Photo: istockphoto.com We may earn revenue from the products available on this page and participate in affiliate programs. Learn More › Home Advice You Can Trust Tips, tricks & ideas for a better home and yard, delivered to your inbox daily. The ideal grass height depends on whether you have cool- or warm-season grasses. You’ll generally want to mow your cool-season grass to a height of between 2½ and 3½ inches , says Gene Caballero, co-founder of GreenPal . “This height helps promote a deeper root system, which helps with drought resistance and reduces weed growth,” he says. Warm-season grasses can be cut to a lower height of 1½ to 2 inches . How you cut your lawn also depends on other factors. “Grass type, season, and local climate impact the ideal cutting height,” Caballero says.  Aim for the height that’s best for your grass species. When determining when it’s time to cut your lawn and how much to trim, the decision depends on the grass species.…