Each turf species has an optimal cutting height. Learn the best mowing heights by season and grass type to keep your lawn healthy, prevent stress, and promote thicker, greener growth. · the ideal length of your lawn depends on your climate, but most experts agree you should keep your grass between 2 1/2 inches to three inches long, with the last cut of the season remaining the same. · begin by getting to know your grass ; Then, consider seasonal factors like heat and drought when adjusting the mower blades. Here’s everything you need to know to figure out the best height to cut grass. · for best results, lawn care experts recommend letting the grass grow to a little more than 5 inches, then cutting it back to around 3. 5 inches , removing about 1/3 rd of the blade. · use the grass cutting height chart below as a guide for when to cut your grass type and how low to trim it. We’ll break down the cutting heights for each grass type for a thriving lawn. · below, review our grass-cutting height chart for types of grasses and learn how high to cut grass in the spring, summer, and fall. Warm-season grasses should typically be cut to about 2 to 2 ½ inches high. Cool-season grasses should typically be cut to about 3 to 4 inches high. · discover the best mowing height for your grass with our easy-to-read chart.