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Staining or sealing a cedar deck or fence is highly recommended to extend its lifespan and protect it from the elements. While cedar is naturally resistant to mold and mildew, it is not impervious to damage from moisture, sun exposure, splintering, fading, and rot over time. Applying a protective finish creates a shield that preserves the wood's strength and appearance, potentially extending its life by five to 10 years.

When choosing a finish, it's helpful to understand the difference between a sealer and a stain. A sealer sits on top of the wood, whereas a combination stain and sealer soaks into the top layer. Because it penetrates the wood, a stain generally offers better protection against UV damage and rot and lasts significantly longer. For the best results that also preserve the wood's natural color, consider using a near-translucent stain.

To maintain protection, plan on reapplying the stain or sealer every two to three years, either as a DIY project or by hiring a professional.

Moisture and rot are the largest threat to wooden fences. Stain can help your wood fence last 15 to 20 years, but only if you choose a stain with waterproofing qualities or add a sealant. Oil-based stains create a thicker moisture barrier than water-based stains, though both are mold and mildew resistant. You’ll generally need to re-stain your fence every one to eight years to get full protection.

The best time to stain a fence is when the weather is dry and temperatures are between 50 and 90 degrees Fahrenheit. Late spring, early summer, and fall are typically the best seasons for this project. You should avoid staining during very hot weather, like in the middle of summer, or when it is raining. Heat and moisture can cause the stain to dry unevenly. Likewise, if it's too cold, such as in winter or early spring, the stain may not be able to dry fully. Before you start, check the forecast to ensure there will be no rain and low humidity for at least a few days.

A cedar fence will actually last quite a long time even if you don’t treat it with stain. In fact, you can expect to get between 15 and 30 years out of an untreated cedar fence. However, if you want to preserve its color and extend its life, treat it with a combination stain and sealer every three to five years.