Coalmont, CO frost dates
Last spring frostAny monthno frost-free season
Freezing nights253 / yrat or below 32°F
Hardiness zone4bZone 4b
Gardening where frost is possible all year
The weather station nearest Coalmont, CO records freezing temperatures in every month often enough that NOAA cannot define a frost-free season. Gardening is still possible — it just means planning for frost at any time:
- Grow fast, cold-tolerant crops: Radishes, Lettuce, Spinach, Kale, Peas, Potatoes, Swiss Chard, Garlic.
- Plant once the soil can be worked — usually late spring to early summer at high elevation — and keep row covers ready for clear, still nights.
- Use season extension: cold frames, low tunnels, wall-of-water cloches or a greenhouse turn a few frost-free weeks into a real season.
- Frost-tender crops (tomatoes, squash, beans) need protection all season; choose the earliest varieties you can find.
How Coalmont compares
- Nearby Boulder, CO, 118 km away, has a regular frost season (last frost May 6), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Spicer, CO weather station, 10 km away (elevation 8,386 ft (2,556 m)).
Frost dates near Coalmont
- Walden frost any month
- Steamboat Springs Jun 9 · Sep 12
- Rand frost any month
- Clark Jun 9 · Sep 12
- Cowdrey frost any month
- Oak Creek Jun 14 · Sep 11
- Phippsburg Jun 14 · Sep 11
- Kremmling Jun 14 · Sep 5
- Yampa Jun 14 · Sep 11
- Toponas Jun 14 · Sep 11
Frequently asked questions
When is the last frost in Coalmont, CO?
Coalmont, CO can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 253 nights a year at or below 32°F.
What can I grow in Coalmont, CO?
Fast, cold-tolerant crops such as radishes, lettuce, spinach, kale, peas and potatoes, ideally under row covers, cold frames or a greenhouse. Frost-tender crops like tomatoes need protection all season.