Frost dates for ZIP 78391 (Tynan, 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, Sinton, TX (14 miles away).
- Average last spring frostFeb 150% chance of a 32°F freeze after this date
- Average first fall frostDec 1750% chance of a 32°F freeze by this date
- Growing season (frost-free)324 daysmedian, 32°F threshold
- USDA hardiness zone9b25 to 30°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) | Dec 27 (prior Dec) |
| 50% (the "average" last frost) | Feb 1 |
| 10% (safe-side: only 1 year in 10 freezes later) | Mar 6 |
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 22 |
| 50% (the "average" first frost) | Dec 17 |
| 90% (late: most years have frozen by now) | Jan 17 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Feb 25 | Dec 1 |
| 32°F (freeze) | Feb 1 | Dec 17 |
| 28°F (hard freeze) | Jan 12 | Jan 1 (next year) |
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 Tynan
Soil temperature now
2-inch depth
76°F 55°F or warmer
24-hour average · latest 76°F, as of Oct 17, 7:00 PM CDT
Measured at TexMesonet (TWDB) station RB Farms Inc, 9 mi away. Daily averages: Thu 81°, Fri 79°.
4-inch depth
76°F 55°F or warmer
24-hour average · latest 76°F, as of Oct 17, 7:00 PM CDT
Measured at TexMesonet (TWDB) station RB Farms Inc, 9 mi away. Daily averages: Thu 81°, Fri 79°.
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 | 50° | Mostly Clear | |
| Sunday | 76° | 57° | Sunny |
| Monday | 80° | 62° | Mostly Sunny |
| Tuesday | 84° | 64° | Sunny |
| Wednesday | 86° | 63° | Mostly Sunny |
| Thursday | 88° | 63° | Sunny |
| Friday | 87° | 66° | 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 78391
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: Sinton, TX (NOAA GHCN-Daily ID USC00418354), elevation 48 ft, 13.9 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Mathis 4 SSW, TX | 14 mi | Jan 31 | Dec 23 |
| Welder Wildlife Foundation, TX | 18 mi | Feb 24 | Dec 1 |
| Beeville 5 NE, TX | 19 mi | Feb 17 | Dec 8 |
The average last-frost dates of these stations span 24 days, a rough guide to local variation. See data sources & methods.
Questions
When is the last frost in 78391?
The average (50% chance) last spring freeze of 32°F for ZIP 78391 is February 1. For a safer planting date, use March 6, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78391?
The average first fall freeze is December 17. In 1 year in 10 it comes by November 22.
What hardiness zone is 78391?
ZIP 78391 is in USDA zone 9b (25 to 30°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
Other ZIP codes in Bee County
78102 78104 78125 78142 78145 78146 78162 78389 All Bee County ZIPs