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Will it freeze in Lewiston in the next 7 nights?
No overnight lows at or below 32°F are forecast in Lewiston during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 37°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 37°F Above 36°F · Mostly Clear
- Fri, Nov 6 41°F Above 36°F · Mostly Cloudy
- Sat, Nov 7 43°F Above 36°F · Partly Cloudy
- Sun, Nov 8 40°F Above 36°F · Mostly Cloudy
- Mon, Nov 9 41°F Above 36°F · Mostly Cloudy then Slight Chance Light Rain
- Tue, Nov 10 43°F Above 36°F · Slight Chance Light Rain
- Wed, Nov 11 44°F Above 36°F · Slight Chance Light Rain
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 Lewiston
The median first fall hard-freeze date (28°F) is November 8, from NOAA’s 1991–2020 Climate Normals at Lewiston Nez Perce 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 | Apr 11 · Apr 29 · May 12 | Oct 1 · Oct 13 · Oct 28 | 170 days |
| 32°F freeze | Mar 20 · Apr 6 · Apr 26 | Oct 10 · Oct 26 · Nov 12 | 200 days |
| 28°F hard freeze | Feb 25 · Mar 15 · Apr 4 | Oct 20 · Nov 8 · Nov 28 | 235 days |
Average high temperature by month
1991–2020 normals at Lewiston Nez Perce 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 Lewiston, ID come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Lewiston Nez Perce County Airport (station USW00024149, elevation 1,436 ft), 1.7 mi from Lewiston. 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 Lewiston
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Clarkston, WA | 3.1 mi | Apr 6 | Oct 26 |
| Moscow, ID | 24 mi | Apr 29 | Oct 2 |
| Pullman, WA | 25 mi | May 6 | Sep 29 |
| Walla Walla, WA | 68 mi | Mar 27 | Oct 31 |
| College Place, WA | 71 mi | May 2 | Oct 1 |
| Milton-Freewater, OR | 74 mi | Mar 25 | Oct 29 |
| Cheney, WA | 81 mi | May 30 | Sep 4 |
| Liberty Lake, WA | 88 mi | Apr 26 | Oct 15 |
| Spokane Valley, WA | 88 mi | Apr 26 | Oct 15 |
| Connell, WA | 89 mi | Apr 30 | Oct 12 |
Frequently asked questions
When is the last frost in Lewiston?
On average, the last spring frost (32°F) in Lewiston is around April 6. In about 1 year in 10 it comes after April 26, and in 9 years in 10 it comes after March 20.
When is the first frost in Lewiston?
The first fall frost (32°F) usually arrives around October 26. There’s a 10% chance of a freeze by October 10 and a 90% chance by November 12.
Can it frost in Lewiston 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 April 29.
What growing zone is Lewiston?
Lewiston is in USDA Plant Hardiness Zone 7a (average annual extreme minimum temperature 0 to 5°F), based on the 2023 USDA map for ZIP code 99179. See growing zones in Idaho.
More: all Idaho frost dates · Idaho growing zones · UV index today in Lewiston · frost vs. freeze