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San Antonio, Texas frost dates

Average last spring frost: February 26. Average first fall frost: November 28. That gives a growing season of about 277 days. For frost-tender plants, a safer planting date is March 17, after which a freeze happens in only 1 year in 10.
Last frost (50%)
Feb 26
1-in-10 risk after Mar 17
First frost (50%)
Nov 28
1-in-10 risk before Nov 7
Growing season
277 days
median frost-free days
Hard freeze (28°F)
Feb 9
median last 28°F in spring

Frost risk by date

Chance of frostSpring: frost afterFall: frost before
90%January 29December 22
70%February 16December 6
50%February 26November 28
30%March 6November 20
10%March 17November 7

Read the spring column like this: there is a 10% chance of a 32°F freeze after March 17. These are NOAA probabilities for the San Antonio International Airport weather station (USW00012921, elevation 241 m), 1991–2020.

San Antonio vegetable planting calendar

Dates count from the 50% last-frost date (February 26). For tomatoes, peppers and other frost-tender crops, waiting until the 10% date (Mar 17) is the cautious choice.

CropStart seeds indoorsPlant out
BeansFeb 5Mar 5 (usually sown directly in the garden)
BroccoliDec 18Jan 29
Brussels sproutsDec 18Jan 29
CabbageDec 11Jan 22
CauliflowerJan 1Feb 12
Sweet cornJan 29Feb 26 (usually sown directly in the garden)
CucumbersFeb 12Mar 5
KaleDec 11Jan 22
LeeksNov 13Jan 22
LettuceJan 8Feb 12
MelonsFeb 19Mar 12
OnionsNov 6Jan 15 (from seed; sets and transplants go out at the same time)
PeasJan 1Jan 29 (usually sown directly in the garden)
PeppersJan 15Mar 12
SquashFeb 19Mar 12
TomatoesJan 1Feb 26

Offsets from Oregon State University Extension's seed-starting table. "Plant out" means transplant, or sow directly for crops usually grown from seed.

Fall frost and season extension

The first fall freeze usually arrives around November 28. There's a 1-in-10 chance it comes before November 7. Harvest tender crops such as basil, tomatoes, peppers and squash before then, or cover them on cold nights. Cool-season crops like kale, cabbage and Brussels sprouts handle light frost, and often taste sweeter after it. A hard freeze (28°F) typically comes around December 13.

Nearby cities

CityLast frost (50%)First frost (50%)Distance
Austin, TXMar 12Nov 16~105 km
Houston, TXFeb 13Dec 9~306 km
Dallas, TXMar 8Nov 24~398 km
Shreveport, LAMar 9Nov 18~552 km
Lubbock, TXApr 4Nov 2~558 km
Oklahoma City, OKApr 4Nov 2~654 km

More: all Texas frost dates