Silverthorne, CO frost dates
Last spring frostAny monthno frost-free season
Freezing nights274 / yrat or below 32°F
Hardiness zone4bZone 4b
Gardening where frost is possible all year
The weather station nearest Silverthorne, CO 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 Silverthorne compares
- Nearby Boulder, CO, 82 km away, has a regular frost season (last frost May 6), a reminder of how much elevation and distance from the coast matter.
About these dates
Based on 1991–2020 NOAA climate normals for the Dillon 1 E, CO weather station, 14 km away (elevation 9,065 ft (2,763 m)).
ZIP codes in Silverthorne: 80497 80498
Frost dates near Silverthorne
- Frisco frost any month
- Dillon frost any month
- Vail Jun 21 · Sep 7
- Minturn Jun 21 · Sep 7
- Red Cliff Jun 21 · Sep 7
- Breckenridge frost any month
- Parshall Jun 12 · Sep 10
- Avon Jun 21 · Sep 7
- Silver Plume May 30 · Sep 19
- Winter Park frost any month
Frequently asked questions
When is the last frost in Silverthorne, CO?
Silverthorne, CO can freeze in any month, so there is no reliable last frost date. The nearest NOAA station averages 274 nights a year at or below 32°F.
What can I grow in Silverthorne, CO?
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.