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Will it freeze in Powell in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 32°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 32°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 32°F Freeze · Mostly Cloudy
- Fri, Nov 6 30°F Freeze · Mostly Clear
- Sat, Nov 7 33°F Frost possible · Mostly Clear
- Sun, Nov 8 36°F Frost possible · Mostly Cloudy
- Mon, Nov 9 35°F Frost possible · Mostly Cloudy
- Tue, Nov 10 35°F Frost possible · Mostly Clear
- Wed, Nov 11 35°F Frost possible · 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 Powell
The median first fall hard-freeze date (28°F) is September 29, from NOAA’s 1991–2020 Climate Normals at Powell Field Station. 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 | 94 days |
| 32°F freeze | May 5 · May 19 · Jun 4 | Sep 7 · Sep 20 · Oct 1 | 123 days |
| 28°F hard freeze | Apr 25 · May 5 · May 20 | Sep 16 · Sep 29 · Oct 14 | 146 days |
Average high temperature by month
1991–2020 normals at Powell Field Station
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 Powell, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Powell Field Station (station USC00487388, elevation 4,372 ft), 1.0 mi from Powell. 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 Powell
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Cody, WY | 22 mi | May 12 | Oct 1 |
| Laurel, MT | 63 mi | May 5 | Oct 3 |
| Billings, MT | 71 mi | May 4 | Oct 7 |
| Sheridan, WY | 88 mi | May 21 | Sep 23 |
| Livingston, MT | 107 mi | May 27 | Sep 14 |
| Riverton, WY | 121 mi | May 12 | Sep 24 |
| Bozeman, MT | 129 mi | May 26 | Sep 22 |
| Lander, WY | 134 mi | May 18 | Sep 27 |
| Jackson, WY | 134 mi | Jun 20 | Aug 31 |
| Belgrade, MT | 137 mi | May 26 | Sep 16 |
Frequently asked questions
When is the last frost in Powell?
On average, the last spring frost (32°F) in Powell is around May 19. In about 1 year in 10 it comes after June 4, and in 9 years in 10 it comes after May 5.
When is the first frost in Powell?
The first fall frost (32°F) usually arrives around September 20. There’s a 10% chance of a freeze by September 7 and a 90% chance by October 1.
What growing zone is Powell?
Powell 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 82440. See growing zones in Wyoming.
More: all Wyoming frost dates · Wyoming growing zones · frost vs. freeze