Labor Day is coming up fast, which means a lot of you are about to fold up the patio furniture, stack the cushions in the garage or a plastic bin, and forget about them until Memorial Day. Then next spring you’ll unzip that bin and get hit with a smell that can only be described as swamp-adjacent. This happens to almost everyone, and it’s completely avoidable if you spend twenty extra minutes now.
The mildew is already in there
Outdoor cushions look dry on the surface way before the foam inside actually is. Even if it hasn’t rained in a week, morning dew and humidity get wicked into the foam every single night all summer long. By the time you’re packing them away in late August, that foam has been damp, on and off, for months. Sealing that moisture inside an airtight bin is basically running a mold incubator until spring.
Actually dry them before storage
Don’t just wipe the covers down. Pull the covers off if they’re removable and wash them separately, then stand the foam inserts on their edge somewhere with good airflow for at least two full sunny days. Flip them once. If you press on the foam and any water squeezes out, it needs more time. This is the step almost everyone skips, and it’s the one that actually matters.
A cheap moisture meter, like the ones people use for firewood or drywall, works fine on cushion foam too and takes the guesswork out of “is this actually dry.” A basic moisture meter is cheap enough that it’s worth having in the garage anyway for checking lumber, drywall, or that suspicious spot under the kitchen sink.
Skip the airtight plastic bin
This is the part that trips people up. Sealed plastic totes feel like the responsible choice, but they trap whatever residual humidity is left in the fabric with nowhere to go. Fabric storage is actually better here. A breathable storage bag or even a large canvas duffel lets trapped moisture escape slowly instead of stewing. If you’re going to use bins, drop in a few silica gel packs or a moisture-absorbing container designed for closets, and don’t pack the cushions in tight — leave room for air to move.
Where you store them matters more than what you store them in
A damp garage corner or an uninsulated shed is a bad location no matter how well you dried everything first, because it just re-absorbs moisture from the surrounding air. If your storage options are limited, elevate the bin off the concrete floor on a shelf or pallet. Concrete slabs sweat, especially as temperatures swing in fall, and a bin sitting directly on it will pull moisture up from underneath.
Fabric protector isn’t just for keeping color from fading
A lot of people use fabric protectant spray purely to stop sun fading, but it also creates a water-repellent barrier that makes cushions dry faster and resist mildew growth during the season, not just in storage. Spraying your cushions down once at the start of summer and again before you pack them away is a cheap habit that pays off. Outdoor fabric protector spray runs about the price of a fast food meal and lasts most of the season.
Already smells musty? Don’t just spray it and pack it away
If you’re reading this because last year’s cushions already have that smell, know that fabric spray and febreeze will not fix it — mildew odor means active mold growth, not just trapped smell. A mix of white vinegar and water scrubbed into the fabric, followed by full sun drying, kills most surface mold. For foam that’s actually gone moldy inside, it’s usually cheaper and less gross to just replace the inserts than to try to save them. The EPA’s mold cleanup guidance is a decent reference if you’re dealing with anything beyond surface staining.
None of this is complicated, it just requires patience you don’t feel like having in the last warm week of August. But drying things properly now is a lot less annoying than replacing an entire cushion set in June because it came out of storage smelling like a wet basement.
