Yellowstone National Park, WY frost dates

Gardening where frost is possible all year

The weather station nearest Yellowstone National Park, 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 Tower Falls, WY weather station, 20 km away (elevation 6,276 ft (1,913 m)).

Frost dates near Yellowstone National Park

• Moran frost any month
• Wapiti May 27 · Sep 25
• Alta Jun 14 · Sep 11
• Moose Jun 24 · Aug 28
• Cody May 12 · Oct 1
• Kelly Jun 24 · Aug 28
• Teton Village Jun 20 · Aug 31
• Ralston May 15 · Sep 25
• Powell May 19 · Sep 20
• Wilson frost any month

Frequently asked questions

When is the last frost in Yellowstone National Park, WY?

Yellowstone National Park, WY can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 265 nights a year at or below 32°F.

What can I grow in Yellowstone National Park, 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.