Deck staining in Colorado lasts 2–4 years on horizontal surfaces when prep and product are both right. Most jobs that fail early cut corners on one or the other — usually both.
Why Colorado is hard on deck stain
At Front Range elevations, UV intensity is higher than at sea level. Horizontal deck surfaces sit flat in direct sun all day, collect standing water in summer storms, and take foot traffic on top of that. Add hard winters with freeze-thaw cycling that starts in October and the conditions are genuinely demanding. Film-forming coatings — sold as 'deck stain' at big-box stores — fail on horizontal surfaces within 12–18 months here. They trap moisture, blister, and peel. Penetrating oil-based stain absorbs into the wood grain, has no surface film to fail, and holds up to 2–4 years when applied over properly prepped wood.
Prep is 80% of the result
Stain bonds to the first thing it contacts. If that's grime, mildew, or UV-oxidized grey wood fibre, the bond is with the contamination — not the wood. We wash with a mildewcide solution, rinse, apply a wood brightener to neutralise pH and open the grain, then let the wood dry completely before any product goes on. On decks neglected for several seasons, we use a concentrated wood cleaner before washing to break down embedded grey oxidation.
We check moisture content with a pin-type meter before staining. Decks that were recently washed — or caught in rain — need additional dry time. Staining above 15% moisture content traps water beneath the finish and the stain never fully bonds. We schedule wash and stain on separate days with 24–48 hours between, longer if conditions call for it.
Before you book
If your deck has thick, peeling solid stain or old paint from a previous job, we can't stain over it. That surface needs stripping first — a different job at a different price. We'll identify it during the estimate and tell you what's actually needed rather than quote a stain job that's going to fail inside a season.