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Will it freeze in Vernal in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Fri, Nov 6: 32°F (Fri, Nov 6, 6:00 PM MST to Sat, Nov 7, 6:00 AM MST).
Tonight: forecast low 34°F. Frost possible.
NWS forecast period: Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 34°F Frost possible · Mostly Cloudy then Patchy Fog
- Fri, Nov 6 32°F Freeze · Mostly Clear
- Sat, Nov 7 33°F Frost possible · Mostly Clear
- Sun, Nov 8 35°F Frost possible · Mostly Clear
- Mon, Nov 9 36°F Frost possible · Partly Cloudy
- Tue, Nov 10 36°F Frost possible · Partly Cloudy
- Wed, Nov 11 36°F Frost possible · Mostly Clear
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 Vernal
The median first fall hard-freeze date (28°F) is October 18, from NOAA’s 1991–2020 Climate Normals at Vernal. 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 5 · May 23 · Jun 9 | Sep 13 · Sep 27 · Oct 8 | 126 days |
| 32°F freeze | Apr 24 · May 7 · May 28 | Sep 23 · Oct 6 · Oct 20 | 150 days |
| 28°F hard freeze | Apr 11 · Apr 25 · May 11 | Oct 3 · Oct 18 · Oct 30 | 174 days |
Average high temperature by month
1991–2020 normals at Vernal
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 Vernal, UT come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Vernal (station USC00429111, elevation 5,345 ft), 0.8 mi from Vernal. 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 Vernal
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Roosevelt, UT | 26 mi | May 23 | Sep 22 |
| Green River, WY | 73 mi | May 24 | Sep 22 |
| Rock Springs, WY | 81 mi | May 24 | Sep 24 |
| Price, UT | 89 mi | May 3 | Oct 12 |
| Evanston, WY | 93 mi | Jun 12 | Sep 12 |
| Heber, UT | 98 mi | Jun 4 | Sep 20 |
| Fruita, CO | 99 mi | Apr 27 | Oct 11 |
| Midway, UT | 102 mi | May 31 | Sep 11 |
| Park City, UT | 104 mi | May 29 | Sep 25 |
| Craig, CO | 104 mi | Jun 6 | Sep 12 |
Frequently asked questions
When is the last frost in Vernal?
On average, the last spring frost (32°F) in Vernal is around May 7. In about 1 year in 10 it comes after May 28, and in 9 years in 10 it comes after April 24.
When is the first frost in Vernal?
The first fall frost (32°F) usually arrives around October 6. There’s a 10% chance of a freeze by September 23 and a 90% chance by October 20.
Can it frost in Vernal 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 23.
What growing zone is Vernal?
Vernal is in USDA Plant Hardiness Zone 5b (average annual extreme minimum temperature −15 to −10°F), based on the 2023 USDA map for ZIP code 84078. See growing zones in Utah.
More: all Utah frost dates · Utah growing zones · frost vs. freeze