San Antonio Freeze: Protect Your Pipes

By Ishaq Hassan. Updated October 3, 2026. 3 min read.

Short answer: San Antonio freezes are rare but damaging, as the February 2021 winter storm showed. Before a freeze, insulate pipes in attics and outside walls, cover outdoor faucets and backflow devices, disconnect hoses, and know how to shut off your main water. During a freeze, keep the heat on, open cabinet doors and drip faucets. If a pipe bursts, shut off the water and call for help.

Many San Antonio homes were built for heat, not cold. Water lines often run through attics and exterior walls, and outdoor backflow preventers sit exposed. When a hard San Antonio freeze arrives, pipes can burst quickly. This guide explains how to prepare.

Why freezes hit San Antonio homes hard

Pipes in attics and exterior walls with little insulation
Exposed outdoor faucets, irrigation and backflow preventers
Long outages during extreme cold, as in February 2021
Heat pumps that struggle in very low temperatures

Illustration of a copper pipe joint spraying water onto a stained wall — Leaking joints can soak walls and floors before anyone notices.

Before a freeze

Insulate attic and exterior wall pipes, and pipes in garages
Wrap outdoor faucets and backflow preventers with insulated covers
Disconnect and drain garden hoses
Shut off and drain irrigation systems
Find your main water shut off valve and your SAWS meter box, and make sure you can turn them
Keep a meter key or pliers handy

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During a freeze

Keep the heat on, even if you leave
Open cabinet doors under sinks on outside walls
Let faucets drip on the coldest nights
Never use a gas oven or grill to heat the home
Run generators outside, far from doors and windows

If a pipe bursts, shut off the main water valve right away, switch off power to wet areas if safe, and call a plumber and a water damage company.

Illustration of a rusty water heater leaking into a puddle on the floor — Rust streaks and water around the base mean a water heater may be failing.

After a freeze

Check pipes, the water heater and outdoor faucets for leaks as things thaw.
Watch ceilings and walls for stains, since attic pipes can burst unseen.
Dry any water within a day or two to prevent mold.
Photograph damage for your insurer.

Read our guides on frozen pipes and how to shut off your main water valve.

Illustration of a sink full of standing water that will not drain — A drain that will not empty often means a blockage further down the line.

Local help in San Antonio

Illustration of a leaking pipe dripping under a kitchen sink with a wrench and plunger nearby — Small drips under a sink can damage cabinets and floors over time.

Quick answers: san Antonio freeze

How do I protect pipes during a San Antonio freeze?

Insulate attic and outdoor pipes, cover faucets and backflow devices, keep the heat on and drip faucets.

Where is my water shut off in San Antonio?

Often inside the home where the line enters, and at the SAWS meter box near the street.

Should I drip faucets in a freeze?

Yes, on the coldest nights, especially faucets on outside walls.

Does insurance cover burst pipes after a freeze?

Sudden damage from a burst pipe is often covered if the home was heated.

Who fixes burst pipes in San Antonio?

Sifixit can connect you with local plumbing and water damage providers.

This guide covered san Antonio freeze. For more background, see the EPA’s WaterSense program, and if you need help, Sifixit can connect you with a local provider.

This guide is general information for homeowners, not professional, insurance or safety advice for your situation.

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