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Will it freeze in Silverthorne in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 23°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 23°F. Hard freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 23°F Hard freeze · Mostly Cloudy
- Fri, Nov 6 20°F Hard freeze · Slight Chance Snow Showers then Partly Cloudy
- Sat, Nov 7 21°F Hard freeze · Mostly Clear
- Sun, Nov 8 24°F Hard freeze · Clear
- Mon, Nov 9 26°F Hard freeze · Mostly Clear
- Tue, Nov 10 25°F Hard freeze · Partly Cloudy
- Wed, Nov 11 24°F Hard freeze · Mostly Clear
Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.
Frost and freeze probabilities
Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.
These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.
Average first hard freeze in Silverthorne
The median first fall hard-freeze date (28°F) is September 21, from NOAA’s 1991–2020 Climate Normals at Vail. This is the 50% probability date, not a forecast for this year.
| Temperature | Last spring date 90% · 50% · 10% chance of a later freeze | First fall date 10% · 50% · 90% chance of an earlier freeze | Season |
|---|---|---|---|
| 36°F frost possible | rare in most years | rare in most years | 40 days |
| 32°F freeze | Jun 8 · Jun 21 · Jul 9 | Aug 26 · Sep 7 · Sep 20 | 77 days |
| 28°F hard freeze | May 16 · May 31 · Jun 18 | Sep 7 · Sep 21 · Oct 2 | 109 days |
Average high temperature by month
1991–2020 normals at Vail
Average low temperature by month
Months with lows near or below freezing carry frost risk
Where these frost dates come from
The frost dates for Silverthorne, CO come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Vail (station USC00058575, elevation 8,304 ft), 14 mi from Silverthorne. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.
Frost dates near Silverthorne
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Breckenridge, CO | 11 mi | Jun 21 | Sep 7 |
| Avon, CO | 23 mi | Jun 21 | Sep 7 |
| Eagle, CO | 39 mi | May 1 | Oct 14 |
| Gypsum, CO | 46 mi | May 1 | Oct 14 |
| Golden, CO | 47 mi | May 3 | Oct 7 |
| Boulder, CO | 51 mi | May 6 | Oct 5 |
| Aspen, CO | 51 mi | Jun 2 | Sep 23 |
| Arvada, CO | 52 mi | May 5 | Oct 5 |
| Lakewood, CO | 52 mi | May 3 | Oct 7 |
| Superior, CO | 53 mi | May 6 | Oct 5 |
Frequently asked questions
When is the last frost in Silverthorne?
On average, the last spring frost (32°F) in Silverthorne is around June 21. In about 1 year in 10 it comes after July 9, and in 9 years in 10 it comes after June 8.
When is the first frost in Silverthorne?
The first fall frost (32°F) usually arrives around September 7. There’s a 10% chance of a freeze by August 26 and a 90% chance by September 20.
What growing zone is Silverthorne?
Silverthorne is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 80435. See growing zones in Colorado.
More: all Colorado frost dates · Colorado growing zones · frost vs. freeze