Garrison, MT frost dates

Gardening where frost is possible all year

The weather station nearest Garrison, MT 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 Deer Lodge 3 W, MT weather station, 23 km away (elevation 4,849 ft (1,478 m)).

Frost dates near Garrison

• Avon Jun 9 · Sep 8
• Gold Creek frost any month
• Deer Lodge frost any month
• Helmville frost any month
• Elliston Jun 9 · Sep 8
• Hall frost any month
• Drummond frost any month
• Marysville Jun 4 · Sep 14
• Lincoln frost any month
• Canyon Creek Jun 4 · Sep 14

Frequently asked questions

When is the last frost in Garrison, MT?

Garrison, MT can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 231 nights a year at or below 32°F.

What can I grow in Garrison, MT?

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.