How often should I replace oven mitts?

Replace oven mitts when you see visible wear: thinning fabric, holes, melted spots, or when they no longer feel insulating. Most cotton mitts last 1 2 years with regular use. Silicone mitts last 3 5+ years. If you've had a mitt for several years and haven't checked its condition, it's worth testing hold it against something warm (not hot) and see if heat transfers quickly.