Conner, MT frost dates
Last spring frostAny monthno frost-free season
Freezing nights230 / yrat or below 32°F
Hardiness zone5bZone 5b
Gardening where frost is possible all year
The weather station nearest Conner, 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 Conner compares
- Nearby Missoula, MT, 107 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 Sula 3 Ene, MT weather station, 13 km away (elevation 4,475 ft (1,364 m)).
Frost dates near Conner
- Darby May 24 · Sep 23
- Sula frost any month
- Grantsdale May 21 · Sep 22
- Hamilton May 21 · Sep 22
- Corvallis May 23 · Sep 21
- Pinesdale May 21 · Sep 22
- Victor May 23 · Sep 21
- Wisdom frost any month
- Stevensville May 22 · Sep 19
- Philipsburg frost any month
Frequently asked questions
When is the last frost in Conner, MT?
Conner, MT can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 230 nights a year at or below 32°F.
What can I grow in Conner, 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.