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Will it freeze in Hailey in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 28°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 28°F. Hard 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 28°F Hard freeze · Areas Of Fog
- Fri, Nov 6 31°F Freeze · Partly Cloudy
- Sat, Nov 7 33°F Frost possible · Mostly Clear
- Sun, Nov 8 34°F Frost possible · Partly Cloudy
- Mon, Nov 9 35°F Frost possible · Partly Cloudy
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 37°F Above 36°F · Slight Chance Light Rain then 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 Hailey
The median first fall hard-freeze date (28°F) is October 14, from NOAA’s 1991–2020 Climate Normals at Bellevue. 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 15 · Jun 2 · Jun 22 | Sep 3 · Sep 20 · Oct 4 | 106 days |
| 32°F freeze | Apr 30 · May 13 · Jun 3 | Sep 15 · Oct 2 · Oct 17 | 139 days |
| 28°F hard freeze | Apr 12 · Apr 28 · May 11 | Sep 30 · Oct 14 · Oct 30 | 169 days |
Average high temperature by month
1991–2020 normals at Bellevue
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 Hailey, ID come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Bellevue (station USC00100774, elevation 5,192 ft), 3.8 mi from Hailey. 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 Hailey
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Jerome, ID | 56 mi | May 2 | Oct 14 |
| Twin Falls, ID | 66 mi | Apr 30 | Oct 9 |
| Kimberly, ID | 68 mi | May 6 | Oct 3 |
| Rupert, ID | 70 mi | May 6 | Oct 6 |
| Burley, ID | 72 mi | May 7 | Oct 4 |
| Mountain Home, ID | 75 mi | May 2 | Oct 8 |
| Boise, ID | 97 mi | Apr 24 | Oct 21 |
| Garden City, ID | 101 mi | May 17 | Oct 12 |
| Blackfoot, ID | 101 mi | May 5 | Oct 3 |
| Chubbuck, ID | 101 mi | May 16 | Oct 2 |
Frequently asked questions
When is the last frost in Hailey?
On average, the last spring frost (32°F) in Hailey is around May 13. In about 1 year in 10 it comes after June 3, and in 9 years in 10 it comes after April 30.
When is the first frost in Hailey?
The first fall frost (32°F) usually arrives around October 2. There’s a 10% chance of a freeze by September 15 and a 90% chance by October 17.
Can it frost in Hailey 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 2.
What growing zone is Hailey?
Hailey is in USDA Plant Hardiness Zone 6a (average annual extreme minimum temperature −10 to −5°F), based on the 2023 USDA map for ZIP code 83333. See growing zones in Idaho.
More: all Idaho frost dates · Idaho growing zones · frost vs. freeze