It’s warm in Golden at the moment, but that’s going to change soon. A frost-free, or “no-freeze” outdoor spigot is designed to protect your plumbing during freezing weather. But the name can be misleading.

A frost-free spigot can still freeze, split, and cause significant water damage.

In Colorado, where temperatures can change rapidly and homes experience repeated freeze-thaw cycles, understanding how these faucets work can help prevent a relatively small plumbing problem from turning into water damage, and potentially mold growth inside a wall, basement, or crawl space.

How Does a Frost-Free Spigot Work?

Unlike a traditional outdoor faucet, a frost-free spigot has a long tube extending through the exterior wall. The actual shutoff valve is located several inches inside the home, where temperatures should remain above freezing.

When you turn the faucet off, water remaining in the tube is supposed to drain out through the exterior opening.

That’s the key:

A frost-free spigot only provides freeze protection when the water can drain from it.

What Happens If the Spigot Isn’t Pitched Correctly?

A frost-free spigot should be installed with a slight downward pitch toward the exterior of the home.

If the faucet is installed level—or worse, slopes slightly toward the house—water can remain trapped inside the tube.

When temperatures fall below freezing:

Trapped water → freezes → expands → can damage or split the faucet tube.

The problem may remain completely hidden.

A freeze-damaged faucet can split inside the wall without producing an obvious leak while the faucet is turned off. The damage may not become apparent until someone turns the outdoor faucet on again.

That means the first indication of a problem could occur in the spring when someone connects a garden hose.

Unfortunately, water may then be leaking inside the wall.

A Properly Installed Spigot Can Change Over Time

Installation isn’t the only consideration.

Homes and building components move.

Seasonal soil movement, freeze-thaw cycles, foundation movement, settling, movement of exterior siding or trim, and loosened mounting hardware can potentially alter how a faucet sits in the wall.

Even a relatively small change can matter because the faucet depends upon gravity to drain properly.

A faucet that originally had sufficient outward pitch may eventually sit closer to level. If water begins remaining inside the tube, the risk of freeze damage increases.

The basic principle is simple:

If it can’t drain, it isn’t truly frost-free.

The Most Common Mistake: Leaving the Hose Attached

Even a properly installed frost-free spigot can freeze if a garden hose, splitter, timer, nozzle or other attachment prevents it from draining.

Water becomes trapped inside the faucet where it can freeze and expand.

Before freezing weather arrives, homeowners should disconnect everything attached to the spigot.

Don’t simply shut the faucet off and leave the garden hose connected.

Before Winter: A Simple Spigot Checklist

Before Colorado’s first hard freeze:

• Disconnect every garden hose. Don’t just turn the faucet off.
• Remove splitters, timers, nozzles and other attachments that could interfere with drainage.
• Look at the faucet’s angle. It should have a slight downward pitch toward the exterior.
• Turn it on and inspect for leaks around the exterior wall connection.
• Turn it off and watch it drain. Water draining immediately after shutoff is generally a good sign.
• Check the mounting flange. A loose faucet can move and change its drainage angle.
• Know where your interior water shutoff is located in case a leak occurs.
• If you’re uncertain about the installation or condition of the faucet, have a qualified plumber inspect it before freezing weather.
• Install an insulating cover during cold months – This is a cheap and effective additional layer of protection for your home

Don’t Forget About It in the Spring

Spring is when a freeze-damaged spigot may finally reveal itself.

The first time you use an exterior faucet after winter, don’t simply turn it on and walk away.

Let the faucet run while checking the interior side of the wall if it’s accessible. Look in the basement, crawl space, utility area or wherever the plumbing enters the home.

Watch for:

• Water dripping or spraying inside
• New moisture on foundation walls or framing
• Wet insulation or drywall
• Water entering a crawl space
• Unexplained damp or musty odors

If you discover water where it shouldn’t be, turn the faucet off immediately and contact a qualified plumber.

A Small Leak Can Become a Mold Problem

A damaged exterior faucet isn’t just a plumbing concern.

If a leak occurs inside a wall or crawl space, it can wet wood framing, insulation, drywall, sheathing and other building materials without being immediately visible.

If those materials remain wet, conditions can develop that support mold growth.

This is why identifying and correcting the water source is such an important part of preventing mold problems.

A slow or intermittent leak can be particularly troublesome because it may continue for weeks or months before staining, odors or other visible signs appear inside the home.

The Takeaway

“Frost-free” doesn’t mean “freeze-proof.”

These faucets rely on proper installation and drainage. Improper pitch, an attached garden hose, restricted drainage, loose mounting or movement over time can defeat the protection the faucet was designed to provide.

A few minutes spent checking outdoor faucets before winter and again when you first use them in spring can help prevent hidden water damage, costly repairs and conditions that can contribute to mold growth.