Frost dates for ZIP 75491 (Whitewright, 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, Bonham 3NNE, TX (17 miles away).
- Average last spring frostMar 1650% chance of a 32°F freeze after this date
- Average first fall frostNov 1350% chance of a 32°F freeze by this date
- Growing season (frost-free)242 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 28 |
| 50% (the "average" last frost) | Mar 16 |
| 10% (safe-side: only 1 year in 10 freezes later) | Apr 4 |
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) | Oct 29 |
| 50% (the "average" first frost) | Nov 13 |
| 90% (late: most years have frozen by now) | Dec 1 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 31 | Nov 3 |
| 32°F (freeze) | Mar 16 | Nov 13 |
| 28°F (hard freeze) | Mar 4 | Nov 24 |
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 Whitewright
Soil temperature now
2-inch depth
66°F 55°F or warmer
24-hour average · latest 70°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Lake Ralph Hall (26 mi), Hooten (40 mi).
4-inch depth
70°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 Lake Ralph Hall (26 mi), Mustang Special (34 mi), Hooten (40 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 | 41° | Clear | |
| Sunday | 69° | 46° | Sunny |
| Monday | 75° | 51° | Sunny |
| Tuesday | 79° | 54° | Sunny |
| Wednesday | 83° | 58° | Sunny |
| Thursday | 85° | 61° | Sunny |
| Friday | 85° | 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 75491
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: Bonham 3NNE, TX (NOAA GHCN-Daily ID USC00410923), elevation 592 ft, 17.0 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Sherman, TX | 21 mi | Mar 14 | Nov 19 |
| Mckinney Municipal Airport, TX | 23 mi | Mar 17 | Nov 15 |
| Mckinney Muni AP, TX | 24 mi | Mar 18 | Nov 11 |
The average last-frost dates of these stations span 4 days, a rough guide to local variation. See data sources & methods.
Questions
When is the last frost in 75491?
The average (50% chance) last spring freeze of 32°F for ZIP 75491 is March 16. For a safer planting date, use April 4, when only 1 year in 10 still sees a later freeze.
When is the first frost in 75491?
The average first fall freeze is November 13. In 1 year in 10 it comes by October 29.
What hardiness zone is 75491?
ZIP 75491 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
75020 75021 75058 75076 75090 75092 75414 75459 75489 75495 76233 76245 76264 76268 76271 76273 All Grayson County ZIPs