It depends on what you planted and how you planted it. For seeded lawns, it may take up to 2 months before you can start mowing. Sod may take only 2 to 3 weeks, while sprigs, stolons, and plugs can require up to 6 weeks. Wait until the root system is firmly established so you don’t risk pulling out any of your new turf when mowing. Also, it's recommended to let your lawn grow a bit longer than usual for the first couple of mows before you cut to the recommended height. This way, you give the new turf a chance to become established and reduce the risk of scalping damage. Learn more about mowing in our lawn care tips for Tennessee.