Checking current alerts… View NWS forecast and alerts.
Will it freeze in Aspen in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 28°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 28°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 28°F Hard freeze · Mostly Cloudy
- Fri, Nov 6 26°F Hard freeze · Mostly Clear
- Sat, Nov 7 28°F Hard freeze · Mostly Clear
- Sun, Nov 8 31°F Freeze · Clear
- Mon, Nov 9 32°F Freeze · Mostly Clear
- Tue, Nov 10 31°F Freeze · Partly Cloudy
- Wed, Nov 11 32°F 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 Aspen
The median first fall hard-freeze date (28°F) is October 1, from NOAA’s 1991–2020 Climate Normals at Aspen 1SW. 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 | Jun 3 · Jun 16 · Jul 1 | Sep 1 · Sep 14 · Sep 25 | 89 days |
| 32°F freeze | May 17 · Jun 2 · Jun 17 | Sep 12 · Sep 23 · Oct 4 | 113 days |
| 28°F hard freeze | May 3 · May 18 · Jun 5 | Sep 18 · Oct 1 · Oct 16 | 135 days |
Average high temperature by month
1991–2020 normals at Aspen 1SW
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 Aspen, CO come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Aspen 1SW (station USC00050372, elevation 8,175 ft), 0.7 mi from Aspen. 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 Aspen
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Carbondale, CO | 24 mi | May 13 | Oct 3 |
| Gypsum, CO | 30 mi | May 1 | Oct 14 |
| Eagle, CO | 31 mi | May 1 | Oct 14 |
| Avon, CO | 35 mi | Jun 21 | Sep 7 |
| Glenwood Springs, CO | 36 mi | May 13 | Oct 3 |
| Gunnison, CO | 45 mi | Jun 21 | Sep 5 |
| Breckenridge, CO | 47 mi | Jun 21 | Sep 7 |
| Silverthorne, CO | 51 mi | Jun 21 | Sep 7 |
| Rifle, CO | 55 mi | May 11 | Oct 4 |
| Salida, CO | 65 mi | May 29 | Sep 20 |
Frequently asked questions
When is the last frost in Aspen?
On average, the last spring frost (32°F) in Aspen is around June 2. In about 1 year in 10 it comes after June 17, and in 9 years in 10 it comes after May 17.
When is the first frost in Aspen?
The first fall frost (32°F) usually arrives around September 23. There’s a 10% chance of a freeze by September 12 and a 90% chance by October 4.
Can it frost in Aspen after the last frost date?
Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after June 16.
What growing zone is Aspen?
Aspen is in USDA Plant Hardiness Zone 5b (average annual extreme minimum temperature −15 to −10°F), based on the 2023 USDA map for ZIP code 81615. See growing zones in Colorado.
More: all Colorado frost dates · Colorado growing zones · frost vs. freeze