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Will it freeze in Brush in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 31°F (Thu, Nov 5, 6:00 PM MST to Fri, Nov 6, 6:00 AM MST).
Tonight: forecast low 31°F. 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 31°F Freeze · Partly Cloudy
- Fri, Nov 6 32°F Freeze · Mostly Clear
- Sat, Nov 7 32°F Freeze · Mostly Clear
- Sun, Nov 8 35°F Frost possible · Clear
- Mon, Nov 9 35°F Frost possible · Mostly Clear
- Tue, Nov 10 37°F Above 36°F · 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 Brush
The median first fall hard-freeze date (28°F) is October 15, from NOAA’s 1991–2020 Climate Normals at Ft Morgan. 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 4 · May 15 · May 29 | Sep 17 · Sep 28 · Oct 8 | 135 days |
| 32°F freeze | Apr 23 · May 6 · May 19 | Sep 24 · Oct 6 · Oct 18 | 153 days |
| 28°F hard freeze | Apr 11 · Apr 27 · May 9 | Oct 2 · Oct 15 · Oct 26 | 171 days |
Average high temperature by month
1991–2020 normals at Ft Morgan
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 Brush, CO come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Ft Morgan (station USC00053038, elevation 4,376 ft), 12 mi from Brush. 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 Brush
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Fort Morgan, CO | 8.1 mi | May 6 | Oct 6 |
| Sterling, CO | 34 mi | Apr 30 | Oct 9 |
| Evans, CO | 59 mi | May 2 | Oct 8 |
| Eaton, CO | 60 mi | May 2 | Oct 8 |
| Lochbuie, CO | 60 mi | May 3 | Oct 7 |
| Greeley, CO | 61 mi | May 2 | Oct 8 |
| Fort Lupton, CO | 63 mi | May 3 | Oct 7 |
| Brighton, CO | 65 mi | May 3 | Oct 7 |
| Milliken, CO | 65 mi | May 2 | Oct 8 |
| Commerce City, CO | 66 mi | May 3 | Oct 7 |
Frequently asked questions
When is the last frost in Brush?
On average, the last spring frost (32°F) in Brush is around May 6. In about 1 year in 10 it comes after May 19, and in 9 years in 10 it comes after April 23.
When is the first frost in Brush?
The first fall frost (32°F) usually arrives around October 6. There’s a 10% chance of a freeze by September 24 and a 90% chance by October 18.
Can it frost in Brush 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 Brush?
Brush 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 80723. See growing zones in Colorado.
More: all Colorado frost dates · Colorado growing zones · frost vs. freeze