Frozen Pipes in Flagstaff: What To Do Right Now
Right now matters more than how it happened — here’s the order to do things in.
Flagstaff has recorded lows as cold as -30°F, and pipes in exterior walls, crawl spaces, and unheated rooms are the first to go. It’s even more common in homes that sit empty through the winter — and with vacation and second homes making up a large share of properties around Flagstaff, that’s a real pattern, not a rare one.
- Shut off water first
- Never use an open flame
- Burst vs just frozen
- (928) 438-0436
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What to do right now
1. Shut off the water, then open the taps
Find your main shut-off valve and turn it off first — this limits flooding if the pipe has already split or splits while thawing. Then open both the hot and cold taps connected to the frozen section to relieve pressure and let water flow once it starts to thaw.
2. Apply gentle heat, from the faucet end in
A hair dryer, heating pad, warm towels, or a space heater pointed at the pipe all work. Start thawing from the end nearest the faucet and work back toward the frozen section — this lets melting water escape instead of building pressure behind a plug of ice.
How bad is it?
Just frozen, no visible damage
No cracks, no leaking, water just isn’t flowing. Safe to thaw yourself with gentle heat as above — never with an open flame or torch, which is a real fire risk and can damage the pipe further.
Cracked, leaking, or already burst
Visible cracks, unexpected water, or standing water nearby mean it’s already failed. Shut the water off, don’t attempt to thaw it yourself, and call — this is the kind of damage that gets worse fast once it’s thawed.
See Water Damage Repair →You’re away from the property
Second homes and vacation rentals left unheated over winter are exactly where this happens most. A scheduled property check through a cold snap catches a frozen line before it becomes a flooded one.
See Property Checks →FAQ
How cold does it have to get for pipes to freeze in Flagstaff?
It depends on insulation and location, but Flagstaff has recorded lows down to -30°F, and any stretch of hard freeze puts exterior-wall and crawl-space pipes at risk, especially in an unheated or empty house.
Should I use a blowtorch to thaw a pipe faster?
No. An open flame or torch is a serious fire hazard and can also damage the pipe itself. Gentle, even heat — a hair dryer, heating pad, or warm towels — is the safe way to do it.
How do I know if a pipe has already burst?
Look for visible cracks or splits in the pipe, water leaking or pooling nearby, or a sudden drop in water pressure once you try to run the tap. Any of those means stop trying to thaw it yourself and call.
What if I can’t find where the pipe is frozen?
That’s a good reason to call rather than keep guessing — pipes inside walls or underground need the kind of tools and experience a quick DIY check won’t have.
How do I stop this from happening again?
Keep the house above freezing even when it’s empty, insulate exposed pipes in crawl spaces and exterior walls, and if the home sits vacant for stretches, a scheduled winter check during cold snaps is the cheapest insurance against this.
Pipe already burst, or not sure?
Shut off the water and call (928) 438-0436 — we’ll walk you through it and get there fast.
Call (928) 438-0436