How do you winterize an outdoor faucet (hose bib)?
Short answer: Disconnect and drain the garden hose. Close the indoor shutoff valve that feeds the faucet. Open the outdoor faucet so the line drains, open the bleeder cap on the shutoff if it has one, and leave the outdoor valve open all winter. Frost-free sillcocks still need the hose removed, or trapped water can burst them inside the wall.
Why do outdoor faucets burst in winter?
Water expands when it freezes. Ice is less dense than liquid water, so the same mass takes up about 9% more space.
| Quantity | Value |
|---|---|
| Density of water near 32°F | about 1.000 g/cm³ |
| Density of ice | about 0.917 g/cm³ |
| Volume change on freezing | 1 / 0.917 = 1.09, or about 9% more |
A short pipe sealed at both ends has nowhere for that extra volume to go. Pressure builds until the pipe or valve body splits. The American Red Cross names outdoor hose bibs among the pipes that freeze most often.
Standard hose bib vs. frost-free sillcock
| Feature | Standard hose bib | Frost-free sillcock |
|---|---|---|
| Where the valve seat sits | At the faucet, outside the wall | At the end of a long stem, inside the heated space |
| Body length | Short, a few inches | Long barrel that runs through the wall (Arrowhead’s 490 Series comes in 4 to 14 inch lengths) |
| Water left in the outdoor part after shutoff | Yes, unless the line is drained | Drains out the spout if installed correctly |
| Fails if a hose is left on | Yes | Yes |
How a frost-free sillcock works
A frost-free (frost-proof) sillcock has a long barrel that runs through the wall. The handle outside turns a stem that closes a valve deep inside. Arrowhead Brass describes these faucets as “shutting-off flow at the heated space inside the wall.”
After you shut it off, the water left in the barrel should run out the spout. That only works if the faucet tilts down toward the outside. Arrowhead Brass says it must be “installed at a slight downward angle toward the spout.” A level or upward-tilted faucet holds water and can freeze.
Why a hose still breaks a frost-free faucet
A connected hose keeps the spout sealed. The barrel cannot drain, and water sits in the part that runs through the cold wall. Arrowhead Brass warns that water freezing back through a hose into the faucet can push pressure past what the copper tubing can hold, and it bursts. Its instruction is plain: “REMOVE HOSE IN FREEZING WEATHER.”
How to winterize an outdoor faucet, step by step
- Disconnect the hose. Remove the hose and any splitter, timer, or nozzle. Drain the hose and store it out of the weather.
- Find the indoor shutoff valve. It is usually in the basement or crawl space, on the pipe heading to the outside wall.
- Close the indoor shutoff. Turn it fully clockwise (for a gate or globe valve) or a quarter turn across the pipe (for a ball valve).
- Open the outdoor faucet. Let the water in the line drain out until it stops.
- Open the bleeder cap, if there is one. Many shutoffs have a small brass cap on the side. Put a bucket under it and unscrew it. Air enters, and the trapped water drains. Replace the cap once dripping stops.
- Leave the outdoor faucet open. This follows the Red Cross advice. Any water left behind has room to expand.
For a frost-free sillcock with no separate indoor shutoff, remove the hose and close the faucet. Confirm some water drains from the spout right after shutoff. If nothing drains, the slope may be wrong. A plumber can check it.
For whole-house prep, see the winterize house checklist. If you also store outdoor equipment, see how to winterize a lawn mower.
Do insulated faucet covers work?
Insulated faucet covers slow heat loss and can help in a short cold snap. They add no heat, so a long freeze still gets through.
Treat a cover as a backup, not a substitute. Drain the line first, then add the cover. Never put a cover over a faucet with a hose still attached.
How to tell if a frost-free sillcock burst
A burst frost-free sillcock often hides until spring. The split is inside the wall, so nothing leaks until you first open the faucet. Watch for:
- Weak flow at the spout while the faucet is fully open
- Water dripping or spraying inside the basement, crawl space, or wall cavity
- Damp drywall, ceiling stains, or puddles near where the faucet enters the house
Arrowhead Brass notes this kind of failure “will cause leaks within the wall and can cause considerable damage.” If you see any sign, shut the faucet and the indoor valve right away.
How do you turn an outdoor faucet back on in spring?
Wait until overnight freezes are over in your area.
- Close the outdoor faucet.
- Make sure the bleeder cap on the indoor shutoff is tight.
- Open the indoor shutoff slowly.
- Have someone watch the indoor pipe and wall area for leaks.
- Open the outdoor faucet and check the flow. Look again inside for drips.
If a pipe froze anyway, the frozen pipes guide covers safe thawing. The Red Cross advises against open flames, such as a blowtorch, for thawing pipes.
Quick answers
Do I need to turn off outdoor faucets in winter? Yes, if your area gets freezing weather. Close the indoor shutoff, drain the line, and leave the outdoor faucet open.
Should I leave the outdoor faucet open or closed in winter? Open, once the indoor shutoff is closed. The Red Cross says this lets remaining water expand without breaking the pipe.
Do frost-free faucets need to be winterized? Yes, at least partly. You must remove the hose so the barrel can drain. Closing an indoor shutoff, if you have one, adds protection.
Can I leave a hose connected to a frost-free spigot? No. A connected hose traps water in the barrel, which can freeze and split it inside the wall.
Are faucet covers enough by themselves? No. Covers slow heat loss but add no heat. Use them after draining, not instead of it.