Is Your Deck Ready for Snow? Winter Prep Checklist

Colorado winters can be as beautiful as they are brutal. And while snow-dusted mountains might make for a postcard-perfect scene, your deck isn’t quite as excited about the cold. From heavy snow loads to freeze-thaw cycles, winter can be tough on outdoor structures—especially if they’re not properly prepared. If you want your deck to stay strong, safe, and good-looking come spring, a little fall prep can go a long way.

Not sure where to start? Here's your go-to checklist for winterizing your deck in the Denver Metro Area.

Clear the Deck (Literally)

Before anything else, give your deck a clean slate. Remove all furniture, planters, rugs, and accessories—anything that could trap moisture or cause discoloration during the winter months. Not only does this protect your stuff, but it gives you a better look at the condition of your deck surface.

Once it’s cleared, sweep away leaves and debris that can cause staining or mildew if left to sit all winter.

Wash It Down

Even if your deck looks clean, there’s likely dirt, pollen, and grime hiding in the boards. A gentle pressure wash or deck cleaner helps remove buildup that can trap moisture or make the surface slippery when wet or icy.

Just be sure to:

Use a cleaner that’s safe for your decking material (wood vs. composite)

Allow plenty of dry time before moving on to sealing

Inspect for Trouble Spots

Now’s the time to do a quick health check. Look for:

Cracks or splinters in wood boards

Loose nails or screws

Signs of rot or mildew

Warped planks or unstable railings

Catch these issues before snow and ice make them worse. If you spot something concerning, Centennial Custom Decks can help assess whether it needs a quick fix or a larger repair.

Seal or Stain (If Needed)

If you have a wood deck, applying a fresh sealant or weather

-resistant stain can make all the difference in winter. It creates a barrier that protects the wood from moisture intrusion, which is especially important in freeze-thaw cycles common across Denver.

Not sure if your deck needs sealing? Pour a few drops of water on the surface—if it beads up, you’re good. If it soaks in, it’s time to reseal.

Protect the Structure

Snow protection for decks isn’t just about the surface. It's also about the framing, joists, and fasteners underneath. These parts of the deck are especially vulnerable to rot and shifting when exposed to snow and ice buildup.

Make sure:

Gutter systems above or around your deck are working properly

Downspouts direct water away from the base of the deck

Underdeck drainage systems are cleared and functioning

A well-drained deck is a long-lasting deck—especially in winter.

Cover or Store What You Can

Cold weather decking maintenance also means protecting accessories and features that aren’t built to withstand snow. Cover furniture with waterproof tarps or store it indoors. Roll up rugs and take down fabric shades or umbrellas.

Pro tip: Store cushions and textiles in a weather-sealed bin under your deck—if you have dry space and proper drainage.

Make It Through Winter—Flawlessly

Winter doesn’t have to be hard on your deck. A little prevention now can save a lot of repairs later, and keep your outdoor space looking great once warmer days return.

Centennial Custom Decks is here to help you protect your deck and get it ready for whatever Colorado’s winter throws your way. Whether you need repairs, drainage solutions, or advice on winterizing composite materials, we’ve got your back. Call (720) 273-2527 today to schedule your winter prep consultation.

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