Will My Pipes Freeze Tonight? Longmont CO Pipe Freeze Risk Tool
Enter tonight's forecast or your current outdoor temperature. Get a freeze risk level and a tailored prevention checklist for your Longmont home.
Longmont sits at 4,979 feet on the Colorado Front Range, where overnight lows below freezing are common from October through April, and temperatures below 10 degrees Fahrenheit occur multiple times each winter. Unprotected pipes in crawl spaces, garages, and exterior walls are the most common failure point. This tool tells you when to act and what to do before a cold night arrives.
If a pipe already froze, see the "If a pipe already froze or burst" section below the result. For burst pipe emergencies, see the blog post on what to do when a pipe bursts in your Longmont home tonight. For ongoing pipe leak detection or water line repairs, call (303) 552-3896.
Pipe Freeze Risk Calculator
24/7 burst pipe emergency response across Longmont, Boulder County, and the St. Vrain Valley.
Frequently Asked Questions
At what temperature do pipes freeze in Colorado?
Pipes in unprotected or uninsulated locations typically begin to freeze at 20 degrees Fahrenheit or below. In Longmont, the most dangerous range is below 15 degrees, which occurs multiple times each winter. Interior pipes in heated spaces do not freeze unless the heating system fails.
How long does it take for pipes to freeze in Longmont?
At temperatures between 15 and 24 degrees Fahrenheit, uninsulated pipes in a crawl space, garage, or exterior wall can freeze in 3 to 6 hours. Below 15 degrees, freezing can occur in under 2 hours. Interior pipes in heated spaces are not at risk unless the heat fails.
Does Longmont get cold enough to freeze pipes?
Yes. Longmont sits at 4,979 feet on the Colorado Front Range. January lows average 8 to 20 degrees Fahrenheit, and temperatures below 10 degrees occur multiple times each winter. The freeze season runs October through April.
How do I protect my pipes during a Longmont freeze warning?
Let cold-water faucets drip at one drip per second. Open cabinet doors under sinks on exterior walls. Keep heat at or above 55 degrees Fahrenheit even when away. Disconnect and drain garden hoses. Cover outdoor hose bibs. Know where your main water shutoff valve is.