Island Park, ID frost dates
Last spring frostAny monthno frost-free season
Freezing nights247 / yrat or below 32°F
Hardiness zone4aZone 4a
Gardening where frost is possible all year
The weather station nearest Island Park, 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 Island Park compares
- Nearby Idaho Falls, ID, 118 km away, has a regular frost season (last frost May 9), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Island Park, ID weather station, 3 km away (elevation 6,289 ft (1,917 m)).
Frost dates near Island Park
- Macks Inn frost any month
- Ashton May 21 · Sep 21
- Chester May 21 · Sep 21
- Saint Anthony May 17 · Sep 22
- Parker May 17 · Sep 22
- Newdale May 17 · Sep 22
- Felt Jun 15 · Sep 7
- Spencer May 18 · Sep 30
- Teton May 29 · Sep 13
- Sugar City May 29 · Sep 13
Frequently asked questions
When is the last frost in Island Park, ID?
Island Park, ID can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 247 nights a year at or below 32°F.
What can I grow in Island Park, 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.