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Will it freeze in Milliken in the next 7 nights?
No overnight lows at or below 32°F are forecast in Milliken during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 35°F. Frost possible.
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 35°F Frost possible · Mostly Cloudy
- Fri, Nov 6 34°F Frost possible · Mostly Clear
- Sat, Nov 7 34°F Frost possible · Mostly Clear
- Sun, Nov 8 36°F Frost possible · Clear
- Mon, Nov 9 37°F Above 36°F · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Partly Cloudy
- Wed, Nov 11 35°F Frost possible · 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 Milliken
The median first fall hard-freeze date (28°F) is October 18, from NOAA’s 1991–2020 Climate Normals at Greeley Unc. 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 1 · May 12 · May 26 | Sep 18 · Sep 30 · Oct 11 | 139 days |
| 32°F freeze | Apr 17 · May 2 · May 14 | Sep 26 · Oct 8 · Oct 21 | 159 days |
| 28°F hard freeze | Apr 5 · Apr 20 · May 5 | Oct 4 · Oct 18 · Nov 1 | 179 days |
Average high temperature by month
1991–2020 normals at Greeley Unc
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 Milliken, CO come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Greeley Unc (station USC00053553, elevation 4,715 ft), 11 mi from Milliken. 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 Milliken
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Johnstown, CO | 2.5 mi | May 10 | Oct 1 |
| Berthoud, CO | 6.2 mi | May 7 | Oct 5 |
| Evans, CO | 6.2 mi | May 2 | Oct 8 |
| Greeley, CO | 8.7 mi | May 2 | Oct 8 |
| Mead, CO | 8.7 mi | May 7 | Oct 5 |
| Firestone, CO | 12 mi | May 7 | Oct 5 |
| Windsor, CO | 12 mi | May 3 | Oct 6 |
| Loveland, CO | 13 mi | May 10 | Oct 1 |
| Severance, CO | 14 mi | May 3 | Oct 6 |
| Frederick, CO | 16 mi | May 7 | Oct 5 |
Frequently asked questions
When is the last frost in Milliken?
On average, the last spring frost (32°F) in Milliken is around May 2. In about 1 year in 10 it comes after May 14, and in 9 years in 10 it comes after April 17.
When is the first frost in Milliken?
The first fall frost (32°F) usually arrives around October 8. There’s a 10% chance of a freeze by September 26 and a 90% chance by October 21.
Can it frost in Milliken 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 12.
What growing zone is Milliken?
Milliken 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 80543. See growing zones in Colorado.
More: all Colorado frost dates · Colorado growing zones · frost vs. freeze