrichum porteri | Low–moderate | 5,000–10,000 ft | 8 | 1 ft × 1 ft 6 in |
Prairie smoke | Geum triflorum | Moderate | 5,000–10,000 ft | 8 | 1 ft 6 in × 1 ft |
Hardy yellow ice plant | Delosperma nubigenum | Moderate–high | 5,000–8,000 ft | 10 | 6 in × 2 ft |
Stonecrop sedum | Sedum spp. | Moderate | 5,000–10,000 ft | 10 | 6–18 in × 12–24 in |
Coronado Red hyssop | Agastache ‘Pstessene’ | Low–moderate | Up to 6,200 ft | NR | 18 in × 12–16 in |
Coral Canyon twinspur | Diascia integerrima ‘Coral Canyon’ | Moderate | 4,000–7,000 ft | 9 | 1 ft 3 in × 1 ft 6 in |
Rocky Mountain columbine | Aquilegia caerulea | Moderate–high | 5,000–10,000 ft | 8 | 12–24 in × 12–18 in |
Spotted deadnettle | Lamium spp. | Moderate–high | 5,000–10,000 ft | 8 | 10 in × 2 ft |
Evening primrose | Oenothera speciosa | Low–moderate | 4,000–7,000 ft | 8 | 1 ft × 2 ft |
Missouri iris | Iris missouriensis | Moderate–high | 5,000–10,000 ft | 9.5 | 1 ft 6 in × 1 ft 6 in |
Prairie bluebell | Mertensia lanceolata | Moderate | 5,000–10,000 ft | 10 | 1 ft 6 in × 1 ft 6 in |
Rockrose | Helianthemum nummularium | Moderate–high | 5,000–8,000 ft | 8 | 1 ft 6 in × 1 ft 6 in |
Western wallflower | Erysimum capitatum | Moderate | 5,000–10,000 ft | 9 | 1 ft 6 in × 1 ft 6 in |
Lewis blue flax | Linum lewisii | Low | 5,000–8,000 ft | 8 | 2 ft × 1 ft |
Cushion spurge | Euphorbia polychroma | Low | 5,000–8,000 ft | 10 | 1 ft 3 in × 2 ft |
Golden Fleece goldenrod | Solidago sphacelata ‘Golden Fleece’ | Very low–moderate | 4,000–8,000 ft | 8 | 1 ft 3 in × 2 ft |
Lady’s mantle | Alchemilla mollis | Moderate–high | 5,000–9,000 ft | 8 | 1 ft 3 in × 2 ft |
Golden columbine | Aquilegia chrysantha | Moderate–high | 5,000–10,000 ft | 8 | 1 ft 6 in × 2 ft |
Butterfly weed | Asclepias tuberosa | Low–moderate | 5,000–6,000 ft | 8 | 2 ft × 1 ft 6 in |
Poppy mallow | Callirhoe involucrata | Low | 5,000–8,000 ft | 8 | 6 in × 3 ft |
Blanket flower | Gaillardia aristata | Low–moderate | 5,000–10,000 ft | 8 | 2 ft × 2 ft |
Common yarrow | Achillea millefolium | Low–high | 5,000–10,000 ft | 9.5 | 2 ft × 2 ft |
Garden sage | Salvia officinalis | Low–moderate | 5,000–8,000 ft | 7.5 | 2 ft × 2 ft |
Jupiter’s beard | Centranthus ruber | Low–high | 5,000–10,000 ft | 10 | 2 ft × 2 ft |
Lupine | Lupinus spp. | Low–moderate | 5,000–10,000 ft | 8 | 2 ft × 2 ft |
Plains coreopsis | Coreopsis tinctoria | Low–moderate | 5,000–10,000 ft | 8 | 2 ft × 2 ft |
Prickly pear cactus | Opuntia spp. | Very low | 5,000–7,500 ft | 10 | 2 ft × 2 ft |
Tickseed | Coreopsis spp. | Moderate | 5,000–8,000 ft | 8 | 2 ft × 2 ft |
Oriental poppy | Papaver orientale | High | 5,000–10,000 ft | 8 | 2 ft 6 in × 1 ft 6 in |
Hardy plumbago | Ceratostigma plumbaginoides | Low | 5,000–6,000 ft | 8 | 6 in × 4 ft |
Kinnikinnick | Arctostaphylos uva-ursi | Low | Up to 10,000 ft | 5 | 6 in × 4 ft |
Mat penstemon | Penstemon caespitosus | Low–moderate | 5,000–10,000 ft | 8 | 8 in × 4 ft |
Northern bedstraw | Galium boreale | Moderate–high | 5,000–10,000 ft | 8 | 8 in × 4 ft |
Snow-in-summer | Cerastium tomentosum | Low–moderate | 5,000–9,000 ft | 8 | 8 in × 4 ft |
Wild strawberry | Fragaria spp. | Moderate | 5,000–11,000 ft | 9 | 8 in × 4 ft |
Rocky Mountain geranium | Geranium caespitosum | Moderate | 5,000–10,000 ft | 8 | 2 ft × 3 ft |
Spreadfruit golden banner | Thermopsis rhombifolia var. divaricarpa | Moderate–high | 5,000–10,000 ft | 8 | 2 ft × 3 ft |
Daylily | Hemerocallis spp. | Low–moderate | 5,000–7,500 ft | 10 | 3 ft × 2 ft |
Crimson Pygmy barberry | Berberis thunbergii ‘Atropurpurea Nana’ | Moderate | 5,000–7,500 ft | 8 | 2 ft 6 in × 3 ft |
Adam’s needle yucca | Yucca filamentosa | Moderate | 5,000–8,000 ft | 8 | 3 ft × 3 ft |
Red hot poker | Kniphofia uvaria | Low | 5,000–6,000 ft | 8 | 3 ft × 3 ft |
Shrubby cinquefoil | Potentilla fruticosa | Low–moderate | 6,000–9,000 ft | 5 | 3 ft × 3 ft |
Banana yucca | Yucca baccata | Very low–low | 5,000–6,000 ft | 8 | 3 ft × 4 ft |
Pawnee Buttes sand cherry | Prunus pumila var. besseyi ‘Pawnee Buttes’ | Low | Up to 7,500 ft | 7 | 1 ft 6 in × 6 ft |
Creeping Oregon grape | Mahonia repens | Low–moderate | Up to 10,000 ft | 4 | 2 ft × 6 ft |
New Jersey tea | Ceanothus americanus | Moderate | 5,000–7,500 ft | 8 | 3 ft × 5 ft |
Soapweed yucca | Yucca glauca | Very low–low | 5,000–7,000 ft | 8 | 4 ft × 4 ft |
Cholla cactus | Cylindropuntia spp. | Very low–moderate | 5,000–6,000 ft | 8 | 5 ft × 5 ft |
Common snowberry | Symphoricarpos albus | Moderate | 5,000–9,000 ft | 8 | 5 ft × 5 ft |
Beaked hazelnut | Corylus cornuta | High | 5,000–7,500 ft | 8 | 5 ft 6 in × 5 ft |
Autumn Amber sumac | Rhus trilobata ‘Autumn Amber’ | Low | 5,000–7,500 ft | 8 | 2 ft × 10 ft |
Cheyenne mock orange | Philadelphus lewisii ‘Cheyenne’ | Moderate | 5,000–9,000 ft | 8 | 6 ft × 6 ft |
Utah serviceberry | Amelanchier alnifolia var. utahensis | Very low–moderate | 5,000–7,000 ft | 7.5 | 4–15 ft × 4–12 ft |
Common lilac | Syringa vulgaris | Low–moderate | Up to 9,000 ft | NR | 6–12 ft × 6–12 ft |
Sargent crabapple | Malus sargentii | Moderate | Up to 8,000 ft | 8 | 8 ft × 10 ft |
Cockspur hawthorn | Crataegus crus-galli | Low–moderate | Up to 8,000 ft | 7 | 15 ft × 15 ft |
Douglas hawthorn | Crataegus douglasii | Moderate | Up to 9,000 ft | 7 | 15 ft × 15 ft |
Desert willow | Chilopsis linearis | Low | Below about 6,000 ft | 7 | 18 ft × 15 ft |
Dolgo crabapple | Malus ‘Dolgo’ | Moderate | Up to 8,000 ft | 8 | 18 ft × 15 ft |
Thinleaf alder | Alnus tenuifolia | High | 5,000–9,000 ft | 6 | 20 ft × 15 ft |
Crabapple | Malus spp. | Moderate | 4,500–8,000 ft | 8 | 15–25 ft × 15–25 ft |
Water birch | Betula occidentalis | High | 5,000–8,000 ft | 4 | 25 ft × 15 ft |
Schubert chokecherry | Prunus virginiana ‘Schubert’ | Low–moderate | Up to 8,500 ft | 6 | 20–25 ft × 15–25 ft |
Rocky Mountain maple | Acer glabrum | Low–moderate | 5,000–10,500 ft | 6 | 20–30 ft × 15–20 ft |
European mountain ash | Sorbus aucuparia | Moderate | Up to 8,000 ft | 6 | 20 ft × 30 ft |
Bigtooth maple | Acer grandidentatum | Moderate | 4,500–8,000 ft | 6 | 25–35 ft × 20–30 ft |
Netleaf hackberry | Celtis reticulata | Low | Up to 7,500 ft | 6 | 30 ft × 25 ft |
Thornless honeylocust | Gleditsia triacanthos var. inermis | Moderate | Lower Front Range | 4 | 40 ft × 40 ft |
Boxelder | Acer negundo | Moderate | Generally below 8,000 ft | 5 | 50 ft × 35 ft |
Quaking aspen | Populus tremuloides | Moderate | 5,000–10,000 ft | 8 | 60 ft × 25 ft |
Common hackberry | Celtis occidentalis | Low–moderate | Up to 7,000 ft | 4 | 60 ft × 45 ft |
Kentucky coffeetree | Gymnocladus dioicus | Moderate | Lower Front Range | 4 | 70 ft × 45 ft |
Bur oak | Quercus macrocarpa | Moderate | Lower Front Range | 4 | 70 ft × 60 ft |
Sources & References:
Climate Change, Planting Zones, and Forest Movement
Colorado State Forest Service. “Colorado’s Forests in a Changing Climate.” Information about warming temperatures, drought, wildfire, insects, disease, and the changing conditions affecting Colorado forests.https://csfs.colostate.edu/science/colorados-forests-changing-climate/
Colorado State Forest Service. “Hardwood: Primarily Aspen.” Information about quaking aspen, sudden aspen decline, drought, warmer temperatures, elevation, and forest health.https://csfs.colostate.edu/forests-trees/forest-types/aspen/
Nigro, Katherine M., Monique E. Rocca, Michael A. Battaglia, Jonathan D. Coop, and Miranda D. Redmond. “Wildfire Catalyzes Upward Range Expansion of Trembling Aspen in Southern Rocky Mountain Beetle-Killed Forests.” U.S. Forest Service Research and Development, 2022. Research supporting the discussion of aspen seedlings establishing farther upslope following wildfire.https://research.fs.usda.gov/treesearch/64182
U.S. Geological Survey. “Past and Ongoing Shifts in Joshua Tree Distribution Support Future Modeled Range Contraction.” Research about changing Joshua tree distribution and future habitat suitability under a warming climate.https://pubs.usgs.gov/publication/70034093
U.S. Forest Service, Rocky Mountain Research Station. “Climate Change in Grasslands, Shrublands, and Deserts of the Interior American West.” Research supporting projected northward and upslope movement of suitable pinyon-juniper habitat and other Southwestern vegetation.https://research.fs.usda.gov/download/treesearch/41185.pdf
Yale Environment 360. “With Hotter, Drier Weather, California’s Joshua Trees Are in Trouble.” Background information and photography related to Joshua trees and climate-driven habitat changes.https://e360.yale.edu/features/joshua-trees-climate-change
USDA Agricultural Research Service. “How to Use the USDA Plant Hardiness Zone Maps.” Explanation of USDA hardiness zones and how the maps should be used when selecting plants.https://planthardiness.ars.usda.gov/pages/how-to-use-the-maps
Colorado State University Extension. “Colorado Mountain Gardening Basics.” Information about elevation, intense sunlight, low humidity, short growing seasons, drying winds, slopes, soils, and Colorado mountain microclimates.https://extension.colostate.edu/resource/colorado-mountain-gardening-basics/
Soil Health, Carbon, Water, and Flood Resilience
USDA Climate Hubs. “Soil Health, Soil Amendments, and Carbon Farming.” Information about carbon farming, soil carbon, compost, biochar, plant material, and storing atmospheric carbon in soil.https://www.climatehubs.usda.gov/hubs/california/topic/soil-health-soil-amendments-and-carbon-farming
USDA Climate Hubs. “Maintain and Improve Soil Health.” Information about organic matter, carbon sequestration, water-holding capacity, infiltration, erosion reduction, and soil resilience.https://www.climatehubs.usda.gov/approach/maintain-and-improve-soil-health
Colorado State University Extension. “Water-Wise Landscape Design: Steps.” Guidance on hydrozoning, grouping plants by water requirements, irrigation efficiency, and designing climate-appropriate landscapes.https://extension.colostate.edu/resource/water-wise-landscape-design-steps/
Colorado State University Extension. “Soil Erosion Control After Wildfire.” Information about post-fire erosion, water-repellent soil, runoff, rainfall, vegetation loss, plant roots, and soil stabilization.https://extension.colostate.edu/resource/soil-erosion-control-after-wildfire/
Firewise Landscaping and Defensible Space
Colorado State Forest Service. “Protect Your Home & Property from Wildfire.” Colorado guidance for defensible space, the home ignition zone, noncombustible space, vegetation management, and the three mitigation zones.https://csfs.colostate.edu/wildfire-mitigation/protect-your-home-property-from-wildfire/
Colorado State University Extension. “Firewise Plant Materials.” Primary Colorado source for ignition ratings, plant characteristics, elevation, water needs, sunlight, mature size, placement, and maintenance recommendations.https://extension.colostate.edu/resource/firewise-plant-materials/
Idaho Firewise. “Fire Resistance of Plants Master Database.” Supplemental plant-index database used for additional numerical ratings, plant categories, mature sizes, and suggested distances from structures.https://idahofirewise.org/wp-content/uploads/2017/04/FireXResistanceXofXPlantsXMasterXDatabase.pdf
Oregon State University Extension Service. “Fire-Resistant Plants for Home Landscapes.” Supplemental guidance about plant flammability, groundcovers, perennials, shrubs, broadleaf evergreens, trees, spacing, maintenance, and fuel continuity.https://extension.oregonstate.edu/catalog/pnw-590-fire-resistant-plants-home-landscapes
Colorado Plant Selection and Growing Requirements
Colorado State University Extension. “Native Herbaceous Perennials for Colorado Landscapes.” Colorado-specific information about native perennials, elevations, moisture requirements, mature sizes, and growing conditions.https://extension.colostate.edu/resource/native-herbaceous-perennials-for-colorado-landscapes/
Colorado State University Extension. “Ground Covers and Rock Garden Plants for Mountain Communities.” Information about mature sizes, elevation tolerance, sunlight, moisture, and Colorado mountain groundcovers.https://extension.colostate.edu/resource/ground-covers-and-rock-garden-plants-for-mountain-communities/
Colorado State University Extension. “Native Shrubs for Colorado Landscapes.” Colorado-specific information about native shrubs, life zones, elevation, moisture requirements, mature sizes, and growth habits.https://extension.colostate.edu/resource/native-shrubs-for-colorado-landscapes/
Colorado State University Extension. “Trees and Shrubs for Mountain Areas.” Information about tree and shrub selection, elevation, moisture requirements, exposure, mature size, and Colorado mountain conditions.https://extension.colostate.edu/resource/trees-and-shrubs-for-mountain-areas/
Colorado State University Extension. “Xeriscaping: Trees and Shrubs.” Supplemental information about water requirements, mature sizes, and trees and shrubs adapted to Colorado’s climate.https://extension.colostate.edu/resource/xeriscaping-trees-and-shrubs/
Plant Select. “CORONADO® Red Hyssop.” Plant-specific information about Coronado Red hyssop, including sunlight, water needs, mature size, and recommended growing conditions.https://plantselect.org/plant/agastache-pstessene/
Photo and Image Sources
Yale Environment 360. Joshua Tree Photograph. Photo by Michael Faist, National Park Service, presented through Yale Environment 360.https://e360.yale.edu/features/joshua-trees-climate-change
Pixabay. Image source for the yarrow, Rocky Mountain columbine, butterfly weed, stonecrop, wild strawberry, poppy mallow, mock orange, lilac, serviceberry, aspen, chokecherry, and maple photographs used throughout the article.https://pixabay.com/
Pixabay Content License Summary. Terms governing the use and attribution of Pixabay photographs.https://pixabay.com/service/license-summary/
Next Generation Landscapers. Original project photography showing defensible-space zones, noncombustible materials, tree spacing, and thoughtfully placed vegetation.https://www.nextgenerationlandscapers.com/
Sources accessed July 30, 2026. Plant ratings, recommendations, growing ranges, and online resources may be revised over time. Always review the current Colorado State University Firewise Plant Materials guidance before making long term plant-selection or placement decisions.
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