The best time to mow a newly planted lawn is after the roots of the grass are established. Lawns that have been seeded typically require up to two months before they can be mowed. Seeded lawns can't be mowed until all of the seeds have germinated.
Sod can be mowed within two to three weeks after being planted. Grasses such as sprigs, stolons and plugs take three to six weeks to become established before they can be mowed. The roots of sod, sprigs, stolons and plugs must be firmly planted in the lawn soil before mowing to prevent the new turf from being torn out.