Best plants for Fort Collins gardens
Fort Collins gardens sit at about 5,000 ft in USDA zone 5b on heavy alkaline clay, with roughly 15 inches of annual precipitation and an erratic last frost around May 11. The two defining issues are an exploding emerald ash borer infestation and one of the region's best turf rebates — so the plants below favor diverse, non-ash, water-wise species.
Last updated 2026-05-30
Fort Collins growing conditions
- USDA hardiness zone
- 5b (6a in sheltered urban pockets)
- Elevation
- 5,003 ft
- Avg. annual precipitation
- ~15 in
- Soil
- heavy, compacted alkaline clay
- Avg. last spring frost
- ~May 11
- Avg. first fall frost
- early-to-mid October
- Growing season
- ~146 days
Fort Collins sits at ~5,000 ft in zone 5b with a soil-amendment ordinance reflecting its heavy, compacted clay. Late frosts are erratic — there's roughly a 30% chance of 28°F after May 15 — and foothills neighborhoods on the west side run cooler and windier with deer pressure.
What's challenging in Fort Collins
Emerald ash borer is spreading fast
EAB was first found in Larimer County in 2019 and was well within Fort Collins city limits by 2024, where its population is expanding rapidly. If you have an ash tree (genus Fraxinus), consult a certified arborist about treatment versus replacement, and don't plant new ash — the diverse trees below are good EAB-proof alternatives. (source)
Erratic late frosts
Fort Collins has roughly a 30% chance of a 28°F freeze after May 15, so even though the average last frost is ~May 11, hold tender plants until the soil is reliably warm.
Top trees for Fort Collins
Ranked for Fort Collins's hail, drying wind, late frosts and cold and low water use.
Juniper — One – SeedJuniperus monosperma
Juniper — Rocky MountainJuniperus scopulorum
Pine — 'Vanderwolf's Pyramid'Pinus flexilis
Pine — Bristlecone(foxtail)Pinus aristata
Douglas-fir — Rocky Mountain Douglas firPseudotsuga menziesii var. glauca
Fir — WhiteAbies concolor
Spruce — ColoradoPicea pungens
Spruce — Colorado Blue – BABY BLUE®, 'Baby Blue Eyes', 'Bakeri', 'Fastigiata', 'Fat Albert', 'Hoopsi', 'Colorado Weeping', 'Sester Dwarf'Picea pungens glauca
Top shrubs for Fort Collins
Ranked for Fort Collins's hail, drying wind, late frosts and cold and low water use.
Top perennials for Fort Collins
Ranked for Fort Collins's hail, drying wind, late frosts and cold and low water use.
Top groundcover for Fort Collins
Ranked for Fort Collins's hail, drying wind, late frosts and cold and low water use.
Rebates & water rules in Fort Collins
Fort Collins Utilities water customers; pre-approval required before installation
Fort Collins Utilities customers
Watering rules: Fort Collins has a Xeriscape & Soil Amendment ordinance for new landscapes; watering guidance is typically ≤3 days/week, avoiding 10 a.m.–6 p.m. Some areas are served by separate districts (e.g., FCLWD) with their own rules — check your provider. current rules →
Statewide: new Colorado turf rules (SB24-005/HB25-1113) limit nonfunctional turf in new development, and HOAs can't ban xeriscaping (SB23-178). Read the statewide rules →
Local resources near Fort Collins
- Botanic garden
The Gardens on Spring Creek — Fort Collins's 18-acre community botanic garden — demonstration beds, classes, and events. - Demonstration garden
CSU Annual Flower Trial Garden — 1,200+ varieties trialed under Colorado conditions; free to visit. - Extension
CSU Extension — Larimer County Master Gardeners / Native Plant Master — Master Gardener help desk plus a Native Plant Master class program. - Native plant society
Colorado Native Plant Society — Northern Chapter — The most active chapter for Fort Collins and Loveland.
When to plant in Fort Collins
Plant trees, shrubs, and perennials in spring (late April–May) or early fall. Amend the heavy clay with compost, and don't plant tender annuals until the soil warms in late May given erratic late frosts. In Larimer County's heavy clay, work compost in before planting and wait out the erratic May frosts.
Video
📺 PlantTalk Colorado: tree planting & care (CSU Extension, based in Fort Collins)
Fort Collins gardening FAQ
- What hardiness zone is Fort Collins?
- Fort Collins is USDA zone 5b, with warmer 6a pockets in sheltered urban areas.
- When is the last frost in Fort Collins?
- The average last spring frost is around May 11, but there's roughly a 30% chance of a 28°F freeze after May 15 — wait for warm soil before planting tender annuals.
- Is there a turf rebate in Fort Collins?
- Yes — Fort Collins Utilities' Xeriscape Incentive Program (XIP) pays $0.75/sq ft (up to $750), plus a $0.25/sq ft native-plant bonus for up to $1,000 total. Pre-approval is required before you install. Verify current terms with Fort Collins Utilities.
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