How long do outdoor extension cords last, and when should I replace them?

Outdoor extension cords typically last 2–5 years when left outside seasonally. UV light is the main killer, even for “weather-resistant” jackets. Inspect any cord after three full seasons for cracking, stiffness, or corrosion on the prongs. Replace it if anything looks off — a bad extension cord is a fire hazard, and for critical stuff like Christmas lights or a shop vac, don’t push it past four years.