How to Drip Faucets So Your Pipes Survive the Night

By NorthBriar Editorial Team · Published Aug 12, 2026 · Reviewed per our editorial policy

That faucet dripping through a January night isn't wasted water; knowing how to drip water to keep pipes from freezing is the cheapest protection a cold-climate house gets. But most people do it half right: the wrong taps, started too late, never checked. Since the whole tactic costs pennies, it's worth doing the correct version.

Why a trickle beats a burst

Two things happen inside a dripping pipe. First, moving water resists freezing better than standing water. Not infinitely better, but enough to matter on a marginal night. Second, and more important: an open faucet relieves pressure. When ice forms a plug in a pipe, the burst usually doesn't happen at the ice; it happens downstream, where trapped water between the plug and the closed tap builds pressure with nowhere to go. An open faucet gives that pressure an exit. Ice may still form, but a vented pipe rarely splits.

That's why the American Red Cross tells homeowners to let a faucet drip to keep pipes from freezing on cold nights, and notes that even a trickle helps. The stakes on the other side of the ledger: the average water-damage-and-freezing insurance claim runs $13,954 per the Insurance Information Institute. A night of dripping costs less than the coffee you'll drink while checking it.

How to drip water to keep pipes from freezing: pick the right faucets

Not all of them, just the right ones:

• Faucets served by exposed or vulnerable pipes: pipes that run through the crawl space, garage, attic, or along an exterior wall. If a pipe froze before, its faucet drips first.
• Whichever tap sits at the far end of the run from the main's entry point. Water flowing to the far end keeps the longest possible stretch of pipe moving, and that flow is what holds freezing off along the whole route.
• Kitchen sinks on outside walls, the single most common freeze victim in otherwise-heated homes.

An interior bathroom two feet from the water heater doesn't need to run. Think of it as choosing which pipes get the protection, not turning on the house.

Hot side, cold side, or both?

The Red Cross guidance is to let cold water drip. Freezing hits the cold line first statistically, and dripping it costs nothing to heat. But the hot pipes running through the same cold cavity can freeze too, so the practical answer:

• Single-handle faucets: park the handle dead center so a little water moves through both supply lines at once.
• Two-handle faucets: a slight drip on each side.

How much water should run to keep pipes from freezing?

For an ordinary cold snap, a steady drip (distinct drops falling in a quick rhythm) does the job. When temperatures dive toward single digits, open it to a thin, unbroken stream about the width of a pencil lead. If you want the actual numbers, like gallons per night, what it costs on your water bill, and when a drip should become a stream, we've done that math in how much drip is enough.

When to start (and stop)

Don't wait for midnight instinct. The working thresholds: pipes rarely freeze above 28°F; for exposed pipes the risk zone starts once 28°F holds for four to six hours or more, a rule of thumb meteorologists use for hard freezes. Field research by the Building Research Council found uninsulated pipes in unconditioned attics begin freezing once the outside temperature falls to 20°F. So: forecast at or below 28°F for several hours means start dripping vulnerable faucets; at or below 20°F, drip without debate. The full breakdown of thresholds, including thermostat settings, is in the minimum temperature guide.

Stop when temperatures climb back above freezing and hold there, and every faucet flows normally.

The ten-minute nightly routine

1. Check the forecast for tonight's low and how long it stays below 28°F. (1 minute)
2. Swing open the sink cabinets on exterior walls in the kitchen and bathrooms; the Red Cross lists this move because it lets room warmth reach the pipes. Move any cleaners out of reach if kids or pets are around. (2 minutes)
3. Pick your taps using the rules above. (1 minute)
4. Set the drips: middle position on single-handle taps, slight drip both sides on two-handle. Checkpoint: you can hear or see a steady rhythm at each chosen faucet. (3 minutes)
5. Morning check: every dripping faucet should still be dripping. Full flow when you open it fully = the night went fine. (3 minutes)

If a drip has stopped overnight

A faucet that was dripping and now isn't is telling you ice is forming. Act now, while it's a trickle problem instead of a burst:

• Open that faucet fully and leave it open; pressure relief is the priority.
• Open the cabinet and warm the area: room heat, a hair dryer along the accessible pipe. No torches, no open flame, ever.
• If flow returns, keep a stream (not a drip) going for the rest of the cold spell.
• If the faucet is fully dead or you find a bulge, wet spot, or split: shut off the main water valve first, keep people away from water near outlets or the panel (cut the circuit at the breaker if it's safe), and call (800) 555-0173. NorthBriar connects you with licensed local plumbing partners 24/7 in freeze season; the call is free and you approve any work directly with the pro.

One more scenario worth planning for: dripping still works when the furnace doesn't, which makes it a core move when the power goes out. And if you're dripping faucets more than a few nights a winter, that's the house telling you it needs the permanent fixes in the winterization hub. Dripping is a tactic, not a plumbing strategy.