Pipes freeze in Fort Collins because uninsulated water lines running through crawlspaces, garages, attics and exterior walls lose heat fast once outdoor temperatures drop below about 20F, especially during our overnight wind-driven cold snaps. Prevent it by insulating those runs, disconnecting garden hoses before the first freeze, keeping the thermostat at 55F or higher, and letting a pencil-thin trickle run on the coldest nights.
Why Fort Collins is especially hard on pipes
Our climate combines two things that break pipes: sharp overnight temperature drops of 40 degrees or more, and very low humidity with steady wind that strips heat from any exposed line. A pipe in a vented crawlspace can be 30 degrees colder than the room above it.
The housing stock adds to it. Older Old Town homes often have supply lines run through uninsulated exterior walls and shallow crawlspaces, while newer builds where Timnath area homeowners live frequently have long unconditioned garage runs feeding utility sinks and hose bibs.
Where pipes actually freeze
Nearly every frozen-pipe call we run in January involves one of these locations:
- Outdoor hose bibs with a garden hose still attached.
- Supply lines in a vented crawlspace or under a cantilevered floor.
- Pipes in an unheated or partially heated garage.
- Lines running through exterior walls behind a kitchen sink on a north-facing wall.
- Attic-run lines in homes with second-floor bathrooms.
- Any line in a vacation home or rental left at a low thermostat setting.
Prevention that actually works
Before the first hard freeze, disconnect and drain every garden hose and shut off the interior valve feeding each hose bib, then open the exterior spigot to drain the stub. A connected hose traps water at the bib and splits the pipe behind the wall, and that is the single most common freeze failure we see.
Insulate every accessible line in the crawlspace, garage and attic with foam sleeves, and use heat tape rated for potable water lines on the most exposed runs. Seal crawlspace vents and any air gaps where the rim joist meets the foundation; blocking wind matters as much as adding insulation.
Keep the house at 55F minimum even when you travel, open cabinet doors under sinks on exterior walls so warm room air reaches the pipes, and on nights forecast below 10F let the farthest faucet from the meter drip. Moving water and relieved pressure are what prevent a burst.
If a pipe is already frozen
A faucet that gives only a trickle when the temperature is well below freezing means ice in the line. Leave that faucet open, because as the ice melts the water needs somewhere to go, and locate the frozen section, usually the coldest accessible run feeding that fixture.
Thaw it with a hair dryer, a heat gun on low, or towels soaked in hot water, working from the faucet end back toward the frozen section. Never use an open flame or a propane torch: it is the leading cause of plumbing-related house fires and it can flash-boil trapped water and rupture the pipe.
If you cannot reach the frozen section, or if water appears once flow returns, shut off the main immediately and get 24/7 emergency plumbing help on the way. A pipe that burst while frozen often does not reveal itself until it thaws, so a follow-up pressure test and pipe repair is worth doing before you close the wall back up.
Know where your main shutoff is
Every household member should know the location of the main water shutoff and how to close it. In most Fort Collins homes it is in the basement or crawlspace on the wall facing the street, near the meter.
A burst half-inch supply line pushes several hundred gallons an hour into your home. The difference between a drywall repair and a full restoration claim is usually how many minutes passed before someone closed that valve, and then how fast a trusted Fort Collins plumbing team can get on site.
Frequently Asked Questions
At what temperature do pipes freeze in Fort Collins?
Exposed and uninsulated pipes start to be at risk once outdoor temperatures hold below about 20F, and the risk rises sharply below 10F or when wind is driving cold into a crawlspace or garage.
Should I leave faucets dripping overnight?
On nights forecast below about 10F, yes. A pencil-thin trickle from the fixture farthest from your meter keeps water moving and relieves the pressure that actually splits a pipe.
Do you handle burst pipes after hours?
Yes. We run a 24/7 emergency plumbing line with no after-hours surcharge and carry PEX and copper repair fittings on every truck.
Need a licensed plumber in Fort Collins?
Fix Plumbing Fort Collins is available 24/7 with flat-rate quotes and same-day service across Fort Collins and Northern Colorado.