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Will it freeze in Jerome in the next 7 nights?
No overnight lows at or below 32°F are forecast in Jerome 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 34°F Frost possible · Partly Cloudy
- Sat, Nov 7 38°F Above 36°F · Mostly Clear
- Sun, Nov 8 38°F Above 36°F · Partly Cloudy
- Mon, Nov 9 40°F Above 36°F · Partly Cloudy
- Tue, Nov 10 40°F Above 36°F · Mostly Clear
- Wed, Nov 11 41°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 Jerome
The median first fall hard-freeze date (28°F) is October 27, from NOAA’s 1991–2020 Climate Normals at Jerome. 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 30 · May 15 · Jun 8 | Sep 17 · Oct 3 · Oct 17 | 138 days |
| 32°F freeze | Apr 15 · May 2 · May 30 | Sep 30 · Oct 14 · Oct 29 | 166 days |
| 28°F hard freeze | Mar 24 · Apr 14 · May 10 | Oct 13 · Oct 27 · Nov 11 | 194 days |
Average high temperature by month
1991–2020 normals at Jerome
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 Jerome, ID come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Jerome (station USC00104670, elevation 3,740 ft), 1.1 mi from Jerome. 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 Jerome
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Twin Falls, ID | 11 mi | Apr 30 | Oct 9 |
| Kimberly, ID | 15 mi | May 6 | Oct 3 |
| Burley, ID | 39 mi | May 7 | Oct 4 |
| Rupert, ID | 43 mi | May 6 | Oct 6 |
| Hailey, ID | 56 mi | May 13 | Oct 2 |
| Mountain Home, ID | 66 mi | May 2 | Oct 8 |
| Pocatello, ID | 104 mi | May 2 | Oct 11 |
| Chubbuck, ID | 105 mi | May 16 | Oct 2 |
| Boise, ID | 106 mi | Apr 24 | Oct 21 |
| Kuna, ID | 111 mi | Apr 24 | Oct 21 |
Frequently asked questions
When is the last frost in Jerome?
On average, the last spring frost (32°F) in Jerome is around May 2. In about 1 year in 10 it comes after May 30, and in 9 years in 10 it comes after April 15.
When is the first frost in Jerome?
The first fall frost (32°F) usually arrives around October 14. There’s a 10% chance of a freeze by September 30 and a 90% chance by October 29.
Can it frost in Jerome 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 15.
What growing zone is Jerome?
Jerome 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 83338. See growing zones in Idaho.
More: all Idaho frost dates · Idaho growing zones · frost vs. freeze