how long is a whole watermelon good for in the fridge
Best Answer: A whole watermelon will last 10-14 days if kept in the refrigerator. A cut watermelon will last 4-5 days in the fridge before beginning to go bad. I doubt that the watermelons that are no longer on the vine will last until Halloween.est Answer: A whole watermelon will last 10-14 days if kept in the refrigerator. A cut watermelon will last 4-5 days in the fridge before beginning to go bad. I doubt that the watermelons that are no longer on the vine will last until Halloween.