What to Do the Morning After a Hard Freeze (Checklist)

TL;DR: The morning after a hard freeze, check your water meter before you turn on any faucet — if it's spinning with every tap off, you have a hidden leak or burst pipe. Work in this order: water meter, outdoor spigots, water heater, then attic and roofline. Most freeze damage shows up in copper pipe within 1-3 hours of temperatures dropping below 20°F, so a 15-minute walkthrough can catch a problem before it floods a floor.

_Last reviewed: October 2026 · 7 min read_

Your thermometer said 18°F overnight and now you're not sure what to check first. A burst pipe in a wall can dump 10 gallons a minute, so the order you inspect things actually matters. Here's the walkthrough, in the sequence that catches the expensive problems before they get worse.

Okoniq Property Hub lets you log freeze events and photo-document any damage right after a cold snap, so you have a dated record if you need to file an insurance claim later.

How do you know if a pipe froze or burst overnight?

Check your water meter before you touch any faucet. Turn off every tap and appliance that uses water, then look at the meter's leak indicator (usually a small red or black triangle). If it's moving, water is flowing somewhere in the system even though nothing's turned on, which means a crack or split pipe.

Next, run water at the lowest-pressure fixture in the house, usually a bathroom sink on an exterior wall. No flow or a trickle that smells musty often means a frozen section upstream. A sudden drop in water pressure throughout the house, paired with a wet spot on a ceiling or wall, means a pipe has likely already burst and is leaking inside a cavity. If you see staining or bulging drywall, shut off the main water valve immediately and call a plumber before you do anything else.

Copper pipe can split in as little as 1 hour once water inside it freezes and expands, since ice takes up about 9% more volume than liquid water. PEX and PVC are more flexible and tend to survive short freezes better, but fittings and joints are still vulnerable regardless of pipe material.

What should you check outside first?

Start with hose bibs, outdoor spigots, and any exposed supply lines before you check inside. Disconnect garden hoses if you haven't already — a hose left attached traps water in the spigot and is the single most common cause of a split outdoor faucet. Turn the spigot on for a few seconds; if water sputters, drips unevenly, or doesn't flow at all, the line may be frozen or cracked inside the wall.

Check any exposed pipe under a crawl space vent or in an unheated garage. These are the next most likely failure points because they're outside the building's heated envelope. If your home has a well, check the pressure tank and pitless adapter at the wellhead, since a frozen adapter can crack silently and leak underground without you noticing until spring.

While you're outside, look at your foundation for new cracks, since freeze-thaw cycles are one of the most common causes of hairline cracks widening overnight. A crack that's grown more than 1/8 inch since you last checked is worth photographing and watching over the next few weeks.

How do you safely thaw a frozen pipe?

Apply gentle heat at the coldest point first, never an open flame. A hair dryer on low, an electric heating pad wrapped around the pipe, or towels soaked in hot water all work. Start thawing at the end closest to the faucet and work backward toward the blockage, that way the ice has somewhere to go as it melts instead of building pressure behind a plug.

Never use a propane torch directly on a pipe. It's the leading cause of house fires during freeze events, especially near wood framing, insulation, or old newspaper used as historic insulation. If the frozen section is behind a wall or you can't reach it, call a plumber rather than opening drywall yourself.

| DIY Thaw | Call a Plumber | |---|---| | Pipe is visible and accessible | Pipe is inside a wall or ceiling | | No signs of cracking or bulging | Water meter indicator is spinning | | Single fixture affected | Multiple fixtures affected at once | | Cost: $0-30 in supplies | Cost: $150-500+ for emergency service |

What else needs checking after a freeze?

Your water heater, HVAC system, and roofline all take a hit during a hard freeze and are easy to overlook while you're focused on pipes. Check around the base of your water heater for pooling — pooling water under a water heater after a freeze often means the temperature-pressure relief valve discharged due to a pressure spike, or a fitting cracked.

Look at your gutters and downspouts for ice dams. A ridge of ice at the roof edge can back water up under shingles, and gutters that weren't cleared before winter are far more prone to this. If you see icicles longer than 12 inches hanging uniformly along one section of roofline, that's usually an ice dam forming, not just normal runoff.

Finally, check your outdoor HVAC unit. If it was running during the freeze, ice buildup on the coils is normal and will melt on its own within a few hours once temperatures rise above freezing. But if ice is still there by afternoon, or the unit won't start, that's worth a service call rather than forcing it.

How do you prevent this from happening again?

Insulate exposed pipes, disconnect hoses every fall, and know where your main shutoff is before the next freeze warning. Foam pipe sleeves cost about $1-2 per linear foot and take an afternoon to install on exposed basement or crawl space pipe. Knowing your home's main systems and shutoffs before an emergency saves precious minutes when a pipe does burst.

Letting a trickle of water run from the faucet farthest from your main line during the next hard freeze warning keeps water moving and prevents it from sitting still long enough to freeze. It adds maybe a dollar to your water bill for the night, which is far cheaper than a plumber's emergency rate.

FAQ

How long does it take for a pipe to freeze solid?

In a typical unheated space, a 3/4-inch copper pipe can freeze solid in 6-8 hours once the surrounding air stays below 20°F, though thinner pipes or ones with less insulation can freeze faster.

Will my homeowners insurance cover freeze damage?

Most standard policies cover sudden pipe bursts from freezing, but many exclude damage if the home was unoccupied and unheated, or if you failed to take reasonable precautions like leaving heat on. Check your specific policy language and call your agent before assuming coverage.

Is it normal for outdoor faucets to not work after a freeze even if they're not broken?

Yes. A frost-free spigot can take a few hours to fully thaw even if undamaged, since the actual shutoff valve sits several inches inside the wall where it's warmer. Give it until afternoon before assuming it's cracked.

What temperature actually counts as a "hard freeze"?

Most meteorologists define a hard freeze as temperatures dropping to 25°F or below for at least a few hours, cold enough to damage plumbing, pipes, and many landscape plants, as opposed to a light frost around 32-36°F.

Should I shut off my water main before a freeze warning?

Only if you're leaving the property vacant. For an occupied home, shutting off the main and draining lines is more disruptive than helpful; instead, keep the heat at 55°F or higher and let faucets drip as needed.

This is educational information, not plumbing or insurance advice. Call a licensed plumber if you suspect a hidden leak or burst pipe, and check with your insurance agent about freeze-damage coverage before you need it.