When Is the First Freeze in San Antonio, TX?
Quick Answer
The first freeze in San Antonio, TX typically arrives around November 28. There is a 10 percent chance it comes by November 7 and a 90 percent chance it has come by December 22. Finish winterizing outdoor faucets by November 7, and test the furnace by October 24. The average stretch between the last spring freeze and the first fall freeze is 277 days.
Your San Antonio winterizing calendar
Every date below is counted back from the earliest realistic freeze, November 7. Work through them in order and the pipes are safe even in an early year. If a date has already passed, do that step this weekend.
By October 10: clear the gutters and seal the gaps
Clean the gutters, caulk the window gaps, and replace a worn door sweep so heat stays in and ice doesn't build at the eaves.
By October 24: test the furnace and swap the filter
Run the heat for ten minutes on a mild day so a dead igniter or a tripped breaker shows up now, not on the first cold night. If it won't start, the furnace checklist covers the free fixes first.
By November 7: pull the hoses and drain the faucets
This is the date that matters. Unscrew every hose, close the indoor shutoff, drain each spigot, and cover it. The full routine is in how to winterize outdoor faucets.
After January 29: reverse it in spring
That is the date by which 90 percent of years have seen their last freeze. Open the indoor shutoff and check the wall behind each spigot for a split pipe before you trust it.
The numbers behind it
| Chance a freeze (32°F or lower) has happened by | First fall freeze | Last spring freeze |
|---|---|---|
| 10 percent (early year) | November 7 | March 17 |
| 50 percent (typical year) | November 28 | February 26 |
| 90 percent (late year) | December 22 | January 29 |
Source: NOAA NCEI U.S. Climate Normals 1991 to 2020, station SAN ANTONIO INTL AP (ID USW00012921, about 789 feet). The station is usually the airport, so a hilltop or a river valley across town can freeze a week earlier or later. See how Covefix uses this data.
FAQ
When is the first freeze in San Antonio, TX?
The typical first freeze in San Antonio, TX falls around November 28. There is a 10 percent chance it arrives by November 7 and a 90 percent chance it has arrived by December 22, based on NOAA 1991 to 2020 climate normals for the SAN ANTONIO INTL AP station.
When should I winterize outdoor faucets in San Antonio?
Finish by November 7. That is the earliest date a freeze has even a 10 percent chance of having already happened in San Antonio, so disconnecting hoses, draining the spigots, and fitting covers before then protects the pipes in all but the earliest years.
When is the last frost in San Antonio, TX?
The typical last spring freeze in San Antonio, TX is around February 26. Wait until after January 29, the 90 percent date, before reversing winterizing steps like re-opening an outdoor shutoff.
Guides for this season
Outdoors & Seasonal
How to Clean Gutters Without Falling Off the Ladder
Clogged gutters dump water at your foundation. Here is the safe ladder setup, the scoop-and-flush method, and the downspout test most people skip.
Time2–4 hrs Cost$0–$60 moderate
Outdoors & Seasonal
Fix a Drafty Door in an Hour (Weatherstripping That Lasts)
That draft under the front door costs real heating and AC money. Find the gaps with a flashlight, then seal them with $15 of weatherstripping and a sweep.
Time45–60 min Cost$10–$25 easy
Heating & Cooling
Furnace Not Turning On: 7 Checks Before You Call for Service
A furnace that won't start is usually a thermostat setting, tripped breaker, power switch, clogged filter, or loose blower door. Check those five first.
Time15–45 min Cost$0–$25 moderate
Heating & Cooling
How to Replace an HVAC Filter the Right Way
A dirty HVAC filter cuts airflow and raises bills. Find the size, point the arrow toward the unit, and replace it in under 10 minutes today.
Time5–10 min Cost$8–$25 easy
Outdoors & Seasonal
Seal Drafty Windows Before the First Cold Snap
Find the leak with a smoking incense stick, then match the fix to the gap. And never caulk the weep holes at the bottom of a vinyl window frame.
Time30 min–2 hrs Cost$10–$45 easy
Outdoors & Seasonal
How to Winterize Outdoor Faucets Before the First Freeze
Pull the hose, close the indoor shutoff, drain the spigot, and cover it. 15 minutes per faucet in October prevents a burst pipe in the wall in January.
Time15 min per faucet Cost$0–$15 easy
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