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Will it freeze in Cheyenne in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Sat, Nov 7: 32°F (Sat, Nov 7, 6:00 PM MST to Sun, Nov 8, 6:00 AM MST).
Tonight: forecast low 33°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 33°F Frost possible · Mostly Cloudy
- Fri, Nov 6 34°F Frost possible · Mostly Clear
- Sat, Nov 7 32°F Freeze · Mostly Clear
- Sun, Nov 8 39°F Above 36°F · Mostly Clear
- Mon, Nov 9 36°F Frost possible · Partly Cloudy
- Tue, Nov 10 37°F Above 36°F · Partly Cloudy
- Wed, Nov 11 37°F Above 36°F · 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 Cheyenne
The median first fall hard-freeze date (28°F) is October 10, from NOAA’s 1991–2020 Climate Normals at Cheyenne WFO. 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 | May 13 · May 26 · Jun 7 | Sep 11 · Sep 24 · Oct 5 | 120 days |
| 32°F freeze | May 3 · May 14 · May 28 | Sep 17 · Oct 1 · Oct 14 | 139 days |
| 28°F hard freeze | Apr 20 · May 3 · May 17 | Sep 27 · Oct 10 · Oct 23 | 157 days |
Average high temperature by month
1991–2020 normals at Cheyenne WFO
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 Cheyenne, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Cheyenne WFO (station USC00481676, elevation 6,119 ft), 1.7 mi from Cheyenne. 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 Cheyenne
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Wellington, CO | 32 mi | May 3 | Oct 6 |
| Timnath, CO | 42 mi | May 3 | Oct 6 |
| Eaton, CO | 42 mi | May 2 | Oct 8 |
| Fort Collins, CO | 42 mi | May 2 | Oct 7 |
| Severance, CO | 43 mi | May 3 | Oct 6 |
| Laramie, WY | 44 mi | Jun 7 | Sep 4 |
| Windsor, CO | 45 mi | May 3 | Oct 6 |
| Greeley, CO | 49 mi | May 2 | Oct 8 |
| Loveland, CO | 51 mi | May 10 | Oct 1 |
| Evans, CO | 54 mi | May 2 | Oct 8 |
Frequently asked questions
When is the last frost in Cheyenne?
On average, the last spring frost (32°F) in Cheyenne is around May 14. In about 1 year in 10 it comes after May 28, and in 9 years in 10 it comes after May 3.
When is the first frost in Cheyenne?
The first fall frost (32°F) usually arrives around October 1. There’s a 10% chance of a freeze by September 17 and a 90% chance by October 14.
Can it frost in Cheyenne 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 May 26.
What growing zone is Cheyenne?
Cheyenne 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 82005. See growing zones in Wyoming.
More: all Wyoming frost dates · Wyoming growing zones · UV index today in Cheyenne · frost vs. freeze