How Often Should You Stain a Deck? Timing, Tests and Cost

Why decks need it more often than fences

A deck floor lies flat. Rain sits on it instead of running off, the sun hits it all day, and people walk on it. That wears a finish out far faster than on a fence or a wall.

Researchers at the US Forest Service tested 32 deck finishes outdoors for over three years. Water repellency had mostly gone by 21 months, every finish was in poor condition by 39 months, and they called a 2 to 3 year life excellent for that kind of finish on a deck.

How long each type of stain lasts

Clear sealers and toners have little or no pigment, so the sun gets through. Expect to redo them every year or two.

Semi-transparent stains have enough pigment to protect the wood and still show the grain. The US General Services Administration puts a single coat at 2 to 4 years on smooth wood, and a two-coat system at up to 8 years depending on exposure. On a deck floor, the low end is more realistic.

Solid stains cover the grain like a thin paint and last longer on the surface, but like paint they can peel, and peeling stain has to be stripped or sanded before the next coat.

Coastal decks, high-altitude decks and decks that face south wear out faster, according to the same GSA guidance. Shade helps, but a shaded deck that stays damp has problems of its own.

The water test

Sprinkle a little water on the boards in a few places, including the busiest spots and the sunniest ones.

If it beads up, the finish is still working.
If it soaks in and darkens the wood within a few minutes, it's time to restain.

Fading color is the other sign. When the stain has worn to bare gray wood in the traffic paths, the boards are unprotected there.

Top view of a deck half weathered gray and half freshly stained brown — The same deck before and after staining. Floors fade first in the paths people walk and where the sun hits hardest.

Staining a new deck

New pressure-treated boards are usually too wet to take stain. Use the same water test: while water beads on brand-new wood, wait. Depending on the weather, that can take from a few weeks to a few months. Cedar and other untreated woods are often ready sooner.

What it costs each time

At our October 2026 prices, for the deck floor only:

Deck size	Sq ft	Gallons	Stain only	Washed and stained by a pro
10 × 10 ft	100	1	$35	$185–$255
12 × 12 ft	144	1	$35	$255–$345
12 × 16 ft	192	1	$35	$330–$450
16 × 20 ft	320	2	$70	$565–$760
20 × 20 ft	400	2	$70	$690–$930

Add the railing and the area jumps, because every baluster has four sides. The deck staining calculator includes the railing and lets you choose one coat or two.

Those costs come back every few years, and they're the main reason people choose composite. The composite vs wood calculator adds them up over 10 to 25 years.

Doing it right

Wait for a stretch of dry weather, with no rain forecast for a day or two after you finish.
Sweep, then clean the deck with a deck cleaner, and let it dry completely.
Replace any boards that are soft, and sink any nails or screws that have worked up.
Work a few boards at a time along their full length, so you don't leave lap marks.
Wipe up puddles. Stain that sits on the surface instead of soaking in is what peels later.

Always follow the directions on the can for drying times and temperatures. They vary between products.

Fair questions

Can I put a new stain over the old one?

Usually, if it's the same type and the old coat is worn rather than peeling. Going from solid back to semi-transparent, or from oil to water-based, often means stripping first.

Is two coats better than one?

For semi-transparent stain, two thin coats generally last longer than one, as long as the wood can absorb the second. More stain than the wood takes just sits on top.