De Borgia, MT frost dates
Last spring frostAny monthno frost-free season
Freezing nights215 / yrat or below 32°F
Hardiness zone6aZone 6a
Gardening where frost is possible all year
The weather station nearest De Borgia, 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.
How De Borgia compares
- Nearby Missoula, MT, 115 km away, has a regular frost season (last frost May 10), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Haugan 1 W, MT weather station, 6 km away (elevation 3,159 ft (963 m)).
Frost dates near De Borgia
- Haugan frost any month
- Saltese frost any month
- Saint Regis frost any month
- Thompson Falls May 7 · Oct 4
- Plains frost any month
- Paradise May 17 · Sep 23
- Superior May 17 · Sep 23
- Trout Creek May 20 · Sep 21
- Hot Springs May 15 · Sep 28
- Lonepine May 15 · Sep 28
Frequently asked questions
When is the last frost in De Borgia, MT?
De Borgia, MT can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 215 nights a year at or below 32°F.
What can I grow in De Borgia, 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.