To store yellow zucchini, follow these simple steps: Refrigerate for longer storage: If you need to store yellow zucchini for longer than 2-3 days, place them in a plastic bag or airtight container and store them in the refrigerator. They can last up to 5-7 days in the fridge. Do not wash before storing: Do not wash yellow zucchini before storing them, as this can cause them to spoil more quickly. Instead, wait until you are ready to use them before washing them. Store separately: If you are storing other vegetables or fruits with yellow zucchini, make sure to store them separately. Yellow zucchini can release ethylene gas, which can cause other fruits and vegetables to ripen and spoil more quickly.