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Will it freeze in Gillette in the next 7 nights?
No overnight lows at or below 32°F are forecast in Gillette during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 34°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 34°F Frost possible · Partly Cloudy
- Fri, Nov 6 33°F Frost possible · Mostly Clear
- Sat, Nov 7 36°F Frost possible · Mostly Clear
- Sun, Nov 8 37°F Above 36°F · Mostly Clear
- Mon, Nov 9 37°F Above 36°F · Partly Cloudy
- Tue, Nov 10 37°F Above 36°F · Mostly Clear
- Wed, Nov 11 40°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 Gillette
The median first fall hard-freeze date (28°F) is October 10, from NOAA’s 1991–2020 Climate Normals at Gillette 4SE. 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 14 · May 28 · Jun 12 | Sep 6 · Sep 21 · Oct 3 | 114 days |
| 32°F freeze | May 1 · May 15 · May 27 | Sep 15 · Oct 1 · Oct 14 | 136 days |
| 28°F hard freeze | Apr 18 · May 2 · May 15 | Sep 26 · Oct 10 · Oct 23 | 159 days |
Average high temperature by month
1991–2020 normals at Gillette 4SE
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 Gillette, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Gillette 4SE (station USC00483855, elevation 4,640 ft), 2.5 mi from Gillette. 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 Gillette
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Sheridan, WY | 81 mi | May 21 | Sep 23 |
| Spearfish, SD | 85 mi | May 12 | Oct 2 |
| Belle Fourche, SD | 85 mi | May 10 | Sep 30 |
| Sturgis, SD | 99 mi | May 8 | Oct 3 |
| Douglas, WY | 105 mi | May 19 | Sep 23 |
| Casper, WY | 107 mi | May 10 | Sep 29 |
| Rapid City, SD | 114 mi | May 3 | Oct 8 |
| Box Elder, SD | 121 mi | May 12 | Oct 1 |
| Miles City, MT | 149 mi | May 8 | Sep 30 |
| Torrington, WY | 167 mi | May 11 | Sep 29 |
Frequently asked questions
When is the last frost in Gillette?
On average, the last spring frost (32°F) in Gillette is around May 15. In about 1 year in 10 it comes after May 27, and in 9 years in 10 it comes after May 1.
When is the first frost in Gillette?
The first fall frost (32°F) usually arrives around October 1. There’s a 10% chance of a freeze by September 15 and a 90% chance by October 14.
Can it frost in Gillette 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 28.
What growing zone is Gillette?
Gillette is in USDA Plant Hardiness Zone 4b (average annual extreme minimum temperature −25 to −20°F), based on the 2023 USDA map for ZIP code 82727. See growing zones in Wyoming.
More: all Wyoming frost dates · Wyoming growing zones · UV index today in Gillette · frost vs. freeze