Frost dates for 78208 — San Antonio, TX
How San Antonio compares
- In 8 years out of 10, the last spring frost in San Antonio falls between January 28 and March 19, a 50-day window. The first fall frost falls between November 7 and December 21.
- The median last frost is 18 days earlier than the Texas median of Mar 15.
- Its 276-day growing season is longer than 86% of the 1,316 Texas places with a regular frost season (state median 245 days).
- The last frost is 6 days earlier than the zone 9a median of Mar 3. Hardiness zones measure winter cold, not season length, so use these dates rather than a zone 9a chart.
- The weather station records an average of 22 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | January 28 |
| 50% (median) | February 25 |
| 10% (safe for tender plants) | March 19 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | November 7 |
| 50% (median) | November 28 |
| 90% (late) | December 21 |
Frost here means 32°F (0°C). A median date means half of years have their last frost earlier and half later.
Planting calendar for San Antonio, TX
Frost dates for 78208 — San Antonio, TX — last frost Feb 25, first frost Nov 28, zone 9a. whenisthelastfrost.com
When to plant vegetables in San Antonio, TX
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 3 – Dec 17 | Jan 28 – Feb 11 | — | — |
| Peppers | Dec 17 – Dec 31 | Mar 11 – Mar 25 | — | — |
| Eggplant | Dec 17 – Dec 31 | Mar 11 – Mar 25 | — | — |
| Tomatoes | Dec 31 – Jan 14 | Mar 4 – Mar 18 | — | — |
| Lettuce | Dec 31 – Jan 14 | Feb 4 – Feb 18 | Jan 28 – Mar 4 | Oct 3 – Oct 31 |
| Kale | Dec 31 – Jan 14 | Jan 28 – Feb 11 | Jan 28 – Feb 11 | Sep 19 – Oct 10 |
| Broccoli | Dec 31 – Jan 14 | Feb 11 – Feb 25 | — | Aug 22 – Sep 12 |
| Cabbage | Dec 31 – Jan 14 | Feb 4 – Feb 18 | — | Aug 22 – Sep 12 |
| Cauliflower | Dec 31 – Jan 14 | Feb 11 – Feb 25 | — | Aug 22 – Sep 12 |
| Okra | Jan 14 – Jan 28 | Mar 18 – Apr 1 | Mar 18 – Apr 1 | — |
| Basil | Jan 14 – Jan 28 | Mar 4 – Mar 18 | — | — |
| Peas | — | — | Jan 14 – Feb 4 | Sep 5 – Sep 26 |
| Spinach | — | — | Jan 14 – Feb 4 | Oct 3 – Oct 24 |
| Radishes | — | — | Jan 21 – Mar 4 | Oct 17 – Nov 7 |
| Cucumbers | Jan 28 – Feb 4 | Mar 11 – Mar 18 | Mar 4 – Mar 18 | Sep 12 – Sep 26 |
| Zucchini & Summer Squash | Jan 28 – Feb 4 | — | Mar 4 – Mar 18 | Sep 19 – Oct 3 |
| Winter Squash & Pumpkins | Jan 28 – Feb 4 | — | Mar 4 – Mar 18 | — |
| Melons & Watermelon | Jan 28 – Feb 4 | Mar 11 – Mar 25 | — | — |
| Carrots | — | — | Feb 4 – Mar 4 | Sep 5 – Sep 19 |
| Beets | — | — | Feb 4 – Mar 4 | Sep 19 – Oct 3 |
| Potatoes | — | — | Feb 4 – Feb 25 | — |
| Swiss Chard | — | — | Feb 11 – Mar 11 | Sep 19 – Oct 3 |
| Cilantro | — | — | Feb 11 – Mar 4 | Oct 3 – Oct 24 |
| Green Beans | — | — | Mar 4 – Mar 25 | Sep 12 – Sep 26 |
| Sweet Corn | — | — | Mar 4 – Mar 18 | — |
| Sweet Potatoes | — | Mar 11 – Apr 1 | — | — |
| Garlic | — | — | — | Nov 14 – Dec 19 |
Dates come from the median frost dates and common extension-service timing. Adjust for your soil temperature, microclimate and the varieties you grow.
About these dates
Based on 1991–2020 NOAA climate normals for the San Antonio Incarnate Word, TX weather station, 4 km away (elevation 699 ft (213 m)).
ZIP codes in San Antonio: 78201 78202 78203 78204 78205 78206 78207 78208 78209 78210 78211 78212 78213 78214 78215 78216 78217 78218 78219 78220 78221 78222 78223 78224 78225 78226 78227 78228 78229 78230 78231 78232 78233 78235 78237 78238 78239 78240 78241 78242 78243 78244 78245 78246 78247 78248 78249 78250 78251 78252 78253 78254 78255 78256 78257 78258 78259 78260 78261 78263 …
Frost dates near San Antonio
- Jbsa Ft Sam Houston Feb 25 · Nov 28
- Jbsa Lackland Feb 25 · Nov 28
- Converse Feb 21 · Dec 5
- Universal City Feb 21 · Dec 5
- Adkins Feb 21 · Dec 5
- Schertz Feb 21 · Dec 5
- Elmendorf Feb 20 · Dec 3
- Saint Hedwig Feb 21 · Dec 5
Frequently asked questions
When is the last frost in San Antonio, TX?
The median last spring frost in San Antonio, TX is February 25. There is still about a 10% chance of frost after March 19, so wait until then to plant frost-tender crops like tomatoes and peppers.
When is the first frost in San Antonio, TX?
The median first fall frost is November 28, with about a 10% chance of frost before November 7.
How long is the growing season in San Antonio, TX?
About 276 days between the median last spring frost and first fall frost.
What planting zone is San Antonio, TX?
San Antonio, TX is in USDA hardiness zone 9a.