Colorado · West
Boulder, CO
Zone-aware planting reference for Boulder. Population 106,803; USDA hardiness zone 6a; nearest curated zip code 80310.
- USDA zone
- 6a
- Population
- 106,803
- Last spring frost
- 06/21
- First fall frost
- 09/02
- Growing season
- 71 days
- Nearest zip
- 80310
Local timing baseline
Detailed guidance for this section is being prepared. Check back soon.
Crops suited to Boulder
Crops whose USDA zone range includes zone 6a. 87 crops match.
Tree fruit
12 crops
Berries
20 crops
zone 6a Aronia (Black Chokeberry)
Aronia melanocarpa
zones 3a–8a
zone 6a Black Currant
Ribes nigrum
zones 3a–7a
zone 6a Black Raspberry
Rubus occidentalis
zones 4a–8a
zone 6a Blackberry
Rubus subgenus Rubus
zones 5a–9a
zone 6a Cranberry
Vaccinium macrocarpon
zones 3a–7a
zone 6a Elderberry
Sambucus canadensis
zones 3b–9a
Nuts
6 crops
Vegetables
40 crops
zone 6a Arugula
Eruca vesicaria
zones 3b–9a
zone 6a Asparagus
Asparagus officinalis
zones 3b–8b
zone 6a Beet
Beta vulgaris
zones 3a–9a
zone 6a Broccoli
Brassica oleracea var. italica
zones 3a–9a
zone 6a Brussels Sprouts
Brassica oleracea var. gemmifera
zones 3b–8a
zone 6a Bush Bean
Phaseolus vulgaris
zones 3b–9a
Herbs
9 crops
Other cities in Colorado
Frequently asked questions
- What USDA zone is Boulder, CO?
Boulder sits in USDA hardiness zone 6a, based on the nearest zip code (80310).
- When are the average last and first frost dates in Boulder?
Based on the nearest weather station, Boulder averages a last spring frost around 06/21 and a first fall frost around 09/02, for a growing season of about 71 days.
- What crops grow well in Boulder?
87 crops in the ZonePlant database have a recommended USDA zone range that includes zone 6a. Tree fruit, berries, and most common vegetables are well-suited; check each crop page for variety-level guidance.
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