Most homeowners assume a hard, extended deep freeze is what causes a frozen pipe, but that's not usually how it happens in practice. A single sharp cold snap, even one that only lasts a day or two, is often enough to freeze an exposed line that was already marginal to begin with. The extended-freeze scenario matters less than most people think; the specific location of the pipe matters much more.
Pipes running through unheated crawlspaces, exterior walls, and garages are the pipes that actually freeze, almost without exception. These are locations where a pipe sits closer to outside temperatures than the rest of a home's plumbing, which stays protected by the building's general heating. A supply line running through an insulated interior wall essentially never freezes, regardless of how cold it gets outside, because it's surrounded by conditioned space on all sides.
Older homes in Fort Collins' historic neighborhoods are more exposed to this risk than newer construction, simply because insulation standards decades ago didn't anticipate today's expectations. A pipe run that was considered adequately protected when a home was built in the 1960s or 1970s often falls well short of what would be considered standard practice now.
The warning signs are worth knowing before a pipe actually splits. No water from a specific fixture is often the first sign, since a freeze blocks flow before it necessarily causes a break. Visible frost or ice on an exposed section of pipe is a clear warning sign worth acting on immediately, since a pipe under pressure from ice inside is at real risk of bursting imminently. If you notice sudden pressure loss followed by water appearing somewhere unexpected, the pipe has likely already split after freezing.
If you catch a freeze before it splits, our frozen pipe repair service uses controlled, safe thawing methods, never an open flame, which can damage the pipe or start a fire. If the pipe has already burst, the priority shifts immediately to emergency shutoff and repair. Our burst pipe repair page covers what that emergency response actually involves.
Prevention here is genuinely cost-effective. Foam pipe insulation on exposed runs costs very little compared to the cleanup after a burst, and it's a simple add-on during any other plumbing visit. For a known problem spot that's frozen before, a low-wattage heat cable is a more permanent fix than relying on insulation alone.
This risk applies just as much in LaPorte's rural and semi-rural properties, where exposed plumbing runs, sometimes serving a well pump house or an outbuilding, face even more direct exposure to Front Range winter conditions than a typical in-town home.
There's a broader preparation question worth thinking through before the first hard freeze each year rather than during it. Knowing where your main water shutoff valve is located, and confirming it actually turns freely rather than being seized from disuse, matters far more in the moment than most homeowners realize. A shutoff valve that doesn't work when you need it turns a contained freeze event into a much bigger problem.
If you're planning to be away from home for an extended period during winter, whether for travel or a seasonal second residence, leaving the heat set no lower than around 55 degrees is a reasonable baseline to keep interior pipe runs protected, even ones that wouldn't normally be at risk under everyday heating conditions. A completely unheated home during a hard cold snap puts every pipe at some level of risk, not just the usual exposed suspects.
For rental properties or homes with infrequent occupancy, this preparation question deserves extra attention, since a frozen or burst pipe can go unnoticed for days in a property nobody's regularly checking, turning a contained repair into significant water damage by the time it's discovered.
If your home has a history of the same specific spot freezing more than once, that's worth treating as a known problem requiring a permanent fix rather than an annual inconvenience to manage reactively each winter. A heat cable installed once during a repair visit typically costs far less over several winters than repeated emergency thaw calls for the same recurring location.
It's also worth doing a fall walkthrough of your entire property, not just the interior, before the first real cold snap arrives. Outdoor spigots that haven't been properly shut off and drained for winter are a related, commonly overlooked freeze risk, since the exposed section of pipe just inside the wall behind an outdoor faucet can freeze and split even when every interior pipe is perfectly protected.
Homes that have recently changed hands are worth extra attention here, since a new owner often doesn't yet know which specific spots gave the previous owner trouble in past winters. If you've just purchased a home in Fort Collins or the surrounding area, asking the previous owner directly about any past freeze issues, or having a technician do a preventive walkthrough before your first winter, is a reasonable and inexpensive way to avoid learning about a weak spot the hard way during an actual cold snap.
The overall pattern worth remembering is simple even though the specific vulnerable spots vary by home: location, not just outdoor temperature, is what actually determines freeze risk, and a few minutes of fall preparation reliably beats an emergency winter repair call.
Common Questions
Can I thaw a pipe myself?
Gentle, gradual heat on an accessible section can be reasonably safe, but never use an open flame, and call us if you're unsure or can't reach the affected area.
Do I need to worry about this every winter, or just during unusually cold snaps?
Any hard cold snap is enough for a marginal, poorly insulated line, so it's worth checking known exposed areas before winter starts each year, not just during an unusual cold event.