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Wood stains last anywhere from two to five years, depending on exposure to the elements, your local climate, the type of stain, and the surface it’s on. For instance, vertical surfaces last longer than horizontal surfaces. Some types of woods, like dense hardwoods, will require a recoat yearly, as they are too dense for the stain to absorb. In any event, apply a recoat every 2 to 4 years. As for storage, a can of unopened stain can last up to 5 years, though results may vary.

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.

While power washing isn't a requirement before you stain a fence, it can make the job much easier and faster while reducing manual labor requirements. The stain will not work if the wood is full of dirt and dust, so power washing, sometimes called pressure washing, is a fast and effective way to prepare the wood for staining. Remember that you need to stain or repaint relatively soon after the wood has dried so that there isn’t time for dust and dirt to build up again. 

Regular cleaning, rust-proof coatings, and checking fasteners help prolong the lifespan.