Troy, ID frost dates
Last spring frostAny monthno frost-free season
Freezing nights139 / yrat or below 32°F
Hardiness zone6bZone 6b
Gardening where frost is possible all year
The weather station nearest Troy, ID 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 Troy compares
- Nearby Spokane, WA, 113 km away, has a regular frost season (last frost Apr 26), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Moscow U Of I, ID weather station, 14 km away (elevation 2,661 ft (811 m)).
Frost dates near Troy
- Moscow frost any month
- Kendrick Apr 20 · Oct 20
- Princeton May 15 · Sep 21
- Juliaetta frost any month
- Deary May 16 · Sep 23
- Viola May 15 · Sep 21
- Harvard May 15 · Sep 21
- Genesee frost any month
- Potlatch May 15 · Sep 21
- Lenore Apr 20 · Oct 20
Frequently asked questions
When is the last frost in Troy, ID?
Troy, ID can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 139 nights a year at or below 32°F.
What can I grow in Troy, ID?
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.