Yes, potting soil does have an expiration date. The shelf life of potting soil is typically no more than 6 months, but this can vary depending on the ingredients used in the mix. Peat moss, a primary ingredient in potting soil, has a lifespan of roughly one to two years. It’s important to check your bag for specifics as it may have a best-by date. Unopened bags can last up to 2 years while opened bags should be used within 6 months.