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Will it freeze in Twin Falls in the next 7 nights?
No overnight lows at or below 32°F are forecast in Twin Falls during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 33°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 33°F Frost possible · Mostly Clear
- Fri, Nov 6 33°F Frost possible · Partly Cloudy
- Sat, Nov 7 37°F Above 36°F · Mostly Clear
- Sun, Nov 8 37°F Above 36°F · Partly Cloudy
- Mon, Nov 9 39°F Above 36°F · Partly Cloudy
- Tue, Nov 10 39°F Above 36°F · Mostly Clear
- Wed, Nov 11 39°F Above 36°F · 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 Twin Falls
The median first fall hard-freeze date (28°F) is October 23, from NOAA’s 1991–2020 Climate Normals at Twin Falls-Kmvt. 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 1 · May 14 · Jun 2 | Sep 12 · Sep 28 · Oct 12 | 136 days |
| 32°F freeze | Apr 17 · Apr 30 · May 14 | Sep 24 · Oct 9 · Oct 24 | 161 days |
| 28°F hard freeze | Mar 30 · Apr 17 · Apr 30 | Oct 7 · Oct 23 · Nov 5 | 187 days |
Average high temperature by month
1991–2020 normals at Twin Falls-Kmvt
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 Twin Falls, ID come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Twin Falls-Kmvt (station USC00109293, elevation 3,670 ft), 1.2 mi from Twin 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 Twin Falls
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Kimberly, ID | 5.0 mi | May 6 | Oct 3 |
| Jerome, ID | 11 mi | May 2 | Oct 14 |
| Burley, ID | 34 mi | May 7 | Oct 4 |
| Rupert, ID | 40 mi | May 6 | Oct 6 |
| Hailey, ID | 66 mi | May 13 | Oct 2 |
| Mountain Home, ID | 74 mi | May 2 | Oct 8 |
| Pocatello, ID | 104 mi | May 2 | Oct 11 |
| Chubbuck, ID | 104 mi | May 16 | Oct 2 |
| Boise, ID | 114 mi | Apr 24 | Oct 21 |
| Blackfoot, ID | 116 mi | May 5 | Oct 3 |
Frequently asked questions
When is the last frost in Twin Falls?
On average, the last spring frost (32°F) in Twin Falls is around April 30. In about 1 year in 10 it comes after May 14, and in 9 years in 10 it comes after April 17.
When is the first frost in Twin Falls?
The first fall frost (32°F) usually arrives around October 9. There’s a 10% chance of a freeze by September 24 and a 90% chance by October 24.
Can it frost in Twin 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 14.
What growing zone is Twin Falls?
Twin Falls 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 83328. See growing zones in Idaho.
More: all Idaho frost dates · Idaho growing zones · UV index today in Twin Falls · frost vs. freeze