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Will it freeze in Duncan in the next 7 nights?
No overnight lows at or below 32°F are forecast in Duncan during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 46°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 46°F Above 36°F · Slight Chance Rain Showers then Partly Cloudy
- Fri, Nov 6 41°F Above 36°F · Partly Cloudy
- Sat, Nov 7 42°F Above 36°F · Partly Cloudy
- Sun, Nov 8 43°F Above 36°F · Mostly Clear
- Mon, Nov 9 46°F Above 36°F · Mostly Clear
- Tue, Nov 10 49°F Above 36°F · Mostly Clear
- Wed, Nov 11 48°F Above 36°F · 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 Duncan
The median first fall hard-freeze date (28°F) is November 16, from NOAA’s 1991–2020 Climate Normals at Duncan. 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 | Mar 21 · Apr 7 · Apr 24 | Oct 16 · Oct 30 · Nov 13 | 205 days |
| 32°F freeze | Mar 3 · Mar 25 · Apr 12 | Oct 22 · Nov 7 · Nov 23 | 225 days |
| 28°F hard freeze | Feb 24 · Mar 11 · Mar 31 | Oct 31 · Nov 16 · Dec 4 | 249 days |
Average high temperature by month
1991–2020 normals at Duncan
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 Duncan, OK come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Duncan (station USC00342660, elevation 1,125 ft), 1.4 mi from Duncan. 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 Duncan
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Lawton, OK | 28 mi | Mar 26 | Nov 7 |
| Chickasha, OK | 39 mi | Apr 4 | Nov 1 |
| Anadarko, OK | 43 mi | Apr 8 | Oct 30 |
| Burkburnett, TX | 45 mi | Mar 26 | Nov 9 |
| Pauls Valley, OK | 45 mi | Mar 28 | Nov 7 |
| Lone Grove, OK | 45 mi | Mar 21 | Nov 8 |
| Blanchard, OK | 49 mi | Apr 3 | Nov 4 |
| Purcell, OK | 50 mi | Apr 4 | Nov 2 |
| Wichita Falls, TX | 51 mi | Mar 26 | Nov 9 |
| Ardmore, OK | 51 mi | Mar 15 | Nov 14 |
Frequently asked questions
When is the last frost in Duncan?
On average, the last spring frost (32°F) in Duncan is around March 25. In about 1 year in 10 it comes after April 12, and in 9 years in 10 it comes after March 3.
When is the first frost in Duncan?
The first fall frost (32°F) usually arrives around November 7. There’s a 10% chance of a freeze by October 22 and a 90% chance by November 23.
Can it frost in Duncan 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 April 7.
What growing zone is Duncan?
Duncan is in USDA Plant Hardiness Zone 8a (average annual extreme minimum temperature 10 to 15°F), based on the 2023 USDA map for ZIP code 73533. See growing zones in Oklahoma.
More: all Oklahoma frost dates · Oklahoma growing zones · frost vs. freeze