Denver Homeowners · Updated 2026
The One Mistake That Causes Burst Pipes in Denver Winters
Denver's freeze-thaw cycle bursts pipes every winter — and one common homeowner habit causes most of them. Here's the fix, plus what to do if a pipe lets go.
The mistake: treating a warm afternoon like the all-clear
Denver winters are unusual: 60°F on Tuesday, 8°F on Thursday. That whiplash is exactly what kills pipes. The most common mistake isn't forgetting to winterize entirely — it's disconnecting protection too early or partially: unhooking the hose but leaving the exterior bib un-drained, opening crawlspace vents on a warm week, or dialing the thermostat way down before a trip because the forecast looked mild.
Water expands about 9% when it freezes. A single overnight hard freeze inside an unprotected line generates enough pressure to split copper and PEX alike — and the flood usually starts hours later, during the thaw, often while nobody's home.
The 30-minute fix
- Drain and insulate every exterior bib — and leave foam covers on until April. Chinook weeks don't count.
- Insulate pipes in unheated spaces: garage, crawlspace, attic runs. Foam sleeves cost a few dollars a stick.
- Never set the thermostat below 55°F, even when traveling — and open cabinet doors on exterior walls during cold snaps.
- Know your main shutoff before you need it. In most Denver homes it's in the basement near the front foundation wall.
If a pipe bursts anyway
Shut the main immediately, open faucets to relieve pressure, kill electricity to affected rooms if water is near outlets, and start photographing everything for your insurance claim. Then get professional water extraction moving fast — drywall and flooring that stay wet more than a day or two start growing mold.
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