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Will it freeze in Lander 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.
6 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 31°F Freeze · Mostly Clear
- Sat, Nov 7 34°F Frost possible · Mostly Clear
- Sun, Nov 8 36°F Frost possible · Partly Cloudy
- Mon, Nov 9 37°F Above 36°F · Partly Cloudy
- Tue, Nov 10 35°F Frost possible · Mostly Clear
- Wed, Nov 11 36°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 Lander
The median first fall hard-freeze date (28°F) is October 6, from NOAA’s 1991–2020 Climate Normals at Lander Hunt Field 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 18 · Jun 1 · Jun 16 | Sep 7 · Sep 19 · Sep 29 | 107 days |
| 32°F freeze | May 4 · May 18 · Jun 3 | Sep 13 · Sep 27 · Oct 10 | 131 days |
| 28°F hard freeze | Apr 22 · May 4 · May 20 | Sep 23 · Oct 6 · Oct 20 | 153 days |
Average high temperature by month
1991–2020 normals at Lander Hunt Field 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 Lander, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Lander Hunt Field Airport (station USW00024021, elevation 5,592 ft), 1.1 mi from Lander. 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 Lander
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Riverton, WY | 22 mi | May 12 | Sep 24 |
| Rock Springs, WY | 89 mi | May 24 | Sep 24 |
| Green River, WY | 99 mi | May 24 | Sep 22 |
| Rawlins, WY | 106 mi | May 17 | Oct 2 |
| Jackson, WY | 112 mi | Jun 20 | Aug 31 |
| Cody, WY | 118 mi | May 12 | Oct 1 |
| Casper, WY | 122 mi | May 10 | Sep 29 |
| Powell, WY | 134 mi | May 19 | Sep 20 |
| Evanston, WY | 158 mi | Jun 12 | Sep 12 |
| Sheridan, WY | 162 mi | May 21 | Sep 23 |
Frequently asked questions
When is the last frost in Lander?
On average, the last spring frost (32°F) in Lander is around May 18. In about 1 year in 10 it comes after June 3, and in 9 years in 10 it comes after May 4.
When is the first frost in Lander?
The first fall frost (32°F) usually arrives around September 27. There’s a 10% chance of a freeze by September 13 and a 90% chance by October 10.
Can it frost in Lander 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 1.
What growing zone is Lander?
Lander 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 82515. See growing zones in Wyoming.
More: all Wyoming frost dates · Wyoming growing zones · frost vs. freeze