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Will it freeze in Post Falls in the next 7 nights?
No overnight lows at or below 32°F are forecast in Post Falls during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 36°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 36°F Frost possible · Patchy Fog
- Fri, Nov 6 39°F Above 36°F · Slight Chance Light Rain
- Sat, Nov 7 41°F Above 36°F · Mostly Cloudy then Chance Light Rain
- Sun, Nov 8 36°F Frost possible · Mostly Cloudy
- Mon, Nov 9 39°F Above 36°F · Chance Light Rain
- Tue, Nov 10 42°F Above 36°F · Chance Light Rain
- Wed, Nov 11 42°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 Post Falls
The median first fall hard-freeze date (28°F) is November 1, from NOAA’s 1991–2020 Climate Normals at Coeur D'alene. 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 25 · May 7 · May 21 | Sep 23 · Oct 6 · Oct 21 | 151 days |
| 32°F freeze | Apr 4 · Apr 22 · May 6 | Oct 4 · Oct 18 · Nov 5 | 179 days |
| 28°F hard freeze | Mar 13 · Apr 1 · Apr 21 | Oct 15 · Nov 1 · Nov 20 | 214 days |
Average high temperature by month
1991–2020 normals at Coeur D'alene
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 Post Falls, ID come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Coeur D'alene (station USC00101956, elevation 2,133 ft), 7.5 mi from Post Falls. 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 Post Falls
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Rathdrum, ID | 5.6 mi | Apr 22 | Oct 18 |
| Coeur d'Alene, ID | 6.8 mi | Apr 22 | Oct 18 |
| Hayden, ID | 7.5 mi | Apr 22 | Oct 18 |
| Liberty Lake, WA | 8.7 mi | Apr 26 | Oct 15 |
| Spokane Valley, WA | 14 mi | Apr 26 | Oct 15 |
| Spokane, WA | 23 mi | Apr 26 | Oct 15 |
| Deer Park, WA | 29 mi | May 22 | Sep 14 |
| Airway Heights, WA | 30 mi | Apr 26 | Oct 12 |
| Cheney, WA | 34 mi | May 30 | Sep 4 |
| Sandpoint, ID | 42 mi | May 8 | Sep 28 |
Frequently asked questions
When is the last frost in Post Falls?
On average, the last spring frost (32°F) in Post Falls is around April 22. In about 1 year in 10 it comes after May 6, and in 9 years in 10 it comes after April 4.
When is the first frost in Post Falls?
The first fall frost (32°F) usually arrives around October 18. There’s a 10% chance of a freeze by October 4 and a 90% chance by November 5.
Can it frost in Post Falls 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 7.
What growing zone is Post Falls?
Post Falls is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 83854. See growing zones in Idaho.
More: all Idaho frost dates · Idaho growing zones · UV index today in Post Falls · frost vs. freeze