Do Frozen Pipes Always Burst?

Frozen pipes don’t automatically burst, but the risk is very real — especially in Denver and the surrounding Front Range, where temperatures can drop quickly and stay below freezing for extended periods.

When water freezes inside a pipe, it expands. That expansion increases pressure inside the pipe, particularly between the ice blockage and a closed faucet or valve. If the pressure becomes too great, the pipe can crack or burst. In many cases, the pipe actually breaks after the ice begins to thaw, when water flow resumes and escapes through weakened areas.

Whether a frozen pipe bursts depends on several factors:

• Pipe material: Copper and CPVC pipes are more likely to burst than PEX, which can expand slightly.
• Location of the pipe: Pipes in exterior walls, crawl spaces, attics, garages, and unheated commercial spaces are more vulnerable.
• How long the pipe stays frozen: Denver cold snaps that last several days increase the risk significantly.
• Water pressure: Higher pressure puts more stress on frozen sections.

For Denver-area homes and businesses, sudden temperature swings are a major concern. A pipe may freeze overnight during a cold front, then thaw quickly during a sunny afternoon, creating the perfect conditions for a delayed burst and unexpected water damage.

If you suspect a pipe is frozen, acting quickly can help prevent a rupture. Keeping faucets slightly open, warming the affected area safely, and calling a professional before thawing causes damage can make a big difference.