How to Keep Lemons Fresh for Months When stored in a plastic bag, lemons usually stay fresh for only a few days. But if you place them in a clean glass jar, cover them completely with water, and seal the lid tightly, they can last up to 3 months in the refrigerator. The water keeps the peel hydrated, preventing it from drying out. The lemons retain their natural aroma, flavor, and juiciness for much longer. A simple, practical way to reduce waste and always have fresh lemons ready for your recipes.