Jelm, WY frost dates
Last spring frostAny monthno frost-free season
Freezing nights253 / yrat or below 32°F
Hardiness zone5aZone 5a
Gardening where frost is possible all year
The weather station nearest Jelm, WY 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 Jelm compares
- Nearby Fort Collins, CO, 96 km away, has a regular frost season (last frost May 2), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Hohnholz Rch, CO weather station, 10 km away (elevation 7,799 ft (2,377 m)).
Frost dates near Jelm
- Centennial Jun 2 · Sep 19
- Tie Siding May 31 · Sep 19
- Laramie Jun 7 · Sep 4
- Buford May 27 · Sep 19
- Encampment Jun 2 · Sep 12
- Bosler Jun 7 · Sep 4
- Granite Canon May 31 · Sep 19
- Rock River Jun 1 · Sep 8
- Elk Mountain May 28 · Sep 13
- Saratoga Jun 12 · Sep 7
Frequently asked questions
When is the last frost in Jelm, WY?
Jelm, WY 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 Jelm, WY?
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.