Frost dates for ZIP 78213 (San Antonio, 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, San Antonio Intl AP, TX (3 miles away).
- Average last spring frostFeb 2650% chance of a 32°F freeze after this date
- Average first fall frostNov 2850% chance of a 32°F freeze by this date
- Growing season (frost-free)277 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 29 |
| 50% (the "average" last frost) | Feb 26 |
| 10% (safe-side: only 1 year in 10 freezes later) | Mar 17 |
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 7 |
| 50% (the "average" first frost) | Nov 28 |
| 90% (late: most years have frozen by now) | Dec 22 |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 10 | Nov 16 |
| 32°F (freeze) | Feb 26 | Nov 28 |
| 28°F (hard freeze) | Feb 9 | Dec 13 |
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 San Antonio
Soil temperature now
2-inch depth
72°F 55°F or warmer
24-hour average · latest 74°F, as of Oct 17, 7:00 PM CDT
Measured at TexMesonet (TWDB) station EAA Field Research Park, 13 mi away. Daily averages: Thu 83°, Fri 77°.
4-inch depth
74°F 55°F or warmer
24-hour average · latest 76°F, as of Oct 17, 7:00 PM CDT
Measured at TexMesonet (TWDB) station EAA Field Research Park, 13 mi away. Daily averages: Thu 83°, Fri 78°.
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 | 46° | Partly Cloudy | |
| Sunday | 73° | 54° | Mostly Sunny |
| Monday | 77° | 59° | Mostly Sunny |
| Tuesday | 82° | 61° | Sunny |
| Wednesday | 85° | 62° | Sunny |
| Thursday | 87° | 62° | Sunny |
| Friday | 88° | 65° | 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 78213
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: San Antonio Intl AP, TX (NOAA GHCN-Daily ID USW00012921), elevation 789 ft, 3.0 miles from the ZIP's center point. NOAA completeness flag: S (standard, 24+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| San Antonio Incarnate Word, TX | 4 mi | Feb 25 | Nov 28 |
| San Antonio Kelly AFB, TX | 10 mi | Feb 22 | Dec 2 |
| San Antonio/seaworld, TX | 12 mi | Feb 18 | Dec 9 |
The average last-frost dates of these stations span 8 days, a rough guide to local variation. See data sources & methods.
Questions
When is the last frost in 78213?
The average (50% chance) last spring freeze of 32°F for ZIP 78213 is February 26. For a safer planting date, use March 17, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78213?
The average first fall freeze is November 28. In 1 year in 10 it comes by November 7.
What hardiness zone is 78213?
ZIP 78213 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 Bexar County
78002 78023 78073 78101 78109 78112 78148 78150 78152 78154 78201 78202 78203 78204 78205 78207 78208 78209 78210 78211 78212 78214 78215 78216 All Bexar County ZIPs