Frost dates for ZIP 78069 (Somerset, 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, Lytle 3W, TX (11 miles away).
- Average last spring frostFeb 2450% chance of a 32°F freeze after this date
- Average first fall frostDec 250% chance of a 32°F freeze by this date
- Growing season (frost-free)283 daysmedian, 32°F threshold
- USDA hardiness zone9a20 to 25°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) | Jan 23 |
| 50% (the "average" last frost) | Feb 24 |
| 10% (safe-side: only 1 year in 10 freezes later) | Mar 14 |
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 14 |
| 50% (the "average" first frost) | Dec 2 |
| 90% (late: most years have frozen by now) | Dec 30 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 6 | Nov 21 |
| 32°F (freeze) | Feb 24 | Dec 2 |
| 28°F (hard freeze) | Feb 4 | Dec 18 |
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 Somerset
Soil temperature now
2-inch depth
74°F 55°F or warmer
24-hour average · latest 76°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Three Oaks (36 mi), EAA Field Research Park (37 mi), Strey Ranch (40 mi).
4-inch depth
76°F 55°F or warmer
24-hour average · latest 77°F, as of Oct 17, 7:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of Three Oaks (36 mi), EAA Field Research Park (37 mi), Strey Ranch (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 | 47° | Partly Cloudy | |
| Sunday | 72° | 53° | Mostly Sunny |
| Monday | 77° | 58° | Mostly Sunny |
| Tuesday | 83° | 60° | Mostly Sunny |
| Wednesday | 86° | 61° | Mostly Sunny |
| Thursday | 87° | 61° | Sunny |
| Friday | 88° | 63° | 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 78069
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: Lytle 3W, TX (NOAA GHCN-Daily ID USC00415454), elevation 722 ft, 10.9 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| Poteet, TX | 13 mi | Feb 22 | Dec 1 |
| San Antonio Kelly AFB, TX | 14 mi | Feb 22 | Dec 2 |
| San Antonio Stinson AP, TX | 16 mi | Feb 20 | Dec 3 |
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 78069?
The average (50% chance) last spring freeze of 32°F for ZIP 78069 is February 24. For a safer planting date, use March 14, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78069?
The average first fall freeze is December 2. In 1 year in 10 it comes by November 14.
What hardiness zone is 78069?
ZIP 78069 is in USDA zone 9a (20 to 25°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
Other ZIP codes in Atascosa County
78008 78011 78012 78026 78050 78052 78062 78064 78065 All Atascosa County ZIPs