How often to mow your lawn in Denver and Aurora depends on the season, not a fixed schedule. Colorado's Front Range growing season has two distinct phases, and mowing frequency should change with them.
The Colorado Mowing Calendar
Kentucky bluegrass and tall fescue, which make up almost every residential lawn in Aurora and Denver, follow a cool-season growth pattern. They grow fast in spring and fall, slow down in summer heat, and go dormant in winter.
- April through June: Weekly mowing. Grass is growing fast coming out of dormancy. Letting it go two weeks means cutting off too much at once, which browns the tips and stresses the plant.
- July through August: Every 10 to 14 days. Growth slows in the heat. Weekly mowing in mid-summer often means cutting the same grass twice before it's ready. Bi-weekly is fine if you're irrigating normally.
- September through October: Weekly again. Cooler temps bring a second growth flush. This is when bluegrass recovers from summer stress and puts on its best growth of the year. Don't let it get away from you.
- November through March: No mowing. The lawn is dormant.
The One-Third Rule
Never cut more than one-third of the grass blade in a single mow. This is the most important mowing principle for a healthy lawn.
If your lawn is supposed to stay at 3 inches, mow when it reaches 4.5 inches. If it gets to 6 inches before you cut it, you would need to remove half the blade in one pass, which shocks the grass, browns the tips, and leaves clippings too heavy to break down naturally.
The one-third rule is why frequency matters. A weekly schedule in spring is much easier on the lawn than a bi-weekly schedule that requires aggressive cuts.
Mowing Height by Season
Mowing height matters as much as frequency:
- Spring (April to May): 2.5 to 3 inches. Slightly lower helps sunlight reach the soil and encourages lateral spread.
- Summer (June to August): 3 to 3.5 inches. Taller grass shades the soil, retains moisture, and handles heat stress better.
- Fall (September to October): 2.5 to 3 inches. Shorter heading into winter prevents snow mold.
- Last mow of the season: 2 to 2.5 inches. Prevents matting under snow.
What Happens If You Mow Too Infrequently
Skipping mows in spring causes several problems. You end up cutting too much at once, which browns the tips and stresses the grass. Heavy clippings left on the surface can clump and block sunlight, creating dead patches. And the lawn just looks neglected, which affects your curb appeal and, potentially, your neighbor relationships.
For most Aurora homeowners, the right default is weekly service from late April through October with a potential switch to bi-weekly in July and August if growth genuinely slows down. A professional lawn mowing company will adjust the schedule to what your lawn actually needs rather than just showing up on a fixed interval regardless of conditions.