Opal, WY frost dates

Gardening where frost is possible all year

The weather station nearest Opal, 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.

About these dates

Based on 1991–2020 NOAA climate normals for the Kemmerer 2n, WY weather station, 22 km away (elevation 6,936 ft (2,114 m)).

Frost dates near Opal

• Kemmerer frost any month
• Diamondville frost any month
• Frontier frost any month
• Granger May 25 · Sep 27
• Little America May 25 · Sep 27
• Lyman Jun 14 · Sep 9
• Fort Bridger Jun 14 · Sep 9
• La Barge Jun 9 · Sep 4
• Mountain View Jun 14 · Sep 9
• Cokeville frost any month

Frequently asked questions

When is the last frost in Opal, WY?

Opal, WY can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 246 nights a year at or below 32°F.

What can I grow in Opal, 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.