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Will it freeze in Delta in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Sat, Nov 7: 32°F (Sat, Nov 7, 6:00 PM MST to Sun, Nov 8, 6:00 AM MST).
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.
7 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 35°F Frost possible · Patchy Fog
- Fri, Nov 6 33°F Frost possible · Mostly Clear
- Sat, Nov 7 32°F Freeze · Mostly Clear
- Sun, Nov 8 34°F Frost possible · Mostly Clear
- Mon, Nov 9 36°F Frost possible · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Partly Cloudy
- Wed, Nov 11 35°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 Delta
The median first fall hard-freeze date (28°F) is October 16, from NOAA’s 1991–2020 Climate Normals at Delta 3E. 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 14 · May 29 | Sep 20 · Sep 30 · Oct 9 | 138 days |
| 32°F freeze | Apr 19 · May 1 · May 14 | Sep 26 · Oct 7 · Oct 19 | 159 days |
| 28°F hard freeze | Apr 5 · Apr 19 · May 3 | Oct 3 · Oct 16 · Oct 29 | 180 days |
Average high temperature by month
1991–2020 normals at Delta 3E
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 Delta, CO come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Delta 3E (station USC00052196, elevation 5,027 ft), 3.2 mi from Delta. 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 Delta
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Montrose, CO | 24 mi | Apr 28 | Oct 14 |
| Grand Junction, CO | 35 mi | Apr 14 | Oct 23 |
| Fruita, CO | 44 mi | Apr 27 | Oct 11 |
| Rifle, CO | 57 mi | May 11 | Oct 4 |
| Carbondale, CO | 65 mi | May 13 | Oct 3 |
| Gunnison, CO | 65 mi | Jun 21 | Sep 5 |
| Glenwood Springs, CO | 68 mi | May 13 | Oct 3 |
| Aspen, CO | 74 mi | Jun 2 | Sep 23 |
| Moab, UT | 80 mi | Apr 11 | Oct 23 |
| Gypsum, CO | 85 mi | May 1 | Oct 14 |
Frequently asked questions
When is the last frost in Delta?
On average, the last spring frost (32°F) in Delta is around May 1. In about 1 year in 10 it comes after May 14, and in 9 years in 10 it comes after April 19.
When is the first frost in Delta?
The first fall frost (32°F) usually arrives around October 7. There’s a 10% chance of a freeze by September 26 and a 90% chance by October 19.
Can it frost in Delta 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 14.
What growing zone is Delta?
Delta 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 81410. See growing zones in Colorado.
More: all Colorado frost dates · Colorado growing zones · frost vs. freeze