Will My Pipes Freeze Tonight? Boulder CO Pipe Freeze Risk Tool

Pipes in exposed or uninsulated locations, such as crawl spaces, exterior walls, and outdoor hose bibs, are at risk when temperatures drop below 25 to 28 degrees F and stay there for several hours. Boulder regularly reaches those temperatures from November through March. At elevations in the foothills and in neighborhoods near the Flatirons, overnight lows can be 5 to 10 degrees colder than the valley floor.

At temperatures between 25 and 32 degrees F, exposed pipes may freeze after 6 to 10 hours. Between 10 and 24 degrees F, crawl space and exterior wall pipes can freeze in 2 to 5 hours. Below 10 degrees F, unprotected pipes can freeze within 1 to 2 hours. Boulder's 5,430-foot elevation means these thresholds are regularly crossed from December through February.

Yes. Boulder sits at 5,430 feet on the Front Range, where temperatures below 0 degrees F occur regularly in December, January, and February. The Chinook thaw-refreeze cycle, where temperatures rise sharply then drop overnight, is particularly dangerous because pipes that begin to thaw can refreeze quickly. Homes with crawl space construction, common in Boulder's older neighborhoods, are the most frequent failure point.

Shut off the main water valve immediately. Open a cold-water faucet to relieve pressure in the system. Use a hair dryer, heating pad, or warm towels on the frozen section if you can locate it. Never use an open flame. Document damage with photos for your insurance claim. Then call a licensed plumber at (303) 552-3896 for emergency repair and leak detection to assess the full extent of damage.