The short version

  • Cold does not hurt patio cushions. Trapped moisture does, so drying matters more than any container you buy.
  • Clean off pollen, sunscreen, and dust first. Mildew feeds on that film, not on the fabric itself.
  • Give cushions two or three dry days upright on edge before they go anywhere. Foam holds water long after the surface feels dry.
  • Store them off the concrete floor, in something breathable or vented. A sealed bin plus a slightly damp cushion equals mildew by February.
  • If your garage or shed has ever had mice, use hard-sided lidded bins. Cushion foam is ideal nesting material.

What this covers

Clean the cushions, dry them completely, and put them somewhere dry, breathable, and off the floor. That is the whole job. Freezing temperatures do almost nothing to outdoor fabric or foam, while a single damp cushion sealed in a bin in October will come out spotted and sour in spring.

Most of the advice you find online sells you a storage bag. The bag is the least important part. What you do in the three days before the bag decides whether the cushions survive.

How do you store patio cushions for the winter?

Work in this order: brush, clean, dry, then contain. Skipping straight to containing is the mistake that ruins cushions.

Start by brushing off the loose stuff with a dry stiff brush or a shop vacuum. Pollen, leaf grit, and cobwebs come off much easier dry than wet.

Then wipe the fabric down with warm water and a small amount of dish soap or a mild laundry detergent. Sunscreen and body oils leave a film that mildew feeds on all winter, and that film is invisible on most patterned fabric. Rinse with a hose on a gentle setting so you are not driving soap deeper into the foam.

Now stand the cushions on edge, not flat, somewhere with moving air. On edge lets water drain out of the foam instead of pooling in the bottom inch. Two or three dry days is realistic in September, and a fan pointed at them cuts that time noticeably.

Only then do you put them away. Breathable zippered storage bags, an old cotton sheet, or a vented bin all work. What you are avoiding is a sealed airtight container holding humid air against fabric for five months.

How dry do cushions need to be before storage?

Dry all the way to the core, which is a different standard than dry to the touch. Outdoor cushion foam is usually a reticulated or quick-dry type, but it still holds water in the middle long after the cover feels fine.

Press hard on the middle of the cushion with a folded paper towel. If the towel picks up any dampness, give it another day. Press near the seams too, since piping and welting hold water longest.

Pick a stretch of dry, breezy days for this rather than a humid week after rain. Sun helps, though long exposure fades colors, so a shaded spot with airflow beats a hot patio if you have the time.

If your cushions got soaked repeatedly this summer and already smell musty, that odor is bacteria and mold in the foam. Cleaning the cover will not fix it. Read our walk-through on getting a stubborn musty smell out of fabric for the enzyme approach, and be willing to replace the foam inserts if the smell survives a real cleaning.

Where should you store outdoor cushions without a garage?

Rank your options by how dry the space stays, not by how convenient it is. A dry closet beats a damp basement every time, even though the basement has more room.

Good spots include an interior closet, under a bed, a spare-room corner, a dry attic, or the top shelf of a laundry area. Cushions compress more than you think, and four seat cushions squeeze into surprisingly little space when stacked on edge.

Basements need a check first. If yours runs above roughly 60 percent relative humidity, cushions will pick up that moisture and hold it, so you want a dehumidifier running or a different room. Our explainer on whether a dehumidifier actually helps with basement mold covers what those numbers mean in practice.

Wherever they land, get the cushions off a concrete floor. Concrete wicks moisture up from the ground all winter, and a cushion sitting flat on it will be damp on the bottom by January. A pallet, a shelf, two lengths of scrap lumber, or a plastic bin lid all solve it.

Apartment renters, a hall closet with the door cracked open a few inches works fine. Airflow matters more than square footage. That same logic applies to indoor condensation on cold windows, where stagnant humid air against a cold surface is the whole problem.

Is a deck box good enough for winter?

A deck box is fine for summer storage and mediocre for winter. It keeps rain off, but it sits outside, so its interior tracks outdoor temperature and swings through condensation cycles every time the sun hits the lid.

If a deck box is your only option, three things make it workable. Set it up on feet or blocks so the bottom is not sitting in snowmelt, check that the drain holes are clear, and add a couple of desiccant tubs inside.

Leave the cushions in breathable bags inside the box rather than bare. That gives you a second layer between the fabric and any water that finds its way in through the lid seam.

Open it once in midwinter on a dry day and feel the cushions. If they are cool but dry, you are fine. If they feel clammy, move them indoors before spring, because mildew growth is well underway by then.

Can you leave patio cushions outside all winter?

You can, and they will wear out faster. Solution-dyed acrylic and olefin fabrics tolerate weather well, but the foam inside is the weak point, and repeated soak-and-freeze cycles break it down and hold water.

Covering the furniture with a tarp while cushions stay in place is worse than leaving them uncovered. A tarp traps humid air, blocks drying, and creates exactly the closed damp environment mildew wants.

If you truly cannot store them inside, at minimum stand them on edge under a roofed porch, off the ground, with air on both sides. That gets you most of the benefit for none of the storage space.

The honest math: a set of replacement cushions costs far more than the effort of hauling them into a closet for five months. This is a case where the free fix beats every product.

How do you keep mildew and mice out of stored cushions?

Mildew is a moisture problem and mice are a container problem. They need different answers.

For mildew, dryness does the work. Clean fabric plus dry foam plus airflow means there is nothing to grow. Desiccant packs or a moisture absorber tub in the storage area help in a damp basement or shed, but they are backup, not a substitute for drying properly.

For mice, use hard-sided bins with tight lids in any garage or shed that has ever had rodents. Cushion foam is close to perfect nesting material, warm and shreddable, and a fabric storage bag is no barrier at all. Cardboard boxes are worse, since mice chew them and the boxes absorb floor moisture.

Skip the dryer-sheet and peppermint-oil folklore. Mice walk past both. Sealing entry points and using a chew-resistant container is what actually keeps them out.

If a pet sleeps on the patio furniture during the season, brush the cushions hard before storage. Embedded hair holds dander and odor for months, which is the same reason late-summer shedding shows up on every soft surface in the house.

Should you wash the covers before you put them away?

Wash them if the zippers say you can, and check the care tag first. Many outdoor cushion covers unzip and take a cold machine wash on gentle, though some have a water-repellent finish that repeated washing strips away.

Never put outdoor covers in the dryer. Heat shrinks them, and a shrunk cover will not go back over its foam insert. Air dry them flat or on a line instead.

Put covers back on while they are very slightly damp. They stretch more easily then, and the last five percent of drying happens on the foam. Then let the whole cushion finish drying on edge before storage.

Bulky covers that fight your machine follow the same rules as any oversized bedding item. The approach in our guide to washing a weighted blanket in a standard machine applies here, especially the part about not overloading the drum.

Once the cushions are put away, the patio cleanup usually continues indoors with vacuuming and closet reshuffling. If that is your September, our current deals lean toward home organization this time of year.

Frequently asked questions

Can I vacuum-seal patio cushions to save space?

You can, but expect creasing. Compressing foam for months can leave permanent folds and dents that never fully recover, especially in thicker seat cushions. Vacuum bags also seal in whatever moisture is present, so only consider them for thin back cushions you are certain are bone dry.

Is it bad to store cushions flat and stacked?

Stacking flat is fine indoors in a dry room. On edge is better in a garage, shed, or basement because air can reach both faces of every cushion. Either way, keep the bottom cushion off a concrete floor.

Do outdoor cushions need to be stored above freezing?

No. Acrylic and olefin outdoor fabrics and their foam inserts handle freezing temperatures without damage. An unheated but dry attic or shed is a better home for them than a warm, humid basement.

What if I already see mildew spots on the fabric?

Treat before storing, not in spring. Scrub with a mix of mild soap and water, then follow with a diluted bleach solution on solution-dyed acrylic only, or an oxygen bleach product on fabrics that cannot take chlorine. Rinse thoroughly and dry completely, because leftover moisture restarts the growth.

The part worth remembering

Give yourself one dry weekend for this rather than doing it in a rush on the first cold night. Clean, dry to the core, breathable container, off the floor. Everything else is optional.

If you only change one habit this year, make it the drying step. Nearly every ruined cushion in a spring storage bin was put away slightly damp in October by someone who was in a hurry.