Honestly, the best winter storage method isn’t just throwing a tarp over the bench and hoping for the best. It comes down to cleaning off the grime, adding a protective layer, and keeping the bench dry and ventilated.
Start with a deep clean. Mix warm water with a little mild dish soap and scrub the frame, slats, and legs with a soft brush or sponge. Rinse everything well. For wood, let it dry completely for at least 24 to 48 hours. For metal, check for chips or rust spots. Sand those areas lightly and touch them up with outdoor enamel or rust converter. This is the single most important step for preventing rust.
After it dries, protect the material. For a wooden bench, apply teak oil, tung oil, or a quality exterior wood sealer. Focus on end grain and joints, because that is where water soaks in. For metal, a thin coat of paste wax or spray protectant works well. If your bench has removable cushions, do not leave them outside. Bring them indoors or store them in a sealed container.
Next, choose the best spot. A garage, shed, or dry basement is ideal. If you can, place the bench up on blocks or a pallet so air moves underneath and the legs do not sit in dampness. If a covered porch is your only option, push the bench against the house and away from rain splash.
If the bench has to stay outside, cover it with a breathable outdoor furniture cover. Avoid plastic tarps or tight wraps, because they trap condensation and can cause mildew, rot, and peeling paint. Look for a cover that fits the bench but leaves a small gap at the bottom for airflow. In snowy areas, brush off heavy snow after storms instead of letting it pile up. Do not chip at ice with a shovel; let it melt on its own.
That is really it. A couple of hours of prep in the fall saves you from cracked wood, ugly rust, and a replacement bill in spring.