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Will it freeze in Evanston 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.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 28°F Hard freeze · Mostly Cloudy
- Fri, Nov 6 24°F Hard freeze · Clear
- Sat, Nov 7 28°F Hard freeze · Mostly Clear
- Sun, Nov 8 31°F Freeze · Mostly Clear
- Mon, Nov 9 32°F Freeze · Partly Cloudy
- Tue, Nov 10 31°F Freeze · Partly Cloudy
- Wed, Nov 11 32°F Freeze · 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 Evanston
The median first fall hard-freeze date (28°F) is September 24, from NOAA’s 1991–2020 Climate Normals at Evanston 1 E. 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 | rare in most years | rare in most years | 63 days |
| 32°F freeze | May 26 · Jun 12 · Jul 2 | Aug 26 · Sep 12 · Sep 25 | 90 days |
| 28°F hard freeze | May 5 · May 24 · Jun 14 | Sep 7 · Sep 24 · Oct 9 | 121 days |
Average high temperature by month
1991–2020 normals at Evanston 1 E
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 Evanston, WY come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Evanston 1 E (station USC00483100, elevation 6,825 ft), 0.7 mi from Evanston. 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 Evanston
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Park City, UT | 50 mi | May 29 | Sep 25 |
| Fruit Heights, UT | 52 mi | Apr 19 | Oct 19 |
| South Weber, UT | 52 mi | Apr 29 | Oct 20 |
| North Ogden, UT | 52 mi | Apr 19 | Oct 22 |
| South Ogden, UT | 52 mi | Apr 22 | Oct 22 |
| Ogden, UT | 52 mi | Apr 21 | Oct 23 |
| Hyrum, UT | 52 mi | May 12 | Sep 28 |
| Farmington, UT | 53 mi | Apr 19 | Oct 19 |
| Washington Terrace, UT | 53 mi | Apr 22 | Oct 22 |
| Harrisville, UT | 53 mi | Apr 21 | Oct 23 |
Frequently asked questions
When is the last frost in Evanston?
On average, the last spring frost (32°F) in Evanston is around June 12. In about 1 year in 10 it comes after July 2, and in 9 years in 10 it comes after May 26.
When is the first frost in Evanston?
The first fall frost (32°F) usually arrives around September 12. There’s a 10% chance of a freeze by August 26 and a 90% chance by September 25.
What growing zone is Evanston?
Evanston is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 84086. See growing zones in Wyoming.
More: all Wyoming frost dates · Wyoming growing zones · frost vs. freeze