How to Keep Outdoor Cushions From Getting Moldy After Rain
Outdoor cushions get rained on. That is the job. But if they stay wet for more than a day, mold moves in. Black spots on the fabric, a musty smell that does not wash out, and eventually the cushion foam breaks down into a crumbly mess. I have thrown away three sets of patio cushions in ten years. The fourth set has lasted two summers so far because I finally figured out the system.
Step one: buy cushions that do not hold water
If you are shopping for new cushions, look for open-cell foam or quick-dry foam. These are designed to let water drain through instead of absorbing it like a sponge. Sunbrella fabric on the outside helps too — it is water-repellent and UV-resistant. Regular indoor cushion foam is basically a sponge wrapped in fabric. It will mold. Every time.
Step two: store them vertically after rain
Most people leave cushions flat on the furniture after it rains. Water pools in the fabric and seeps into the foam. Instead, stand them on edge so water can drain out the bottom. Lean them against the back of the chair or against a wall. If there is sun, face the wettest side toward it. Even fifteen minutes of direct sun makes a huge difference.
Step three: the waterproof cover that actually works
Those fitted plastic covers that come with patio furniture sets are terrible. They trap condensation underneath and the cushions get moldy inside the cover, which defeats the entire purpose. Better option: a breathable waterproof cover. Look for ones labeled “breathable” or “vented.” They keep rain out while letting moisture vapor escape. Or skip the cover entirely and bring the cushions inside when rain is forecast. I store mine in a deck box — a large plastic storage bench that doubles as extra seating.
How to rescue cushions that already have mold
- Brush off dry mold outdoors. Do not do this inside — you will spread spores everywhere.
- Mix a cleaning solution: one cup white vinegar, one cup warm water, a tablespoon of dish soap.
- Scrub with a soft brush. Let the solution sit for fifteen minutes.
- Rinse thoroughly with a hose. You want all the vinegar out — it can degrade fabric over time.
- Dry in direct sun for at least six hours. Flip once halfway through. The UV light kills remaining mold spores.
📋 Quick Summary: Buy quick-dry foam cushions, store them vertically after rain to drain, use breathable waterproof covers or a deck box, and clean existing mold with vinegar solution plus direct sun drying.