Whether you can leave your metal outdoor furniture outside all year depends heavily on the type of metal, your local climate, and the protective measures you take. Generally, it is not recommended to leave most metal furniture exposed to harsh winter elements without protection. Prolonged exposure to rain, snow, ice, and road salt can accelerate rust and corrosion, even on powder-coated or aluminum pieces. Moisture can become trapped in joints, leading to weakening and pitting.
For best results, storing furniture in a garage, shed, or covered area is ideal for winter. If storage isn't possible, use high-quality, breathable waterproof covers designed for outdoor furniture. Ensure the furniture is clean and completely dry before covering. For added protection, apply a protective wax or sealant designed for metal at the season's end.
Some metals fare better than others. Cast aluminum and wrought iron with excellent powder coatings are more durable, while steel requires more vigilant care. Regardless of material, elevating furniture off wet ground and away from drainage areas is crucial. With proper preparation and cover, you can minimize damage, but bringing it indoors remains the surest way to preserve its appearance and structural integrity for many seasons.