Frost dates for 78255 — San Antonio, TX
How San Antonio compares
- In 8 years out of 10, the last spring frost in San Antonio falls between February 23 and April 8, a 44-day window. The first fall frost falls between October 31 and December 4.
- The median last frost is the same as the Texas median of Mar 15.
- Its 243-day growing season is longer than 45% of the 1,316 Texas places with a regular frost season (state median 245 days).
- The last frost is typical for zone 8b, where the median is Mar 16.
- The weather station records an average of 40 nights a year at or below 32°F.
Frost probability
| Chance of frost after | Date |
|---|---|
| 90% (early) | February 23 |
| 50% (median) | March 15 |
| 10% (safe for tender plants) | April 8 |
| Chance of frost before | Date |
|---|---|
| 10% (early) | October 31 |
| 50% (median) | November 13 |
| 90% (late) | December 4 |
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 78255 — San Antonio, TX — last frost Mar 15, first frost Nov 13, zone 8b. whenisthelastfrost.com
When to plant vegetables in San Antonio, TX
| Crop | Start indoors | Transplant | Sow outdoors | Fall crop |
|---|---|---|---|---|
| Onions | Dec 21 – Jan 4 | Feb 15 – Mar 1 | — | — |
| Peppers | Jan 4 – Jan 18 | Mar 29 – Apr 12 | — | — |
| Eggplant | Jan 4 – Jan 18 | Mar 29 – Apr 12 | — | — |
| Tomatoes | Jan 18 – Feb 1 | Mar 22 – Apr 5 | — | — |
| Lettuce | Jan 18 – Feb 1 | Feb 22 – Mar 8 | Feb 15 – Mar 22 | Sep 18 – Oct 16 |
| Kale | Jan 18 – Feb 1 | Feb 15 – Mar 1 | Feb 15 – Mar 1 | Sep 4 – Sep 25 |
| Broccoli | Jan 18 – Feb 1 | Mar 1 – Mar 15 | — | Aug 7 – Aug 28 |
| Cabbage | Jan 18 – Feb 1 | Feb 22 – Mar 8 | — | Aug 7 – Aug 28 |
| Cauliflower | Jan 18 – Feb 1 | Mar 1 – Mar 15 | — | Aug 7 – Aug 28 |
| Okra | Feb 1 – Feb 15 | Apr 5 – Apr 19 | Apr 5 – Apr 19 | — |
| Basil | Feb 1 – Feb 15 | Mar 22 – Apr 5 | — | — |
| Peas | — | — | Feb 1 – Feb 22 | Aug 21 – Sep 11 |
| Spinach | — | — | Feb 1 – Feb 22 | Sep 18 – Oct 9 |
| Radishes | — | — | Feb 8 – Mar 22 | Oct 2 – Oct 23 |
| Cucumbers | Feb 15 – Feb 22 | Mar 29 – Apr 5 | Mar 22 – Apr 5 | Aug 28 – Sep 11 |
| Zucchini & Summer Squash | Feb 15 – Feb 22 | — | Mar 22 – Apr 5 | Sep 4 – Sep 18 |
| Winter Squash & Pumpkins | Feb 15 – Feb 22 | — | Mar 22 – Apr 5 | — |
| Melons & Watermelon | Feb 15 – Feb 22 | Mar 29 – Apr 12 | — | — |
| Carrots | — | — | Feb 22 – Mar 22 | Aug 21 – Sep 4 |
| Beets | — | — | Feb 22 – Mar 22 | Sep 4 – Sep 18 |
| Potatoes | — | — | Feb 22 – Mar 15 | — |
| Swiss Chard | — | — | Mar 1 – Mar 29 | Sep 4 – Sep 18 |
| Cilantro | — | — | Mar 1 – Mar 22 | Sep 18 – Oct 9 |
| Green Beans | — | — | Mar 22 – Apr 12 | Aug 28 – Sep 11 |
| Sweet Corn | — | — | Mar 22 – Apr 5 | — |
| Sweet Potatoes | — | Mar 29 – Apr 19 | — | — |
| Garlic | — | — | — | Oct 30 – Dec 4 |
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 Boerne, TX weather station, 15 km away (elevation 1,444 ft (440 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
- Helotes Mar 15 · Nov 13
- Boerne Mar 15 · Nov 13
- Bergheim Mar 15 · Nov 13
- Bulverde Feb 26 · Nov 28
- Pipe Creek Mar 15 · Nov 13
- Mico Feb 18 · Dec 9
- Rio Medina Feb 18 · Dec 9
- Waring Mar 15 · Nov 13
Frequently asked questions
When is the last frost in San Antonio, TX?
The median last spring frost in San Antonio, TX is March 15. There is still about a 10% chance of frost after April 8, 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 13, with about a 10% chance of frost before October 31.
How long is the growing season in San Antonio, TX?
About 243 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 8b.