The short answer is: it's not recommended. While some modern "all-weather" wicker made from synthetic resins like polyethylene can withstand winter conditions better, traditional natural wicker (made from rattan, bamboo, or willow) is highly vulnerable to cold, wet weather. Leaving it outside unprotected can lead to severe damage.
Winter elements cause multiple problems. Moisture from rain, snow, and ice can be absorbed, leading to swelling, mold, mildew, and eventual rotting of the fibers. Repeated freezing and thawing cycles make the material brittle, causing it to crack, split, and lose its structural integrity. The finish can also fade and peel under harsh conditions.
To protect your investment, the best practice is to store wicker furniture indoors for winter—in a garage, shed, or basement. If indoor storage isn't possible, use a high-quality, breathable, waterproof cover that is securely fastened to prevent moisture buildup and wind damage. Elevate the furniture off wet ground using pads or bricks.
For those seeking low-maintenance options, consider investing in high-quality all-weather wicker designed specifically to resist moisture, UV rays, and temperature extremes. Even with this durable material, a cover during severe weather is advisable. With proper care and protection, you can enjoy your wicker furniture for many seasons to come.