Austin plumbing is built for a mild climate, not sustained cold, so a hard freeze finds the weak spots fast. The supply lines most likely to split are the ones running through an unheated garage, along an exterior wall, or under a house with a crawl space. Winter Storm Uri showed what happens when thousands of these runs freeze at once across the city.
Find the Exposed Supply Lines
Walk the house and note where pipes leave conditioned space. A supply line crossing an unheated garage in Circle C Ranch, a run under a pier-and-beam house near Hyde Park, or anything tucked against an exterior wall in Travis Heights is a candidate. These are the pipes without the buffer of heated air on both sides, and they freeze first.
Shut Off Every Hose Bib
Every hose bib around the house should lose its garden hose before the freeze warning goes out, not during it. A hose bib without its own shut-off valve holds water right up to the wall, and that water has nowhere to expand except through the fitting. Disconnecting the hose lets any leftover water drain instead of sitting there overnight.
Open the Cabinets Under Sinks
Any kitchen or bathroom sink set against an exterior wall should have its cabinet doors open on a hard freeze night. This is true from Rosedale to South Lamar. The pipe under that sink sits closer to outside air than pipes running through interior walls, and warm room air reaching the cabinet is often the difference between holding and splitting.
Skip the Deep Thermostat Setback
A house left empty during a freeze still needs its thermostat holding a normal temperature, not a deep setback to save on the bill. Once interior wall temperatures fall far enough, the pipes inside those walls are exposed to the same cold as the ones outside. This matters as much in a Mueller townhome as it does in a house near Jollyville.
Locate the Main Shut-Off Valve
Every Austin homeowner should know exactly where the water main shut-off valve sits before a freeze arrives, not while water is spreading across a slab foundation. It's usually near the water meter at the front of the property. Finding it now, in daylight, with no water running, saves the frantic search later when a pipe has already given way.
Let a Faucet Drip Overnight
A dripping tap costs little and does real work: moving water resists freezing far better than still water sitting in a line. In Austin, that matters most for supply lines run through an unheated garage or along an exterior wall in older Travis Heights or Rosedale homes, where insulation was never built for sustained cold like a hard freeze brings.
Insulate Pipes Before the Warning
Pipe insulation sleeves and heat tape belong on exposed runs in a crawl space, garage, or attic before winter starts, not the afternoon a freeze warning is issued. This is cheap, physical work: wrap the pipe, cover the joints, done. Waiting until the forecast turns cold means competing with every other homeowner in Austin for the same hardware.
Why This Catches Austin Off Guard
Austin homes weren't built to the same pipe protection standard as a house in a place with a real winter, because a real winter isn't the normal condition here. January's average low sits around 41°F, so a hard freeze is the exception, not the rule, and exposed runs that would never survive a Midwest winter were never insulated to begin with.
Checking the House Afterward
Once the freeze warning lifts and temperatures climb back above freezing, walk the property before assuming nothing happened. Check the hose bib connections outside, look under sinks along exterior walls, and glance at crawl space vents if the house sits on pier and beam near older sections of Hyde Park or Clarksville.
The Short Version
Before a freeze warning hits Austin, walk the house once. Disconnect hose bibs and drain the line, since the exposed fitting freezes before anything inside a wall. Check crawl space vents on older pier-and-beam homes and close them if they open to outside air. In an unheated garage, wrap any exposed pipe with insulation or heat tape and know where the shut-off valve sits. Then let a faucet on an exterior wall drip through the night, since moving water in the supply line resists freezing far better than water sitting still.
When Preparation Isn't Enough
None of this guarantees a pipe holds, since even a well-insulated home near Mueller or Windsor Park can still lose a line in a severe enough snap, the kind Winter Storm Uri brought to Austin in February 2021. If a supply line does split once the ice sets in, that's a separate problem with its own fix.
Dealing with this in your home?
Austin's clay soil expands after rain and pulls back tight in a hard freeze, so a post-tension slab near Zilker can crack years after the pour. Add Hill Country storms that dump inches in an hour, and Shoal Creek pushes water toward homes that never flooded before.
