Mow high and follow the one-third rule
For many cool-season lawns, a mowing height around 3 to 3.5 inches is a useful starting point. Avoid removing more than one-third of the grass blade in a single cut; mowing too short puts unnecessary stress on the turf.
Crew TipAdjust the schedule to growth rather than the calendar. Fast spring growth may need more frequent mowing than a dry stretch in midsummer.
