Zucchini is a fruit that is best kept in the refrigerator for optimal freshness and longevity. According to the USDA, zucchini can last up to two weeks when stored in the fridge, provided it has been properly washed, trimmed and sealed.  On the other hand, when stored on the counter, it will only last a few days before decaying. To ensure your zucchini remains fresh for as long as possible, keeping it in an air-tight container or bag in a cool environment such as the refrigerator is key.  Furthermore, storing zucchini in the fridge can help reduce ethylene gas exposure which helps promote a crisper texture and longer shelf life.