Frost Dates for San Antonio, TX
In San Antonio, TX, the average last spring frost is around Feb 25 and the average first fall frost around Nov 28, for a growing season of about 277 days. For frost-tender plants, wait until Mar 19, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the San Antonio Incarnate Word, TX weather station, 3 miles away, elevation 700 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | Mar 19 | Nov 7 |
| 20% | Mar 10 | Nov 14 |
| 30% | Mar 5 | Nov 18 |
| 40% | Mar 1 | Nov 24 |
| 50% | Feb 25 | Nov 28 |
| 60% | Feb 20 | Dec 1 |
| 70% | Feb 14 | Dec 5 |
| 80% | Feb 5 | Dec 11 |
| 90% | Jan 28 | Dec 21 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | Mar 10 | Nov 16 |
| Frost / freeze (32°F) | Feb 25 | Nov 28 |
| Hard freeze (28°F) | Feb 5 | Dec 15 |
Planting calendar for San Antonio
Transplant Mar 4 – Mar 18
Transplant Mar 11 – Mar 25
Transplant Mar 11 – Mar 25
Transplant Mar 4 – Mar 18
Sow or transplant Mar 4 – Mar 18
Sow or transplant Mar 4 – Mar 18
Sow or transplant Mar 11 – Mar 25
Sow or transplant Jan 28 – Feb 11
Fall sowing Oct 3 – Oct 31
Fall sowing Oct 3 – Oct 24
Fall sowing Sep 19 – Oct 3
Sow or transplant Jan 28 – Feb 11
Fall sowing Sep 19 – Oct 17
Transplant Feb 11 – Feb 25
Fall sowing Sep 5 – Sep 19
Transplant Feb 4 – Feb 18
Fall sowing Sep 5 – Sep 19
Fall sowing Sep 5 – Sep 19
Fall sowing Oct 17 – Nov 7
Fall sowing Sep 19 – Oct 3
Plant Jan 28 – Feb 11
Based on the average last frost (Feb 25) and first frost (Nov 28). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.