How to Stain a Deck

Updated August 2026 · Home Project Resources

Preparation decides the result. Stain applied to a deck that's dirty, still damp, or too new to accept it will peel, blotch, or wear off in a single season, and no amount of product quality makes up for it. Plan on spending two thirds of your total time on cleaning, brightening, and drying, and one third on the stain itself.

The sequence that works: clean, brighten, dry fully, confirm with the water-bead test, then stain in the right weather. Skip any one of those and you're recoating next year instead of in three or four.

Need the square footage before you buy stain? Our deck calculator sizes decking and framing, and the square footage calculator handles odd shapes and stair treads in a few seconds.

Updated August 2026

A note on numbers. This page gives you coverage rates, drying windows, gallon math and the prep sequence, not dollar figures. Stain, cleaner and deck labor are priced by your region, your retailer and the product line you pick, and none of that is ours to set. Work out your gallons here, then price them locally and get any hired work quoted itemized.

How to stain a deck: the full sequence

1. Clear the deck completely, including furniture, grills, planters, and rugs.
2. Sweep and clean between the boards with a putty knife or a saw blade.
3. Set and repair. Countersink popped nails or screws, replace split boards, sand splinters.
4. Wash with a deck cleaner, not just water.
5. Apply a brightener after cleaning, then rinse.
6. Let it dry 48 hours minimum, longer after a pressure wash or a wet week.
7. Run the water-bead test to confirm the wood will take stain.
8. Check the forecast for temperature, humidity, and rain.
9. Protect siding, plants, and hardware.
10. Stain in full boards, end to end, back-brushing as you go.
11. Second coat only if the product calls for it, wet on wet or within the stated window.
12. Keep off it for the stated cure time, typically 24 to 48 hours for foot traffic and 72 hours before furniture goes back.

Budget a full weekend for a typical deck: one day for prep and drying, one day for stain.

New pressure-treated lumber has to weather first

Fresh pressure-treated lumber is saturated with the water-based preservative solution it was pressure-injected with at the mill. Wet wood cannot absorb stain. Put stain on it anyway and it sits on the surface, dries into a film, and peels off in sheets when the wood finally dries and moves.

How long to wait: commonly quoted as anywhere from 30 days to a full year, and both extremes are wrong as a rule. The real answer depends on how wet the lumber was when you got it, how much sun and wind the deck gets, and your climate. A summer deck in Arizona can be ready in three to four weeks. The same deck in coastal Oregon might take four months. Kiln-dried-after-treatment lumber, sold as KDAT, is often ready in a couple of weeks.

Don't wait indefinitely either. Leaving new lumber bare for a full year lets UV break down the surface fibers and gray them, and it invites mildew and cupping. Six weeks to a few months is the usual sweet spot, and the test below is what actually tells you.

The water-bead test

Sprinkle a tablespoon of water on the deck boards in three or four different spots, wait 10 minutes, and look.

• Water beads up and sits there: the wood is not ready. Either it's still full of moisture, or there's a mill glaze or an existing finish sealing the surface. Wait longer, or clean and sand.
• Water soaks in and darkens the wood within about 10 minutes: the wood is ready to take stain.
• Mixed results across the deck: stain will be blotchy. Clean the whole surface, then retest. Uneven absorption usually means uneven dirt or leftover finish, not uneven wood.

Test in several places, including a shaded area and a spot in full sun. Sun-exposed boards dry much faster and will pass while a shaded corner is still soaked.

Do the test again after cleaning and after the drying period, not just once. Cleaning changes the answer.

Cleaning and brightening: two different products

Most people do the first and skip the second, then wonder why the deck looks dull and gray under the new stain.

A deck cleaner removes dirt, mildew, algae, and gray weathered surface fibers. Most are alkaline, based on sodium percarbonate (an oxygen bleach) or sodium hydroxide. They work by breaking down organic buildup and lifting degraded wood fibers. Sodium percarbonate cleaners are the friendlier choice around plants and are enough for most decks.

A brightener is a separate product applied after the cleaner, almost always oxalic acid based. It does two jobs, and both matter.

• It neutralizes the alkaline cleaner. Alkaline residue left in the wood interferes with stain adhesion and can keep reacting with tannins.
• It restores color. Cleaning tends to leave wood looking washed out and dull, sometimes darkened by tannin reaction, and oxalic acid reverses that. It also dissolves iron stains, meaning the black streaks around nails and screws, and the rust marks from a planter or a grill leg.

The visual difference is dramatic and it's why brightening is not optional if you care how the finished deck looks. A cleaned-only deck stained with a semi-transparent product shows every dull patch through the finish.

The cleaning routine

1. Wet the plants and the surrounding ground thoroughly before you start, and cover shrubs with plastic sheeting. Rewet them after. This is the difference between healthy foundation plantings and dead ones.
2. Wear eye protection and chemical-resistant gloves. Both cleaners and brighteners are genuinely caustic or acidic. Long sleeves, and never work with either one overhead without face protection.
3. Wet the deck surface with plain water first so the cleaner doesn't soak in unevenly.
4. Apply the cleaner with a pump sprayer or a roller, working in manageable sections. Keep it wet on the wood for the dwell time on the label, usually 10 to 15 minutes. Do not let it dry on the surface.
5. Scrub with a stiff bristle brush on a pole. This is what actually does the work. A pressure washer alone without scrubbing leaves the film behind.
6. Rinse completely, working with the grain.
7. Apply the brightener the same way, dwell per the label (typically 10 to 20 minutes), rinse completely again.
8. Let it dry.

On pressure washers

A pressure washer speeds up rinsing, and it destroys decks in careless hands.

• Use 500 to 1,200 psi on softwoods like cedar, redwood, and pressure-treated pine. Above about 1,500 psi you are carving wood.
• Use a wide fan tip, 25 or 40 degrees, never a zero degree or turbo tip.
• Keep the tip 8 to 12 inches from the surface and moving constantly, with the grain, one board at a time.
• Never stop moving. A pause leaves a permanent stripe.
• Test on an inconspicuous board or a scrap first.

If a pressure washer raises fuzzy fibers, and it usually does, you now have to sand. That's not a failure exactly, but it's work you could have skipped by scrubbing.

Pre-1978 note: if any part of the deck, railings, or the adjacent house siding is painted and the structure predates 1978, assume lead paint until a test says otherwise. Do not pressure wash, sand, or scrape it. Lead check swabs are inexpensive and sold at any hardware store, and lab testing on a sample costs more but is definitive. Lead-safe work practices mean containment, wet methods, HEPA cleanup, and no dry sanding.

Sanding, and the grit that's too fine

Sanding is not always needed. Do it when:

• The deck has raised fuzzy fibers after pressure washing.
• There are splinters or rough spots you'd feel barefoot.
• Old solid stain or paint is failing in patches, so the surface is uneven.
• The wood has a mill glaze, a burnished surface from the planer knives, which is common on new lumber and shows as water beading in an isolated spot.

Use 60 to 80 grit on the deck floor and 80 to 100 on railings and handrails, which get touched. An orbital sander or a floor sander works, and hand blocks for the tight spots.

Do not go finer than about 100 grit. This is the part that surprises people. Fine sanding polishes and closes the wood pores, and stain needs open pores to penetrate. A deck sanded to 150 or 220 grit, which feels beautifully smooth, will reject stain and end up blotchy and shallow. Furniture wants fine grit. A deck does not.

Sweep and vacuum thoroughly after sanding, and blow the dust out of the gaps between boards. Then re-run the water-bead test, because sanding changes absorption.

Stain types compared

More pigment means longer life and more UV protection, and it also means a more visible failure when the finish eventually does fail. This is the honest tradeoff and it should drive the choice.

Two practical points that don't fit in the table:

Solid stain lasts longer on vertical surfaces than on the deck floor. Railings, risers, and skirting shed water and get far less abrasion. It's common and completely reasonable to run solid stain on the railings and semi-transparent on the walking surface.

Solid stain is a one-way door. Once a deck floor is coated with solid stain or paint, going back to a semi-transparent finish means stripping or sanding the whole surface. Think about that before committing.

Recoating rule: you can generally go darker or more opaque without stripping. You cannot go lighter or more transparent without removing what's there.

Oil versus water based

Both work. The right answer depends on your climate, the wood, and what you'll tolerate at recoat time.

Short version: oil based tends to win on dry, hot, sunny decks and on older wood that needs deep penetration. Water based tends to win in humid climates where mildew is the enemy, and on decks you want to recoat without stripping. Hybrid products exist that split the difference, and several of the best-testing deck stains on the market now are water-based alkyd hybrids.

Never apply one directly over the other without checking the label. Water based over old oil is the combination most likely to peel.

The weather window

More stain jobs fail for weather than for product choice.

• Temperature: 50F to 90F, air and surface, for the whole application and for several hours after. Check the low overnight too, since many stains need to stay above 50F for the first 12 to 24 hours to cure properly.
• No rain for 24 to 48 hours after, and check the product label because some need a full 72 hours. Overnight dew counts as rain on a fresh coat.
• 48 hours dry before you start. More after a pressure wash. A deck that looks dry on top can hold water an inch down, and moisture trapped under stain causes blistering and peeling.
• Humidity under about 70 percent if you can manage it, since high humidity dramatically slows both drying and curing.
• Never in direct hot sun. This is the one people ignore most. A deck board in direct August sun can hit 130F or more. Stain applied to hot wood flashes off before it penetrates, which leaves lap marks, uneven color, and a surface film rather than a penetrating finish. Follow the shade around the deck through the day, or start early morning and finish late afternoon.
• Not in strong wind. Wind drives dust, pollen, and leaves into a wet finish, and it speeds surface drying the same way hot sun does.

The best deck staining weather is an overcast day, 65F to 75F, low wind, with three clear days behind it and two ahead.

Applying the stain

Tools, honestly ranked:

• Stain pad on a pole: best all-round choice for the deck floor. Fast, controlled, applies an even film, and doesn't sling stain everywhere. Inexpensive, pole included.
• Brush: the best penetration and the best control, and the slowest. A 4 inch natural bristle brush for oil, synthetic for water based. Necessary for railings, balusters, and edges regardless of what you use on the floor.
• Roller: fast but tends to leave too much material sitting on the surface, and it puddles in the board gaps. Only useful if you back-brush immediately.
• Pump sprayer: fastest by far on big decks and railings, and it must be followed by back-brushing. A sprayer alone lays stain on the surface without working it into the wood, which produces a coat that peels.

Back-brushing means following the sprayer or roller with a brush or pad within a minute or two, working the stain into the grain and evening out the film. It is not optional with a sprayer. It's what turns "applied" into "penetrated."

Technique that avoids lap marks:

1. Stir the stain thoroughly, and stir again every 20 minutes. Pigment settles fast. Never shake, which introduces bubbles.
2. Box your cans. If you're using more than one gallon, pour them all into a 5 gallon bucket and mix. Batch-to-batch color variation is real and shows as a stripe across the deck.
3. Do a test area on an inconspicuous board or a scrap, let it dry fully, and look at it in daylight. Color on the can lid and color on your wood are different things.
4. Do the railings and vertical surfaces first, then the floor, so drips land on unstained wood.
5. Work full boards, end to end, without stopping. This is the single most important application rule. A stop in the middle of a board leaves a lap mark where the wet edge dried, and it's permanent. Stain two or three boards at a time across their full length.
6. Start at the end farthest from your exit and work backward, so you never paint yourself into a corner.
7. Don't over-apply. Penetrating stains take what the wood will absorb. Excess sitting on the surface stays sticky, attracts dirt, and peels. If there's still visible wet stain after 15 to 20 minutes, wipe it off with a rag.
8. Two coats only if the product says so, and only in the window it specifies, which is often wet-on-wet within an hour. Adding a second coat to a fully dried penetrating stain usually just builds a film.
9. Get the board ends and the cut ends. End grain absorbs several times more than face grain and it's where rot starts.

Cleanup and safety note: rags soaked in oil-based stain can spontaneously combust as the oil cures. Spread them flat outdoors to dry completely, or submerge them in water in a sealed metal can, before disposal. This is a real house fire cause every year, not a theoretical warning.

Coverage math and a worked example

Coverage on the can assumes smooth, sealed wood. Real decks absorb more.

Worked example: a 12 x 16 deck with railings and three steps.

Deck floor: 12 x 16 = 192 sq ft

Railings: the deck is open on three sides, so 12 + 16 + 12 = 40 linear feet of railing. A standard 36 inch railing with balusters, top rail, bottom rail, and posts works out to roughly 4 sq ft of stainable surface per linear foot once you count both faces of everything. 40 x 4 = 160 sq ft

Stairs: three steps, 4 feet wide. Treads plus risers plus stringers, call it 4 sq ft per step for the tread and riser plus a bit for the stringer sides. 3 x 5 = 15 sq ft

Skirting and exposed rim joist: 40 linear feet of rim board at roughly 1 ft tall. 40 sq ft

Board sides and gaps: the vertical faces of the deck boards inside the gaps absorb stain even though nobody counts them. Add about 10 percent to the floor number. 192 x 0.10 = 19 sq ft

Total stainable area: 192 + 160 + 15 + 40 + 19 = 426 sq ft

Gallons, one coat on weathered pressure-treated wood at 200 sq ft per gallon: 426 / 200 = 2.13 gallons

Buy 3 gallons. Here's why not 2: the railings will pull closer to 125 sq ft per gallon than 200, the end grain drinks, and you want leftover for touch-ups and for the boards you'll replace in two years. The third gallon is a rounding error against what the deck itself is worth, and running out mid-board on a Sunday afternoon is the expensive outcome.

Full material list for this deck:

The stain itself is most of the bill, so the tier you choose is the decision that moves the number. Everything else is a one-time tool purchase you will still own at the next recoat.

Professional deck staining is priced per square foot of stainable area including prep, and the spread between quotes is wide for real reasons: how much stripping the old finish needs, whether railings and balusters are in scope, stair count, whether the underside gets done, and how much board replacement the crew finds once the deck is clean. Get two or three quotes, hand each one the same stainable square footage from the math above, and insist that prep and application appear as separate lines. A quote that lumps them together is the one that gets renegotiated when the deck turns out to need stripping.

Use the deck calculator to get the deck's dimensions and board counts, and the square footage calculator for stair treads and any section that isn't a clean rectangle. If you're pricing a new build rather than refinishing an old one, deck cost has the material-by-material breakdown, and how to build a deck covers ledgers, footings, and code.

Maintenance intervals

Adjust down for a south-facing deck with no tree cover, a deck near saltwater, a deck with a hot tub, and anywhere with heavy freeze-thaw cycling. Adjust up for a shaded north-facing deck with light use.

The maintenance habit that doubles stain life: sweep the deck regularly, keep planters on feet rather than flat on the boards, move furniture a few inches twice a year so wear paths don't form, and recoat the high-traffic strip in front of the door a year before the rest of the deck needs it. Spot recoating a semi-transparent stain blends invisibly, which is one of its real advantages over solid.

Frequently asked questions

How long should new pressure-treated wood dry before staining?

Long enough to pass the water-bead test, which in practice is anywhere from a few weeks to a few months depending on climate, exposure, and how wet the lumber was at delivery. Sprinkle water on the boards in several places and watch for 10 minutes. If it soaks in and darkens the wood, it's ready. If it beads, wait longer and test again in two weeks.

Do I really need a brightener, or is cleaning enough?

You need it if you want the deck to look right. The brightener neutralizes the alkaline cleaner, which otherwise interferes with stain adhesion, and the oxalic acid restores the color that cleaning washes out. It also removes the black iron stains around fasteners. It's one of the cheapest products in the whole job, on a job where the stain alone costs several times as much.

Can I stain a deck without cleaning it first?

You can, and it will fail early. Stain has to reach wood, and a deck surface carries pollen, mildew spores, tannin bloom, and degraded gray fibers that stain simply sits on top of. Those fibers then shed and take your finish with them. Cleaning is the cheapest hour of the whole project.

What happens if it rains right after I stain?

Rain within the first several hours washes out or blotches uncured stain, and you'll usually see it as light streaks and dark pools. If it happens, let the deck dry completely for several days, assess in good light, and spot recoat the affected areas. Overnight dew does the same thing on a cool night, so check the low temperature and the dew point, not just the rain forecast.

Should I use a sprayer or a brush for deck stain?

A sprayer is far faster and must be followed by back-brushing within a minute or two, since spraying alone lays stain on the surface without working it in. For most homeowners a stain pad on a pole for the floor plus a brush for railings is the best combination of speed and result. Reserve the sprayer for large decks and complex balusters.

Why did my new deck stain peel after one season?

Almost always one of four things: the wood was still too wet to absorb the stain, the surface was never cleaned so the stain bonded to dirt rather than wood, too much stain was applied and formed a film, or the deck was sanded too fine and the pores were closed. All four are prep problems, not product problems.

Can I put water-based stain over an old oil-based finish?

Check the label, and be cautious. Water based over oil is the combination most likely to peel, because it can't penetrate a surface still holding oil and instead forms a film on top. If the old oil finish has weathered away almost entirely and the wood is passing the water-bead test after cleaning, it can work. If any old finish remains, either stay with oil or strip the deck first.

How much does it cost to stain a deck?

DIY, a typical 200 to 400 square foot deck is cleaner, brightener, about three gallons of stain, and applicators, and the stain is most of that bill. Hired out, deck staining is priced per square foot of stainable area with prep included, and it runs several times the DIY material bill because prep is where the hours go. To get a real number, measure the stainable area including railings and stair treads, hand that figure to two or three companies, and ask each to price prep and application on separate lines so the quotes compare.

The short version

Clean it, brighten it, dry it, test it, then stain it. Prep is where the result gets decided, and the water-bead test is what tells you the deck is actually ready rather than just looking ready.

Pick pigment level based on how much of the wood you want to see and how visible a failure you can live with. Stain in the shade at 50F to 90F with two clear days ahead. Work full boards end to end, back-brush anything you spray, and don't lay on more than the wood will drink.

Do that and a semi-transparent stain gives you three good years. Rush the prep and you'll be back out there next spring.