Frost dates for ZIP 75020 (Denison, TX)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, Sherman, TX (5 miles away).
- Average last spring frostMar 1450% chance of a 32°F freeze after this date
- Average first fall frostNov 1950% chance of a 32°F freeze by this date
- Growing season (frost-free)250 daysmedian, 32°F threshold
- USDA hardiness zone8a10 to 15°F avg. coldest night
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Feb 25 |
| 50% (the "average" last frost) | Mar 14 |
| 10% (safe-side: only 1 year in 10 freezes later) | Apr 1 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Nov 2 |
| 50% (the "average" first frost) | Nov 19 |
| 90% (late: most years have frozen by now) | Dec 6 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 28 | Nov 9 |
| 32°F (freeze) | Mar 14 | Nov 19 |
| 28°F (hard freeze) | Mar 2 | Nov 30 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
This week in Denison
Soil temperature now
2-inch depth
65°F 55°F or warmer
24-hour average · latest 69°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Lake Ralph Hall (45 mi), Prairie Hill Nocona (57 mi), Hooten (58 mi).
4-inch depth
69°F 55°F or warmer
24-hour average · latest 73°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Mustang Special (37 mi), Lake Ralph Hall (45 mi), Prairie Hill Nocona (57 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
No frost in the 7-day forecast.
| Period | High | Low | Forecast |
|---|---|---|---|
| Tonight | 40° | Clear | |
| Sunday | 69° | 46° | Sunny |
| Monday | 74° | 52° | Sunny |
| Tuesday | 77° | 54° | Sunny |
| Wednesday | 81° | 58° | Sunny |
| Thursday | 83° | 61° | Sunny |
| Friday | 84° | 63° | Mostly Sunny |
National Weather Service forecast, issued Oct 17, 8:28 PM CDT. Frost can form above 32°F on clear, calm nights. Full NWS forecast.
Free frost alerts for 75020
An email when the National Weather Service forecasts a freeze for this ZIP, plus the spring soil-temperature heads-up. At most a few a month.
Alerts open soon. This form is a preview and doesn't send anything yet.
Where these numbers come from
Station: Sherman, TX (NOAA GHCN-Daily ID USC00418274), elevation 760 ft, 5.2 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Durant 6SSE Mesonet, OK | 19 mi | Mar 19 | Nov 12 |
| Durant, OK | 21 mi | Mar 31 | Nov 5 |
| Madill, OK | 24 mi | Mar 27 | Nov 8 |
The average last-frost dates of these stations span 17 days, a rough guide to local variation. See data sources & methods.
Questions
When is the last frost in 75020?
The average (50% chance) last spring freeze of 32°F for ZIP 75020 is March 14. For a safer planting date, use April 1, when only 1 year in 10 still sees a later freeze.
When is the first frost in 75020?
The average first fall freeze is November 19. In 1 year in 10 it comes by November 2.
What hardiness zone is 75020?
ZIP 75020 is in USDA zone 8a (10 to 15°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
Other ZIP codes in Grayson County
75021 75058 75076 75090 75092 75414 75459 75489 75491 75495 76233 76245 76264 76268 76271 76273 All Grayson County ZIPs