How often to mow a lawn in Charleston changes a lot through the year. In July a St. Augustine yard in West Ashley can need cutting every week without fail. In January the same yard is dormant and tan and barely needs attention. The right schedule is not a fixed number of days. It follows how fast your grass is growing, and that depends on the season, the weather, the type of grass and how much it is fed and watered. Here is how to think about mowing frequency in the Lowcountry, season by season.
The rule that sets the schedule
Clemson Cooperative Extension gives one rule that answers the frequency question. Never remove more than one third of the leaf height in one mowing.
So the schedule comes from your target height. If you keep centipede at 2 inches, mow before it reaches 3 inches. If you keep St. Augustine at 3.5 inches, mow before it gets past about 5 inches. When the grass is growing fast, that point comes quickly. When growth slows, you can stretch the time between cuts.
Cutting off more than a third at once shocks the grass. Roots stop growing for a while, the lawn looks brown and stemmy, and it needs more water to recover. If you are not sure of your target height, start with our guide to mowing height for warm season grass.
How often to mow a lawn in Charleston through the year
Charleston's warm season grasses grow hardest in the heat. Here is a typical pattern for the coast.
| Time of year | What the grass is doing | Typical frequency |
|---|---|---|
| January to March | Dormant, tan | Rarely, cleanup only |
| Late March to April | Greening up | One cleanup mow, then every 7 to 14 days |
| May to August | Peak growth | Every 5 to 7 days |
| September to October | Slowing down | About every 7 to 10 days |
| November to December | Going dormant | As needed for leaves |
These are general ranges. A heavily fed bermuda lawn in full sun on Daniel Island will outgrow a lightly fed centipede lawn in a shady Summerville yard every time.
Spring green up
Coastal lawns usually green up in April, a little earlier than inland. Clemson recommends a cleanup mow just before green up with a bagger, at a slightly lower height, to remove dead winter leaf material. Do not scalp. Once the lawn is actively growing, move back to the normal height and start mowing regularly. Growth in April can be uneven, so mow when the grass needs it rather than on a set day.
Summer
From May through August, heat, humidity and afternoon storms make warm season grass grow fast. Weekly mowing is the standard for most Lowcountry lawns in summer, and bermuda or heavily watered St. Augustine can need more. Skipping a week in July often means cutting off more than a third on the next pass. That is how many lawns get scalped.
Summer storms make timing tricky. Try not to mow soaked turf, since wet clippings clump and mower wheels leave ruts in soft ground. Mowing a day after a heavy rain is usually better than mowing in standing water.
Fall
Growth slows as nights cool in September and October. Many lawns can go 7 to 10 days between cuts by mid fall. Clemson suggests raising the mowing height slightly once nights fall below about 70 degrees, which helps the grass store energy before winter. Keep mowing as long as the grass is growing. Falling leaves also need to come off the lawn, because a thick layer shades the grass and holds moisture that favors disease.
Winter
Dormant warm season grass does not need regular mowing. An occasional pass can mulch leaves or tidy up winter weeds that stick up above the tan turf, but there is no benefit to cutting dormant grass short. If a lawn was overseeded with ryegrass for winter color, it will need regular mowing through the cool months. That is a separate topic we cover in overseeding a lawn in Charleston.
Grass type changes the pace
St. Augustine
St. Augustine grows fast in summer and needs medium to high mowing frequency, according to Clemson. Weekly is typical. Because it is kept tall, missing a week can leave a very long lawn that is hard to cut back without scalping.
Centipede
Centipede grows more slowly and needs less mowing than St. Augustine or bermuda, especially when it is fed lightly, as it should be. Many centipede lawns can go a bit longer between cuts in summer. Just stay inside the one third rule.
Zoysia
Zoysia grows slowly compared to bermuda, but it is kept short, so small amounts of growth still add up to a third of the blade quickly. Weekly mowing in summer keeps it tight and limits thatch.
Bermuda
Bermuda is the fastest grower of the four. At 1 to 1.5 inches, it can hit the one third limit in just a few days in midsummer. Bermuda lawns in full sun often look best mowed more than once a week in peak season.
What speeds up or slows down growth
Several things change how often you need to mow.
- Fertilizer. More nitrogen means more growth and more mowing. Feeding at the wrong time or rate creates extra work and can harm the lawn. See the best time to fertilize a lawn in Charleston SC.
- Water. Frequent irrigation pushes growth. Clemson recommends watering deeply and only when the lawn shows stress.
- Sun and shade. Grass in full sun grows faster than grass under live oaks.
- Rain. A wet summer week can double growth compared to a dry one.
Keeping a steady schedule
The easiest way to stay inside the one third rule is a regular schedule. A weekly visit through the growing season keeps growth predictable and makes each cut light. That is how Right Stuff Lawn Care runs mowing and maintenance, with the schedule easing off as growth slows in fall. A lawn cut lightly and often is thicker, greener and better at crowding out weeds than one cut hard every other week.
Frequently asked questions
Is it OK to mow every two weeks in summer in Charleston?
For most lawns it is too long. Warm season grass grows fast from May through August, and two weeks of growth usually means cutting off more than a third of the leaf. That stresses the grass and can scalp it.
When should I start mowing in the spring?
Start with a cleanup mow just before or as the lawn greens up, which is usually April on the coast. Once the grass is actively growing, mow whenever it grows about a third above your target height.
When can I stop mowing for the year?
Keep mowing as long as the grass is growing, which often runs into late October or November in the Lowcountry. Once the lawn goes dormant and tan, regular mowing can stop. Keep removing fallen leaves through winter.
Should I mow a dormant lawn in winter?
Only if needed. An occasional pass to pick up leaves or knock down winter weeds is fine. There is no reason to cut dormant warm season grass short.