Frozen Pipes in Tucson: Yes, It Happens (And How to Prevent It)

Tucson gets an average of 14 to 20 nights below freezing each winter, and our coldest snaps can drop into the low 20s. That's more than enough to burst an exposed pipe. The problem is that most homes here weren't built with cold weather in mind — pipes run through uninsulated exterior walls, attics, and outdoor cabinets that work fine 350 days a year and fail on the other 15.

Why Tucson Pipes Are Especially Vulnerable

Homes in colder climates wrap pipes in insulation, bury supply lines deeper, and put shutoffs on every hose bib. Tucson construction skips most of that because it's rarely needed. The result: hose bibs, irrigation backflow preventers, pool equipment lines, water heater supply lines in garages, and pipes running through exterior block walls all sit fully exposed when a hard freeze rolls in. Slab foundations also leave under-slab supply lines protected, but anything coming up through an exterior wall is at risk.

The Pipes That Freeze First in Tucson Homes

• →Outdoor hose bibs with hoses still attached (the hose traps water against the valve)
• →Irrigation backflow preventers mounted above ground on the side of the house
• →Pool and spa equipment plumbing, especially exposed PVC
• →Water softener loops in garages or against exterior walls
• →Tankless water heaters mounted on exterior walls
• →RV hookups, outdoor kitchens, and casita supply lines

What to Do Before a Freeze Warning

When the forecast calls for temperatures below 32°F, take an hour the afternoon before. Disconnect every garden hose and drain it. Cover hose bibs with foam insulators (under $3 at any hardware store) or wrap them in old towels and a plastic bag. Wrap exposed irrigation backflow preventers with pipe insulation or rags. If you have a tankless unit on an exterior wall, make sure it's plugged in — most models have built-in freeze protection that only works with power. Open cabinet doors under sinks on exterior walls to let warm air reach the pipes.

Should You Drip Faucets?

Yes, when temperatures are forecast to drop below 28°F for more than a few hours. Pick one faucet on the farthest wall from your water heater and let it run at a pencil-lead-thin stream overnight. Moving water freezes much slower than still water. This is cheap insurance — a few cents of water versus a $2,000 burst pipe repair.

If a Pipe Freezes But Hasn't Burst

Shut off your main water valve first in case the pipe has already split and you just can't see water yet. Then open the affected faucet so water has somewhere to go as the ice melts. Apply gentle heat with a hair dryer, heat lamp, or warm towels — never a torch or open flame. Start near the faucet and work back toward the frozen section. If you can't locate the freeze, can't get water flowing, or see any sign of a leak when pressure returns, call a plumber before things get worse.

After the Freeze: What to Inspect

Once temperatures climb back into normal Tucson range, walk the property. Check hose bibs by turning them on and watching for leaks at the wall — a cracked bib often only shows when pressurized. Inspect irrigation valves, pool equipment, and any exposed copper for splits or weeping joints. Pinhole leaks from a freeze sometimes don't show up for days as ice slowly melts behind a wall, so watch your water meter for unexplained movement over the next week.