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Will it freeze in Sheridan in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 29°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 29°F. 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 29°F Freeze · Mostly Cloudy
- Fri, Nov 6 27°F Hard freeze · Mostly Clear
- Sat, Nov 7 30°F Freeze · Mostly Clear
- Sun, Nov 8 31°F Freeze · Partly Cloudy
- Mon, Nov 9 30°F Freeze · Partly Cloudy
- Tue, Nov 10 32°F Freeze · Mostly Clear
- Wed, Nov 11 32°F Freeze · Partly Cloudy
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 Sheridan
The median first fall hard-freeze date (28°F) is October 3, from NOAA’s 1991–2020 Climate Normals at Sheridan County Airport. 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 21 · Jun 4 · Jun 19 | Aug 30 · Sep 13 · Sep 25 | 98 days |
| 32°F freeze | May 7 · May 21 · Jun 6 | Sep 9 · Sep 23 · Oct 6 | 123 days |
| 28°F hard freeze | Apr 25 · May 7 · May 22 | Sep 20 · Oct 3 · Oct 17 | 147 days |
Average high temperature by month
1991–2020 normals at Sheridan County Airport
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 Sheridan, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Sheridan County Airport (station USW00024029, elevation 3,945 ft), 1.9 mi from Sheridan. 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 Sheridan
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Gillette, WY | 81 mi | May 15 | Oct 1 |
| Powell, WY | 88 mi | May 19 | Sep 20 |
| Billings, MT | 103 mi | May 4 | Oct 7 |
| Cody, WY | 104 mi | May 12 | Oct 1 |
| Laurel, MT | 107 mi | May 5 | Oct 3 |
| Miles City, MT | 124 mi | May 8 | Sep 30 |
| Casper, WY | 139 mi | May 10 | Sep 29 |
| Riverton, WY | 141 mi | May 12 | Sep 24 |
| Belle Fourche, SD | 153 mi | May 10 | Sep 30 |
| Spearfish, SD | 156 mi | May 12 | Oct 2 |
Frequently asked questions
When is the last frost in Sheridan?
On average, the last spring frost (32°F) in Sheridan is around May 21. In about 1 year in 10 it comes after June 6, and in 9 years in 10 it comes after May 7.
When is the first frost in Sheridan?
The first fall frost (32°F) usually arrives around September 23. There’s a 10% chance of a freeze by September 9 and a 90% chance by October 6.
Can it frost in Sheridan 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 4.
What growing zone is Sheridan?
Sheridan 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 82801. See growing zones in Wyoming.
More: all Wyoming frost dates · Wyoming growing zones · frost vs. freeze