Warm-season grasses like Bermuda and zoysia look best cut short, around 1–2 inches. Cool-season grasses like tall fescue want 2.5–4 inches. Cutting below your grass’s range is the most common reason a lawn thins out. Part of the complete mowing guide.
| Grass | Season | Typical mowing height |
|---|---|---|
| Bermuda | Warm | 1–2 in |
| Zoysia | Warm | 1–2 in |
| Centipede | Warm | 1–2 in |
| St. Augustine | Warm | 2.5–4 in |
| Tall fescue | Cool | 2.5–4 in |
| Kentucky bluegrass | Cool | 2.5–3.5 in |
| Fine fescue | Cool | 2.5–3.5 in |
| Perennial ryegrass | Cool | 1.5–2.5 in |
01 / Rules that apply to every grass
- Never cut more than a third of the blade at once. If the grass got away from you, lower the height over two or three mowings.
- Go higher in heat and shade. Taller blades shade the soil and hold moisture.
- Check the real height. The number on the deck lever often isn’t the actual cut. See how to measure and set your cutting height.
Not sure what grass you have?
A local mowing pro can identify it and get your grass cut at the right height every visit.
02 / By grass type
- Bermuda grass mowing height Short and often; scalps easily if skipped.
- Zoysia mowing height Dense and slow; a sharp blade matters most.
- St. Augustine mowing height Keep it tall to crowd out weeds.
- Centipede grass mowing height Low-maintenance, but hates being cut too low.
- Tall fescue mowing height The tallest cut of the common lawn grasses.
- Kentucky bluegrass mowing height Higher in summer to avoid heat stress.
- Fine fescue mowing height Shade lawns that need a higher cut.
- Perennial ryegrass mowing height Including overseeded winter lawns.
03 / Know your grass: season and growth habit
The right mowing height starts with knowing what you’re growing. Two traits matter most: whether the grass is warm-season or cool-season, and how it spreads. Grasses that spread by stolons (above-ground runners) or rhizomes (underground stems) creep sideways to fill in. Tall fescue is a bunch-type grass and grows in clumps instead.
| Grass | Season | Growth habit |
|---|---|---|
| Tall fescue | Cool | Bunch-type |
| Kentucky bluegrass | Cool | Spreads by rhizomes |
| Bermudagrass | Warm | Stolons and rhizomes |
| Zoysiagrass | Warm | Stolons and rhizomes |
| St. Augustinegrass | Warm | Stolons |
| Centipedegrass | Warm | Stolons |
Telling tall fescue from Kentucky bluegrass. These two often grow together in cool-season lawns. According to Penn State, tall fescue has rolled vernation (the new leaf is rolled in the shoot), short blunt auricles that may be absent, and a broad, divided collar. Kentucky bluegrass has folded vernation and no auricles. Both have a membranous, blunt ligule.
Sun and shade. Oklahoma State University Extension lists bermudagrass as needing full sun, while St. Augustinegrass and zoysiagrass tolerate full sun to light shade. Kentucky bluegrass and perennial ryegrass are recommended for lightly shaded or irrigated sites. If part of your lawn is shaded, that section usually needs a different height from the sunny part.
04 / How mowing height changes with season, shade and grass type
The ranges in the chart above are a starting point. Oklahoma State University Extension adds several adjustments worth knowing:
- Taller in shade. OSU recommends keeping grass in shade at a slightly higher cut.
- Warm-season grass higher in fall. OSU advises cutting warm-season grasses higher in fall to insulate them against low temperatures, and lower during summer growth to promote lateral spread. In a heat wave or drought, the top-of-range advice in our chart still applies.
- Too low costs roots. Cutting below the recommended height discourages deep rooting and can thin the turf.
- Too high can backfire on bermuda. OSU notes that bermudagrass cut too high gets stemmy and becomes prone to scalping. Its example of the one-third rule: cut U-3 bermudagrass at 1 inch each time it reaches 1.5 inches.
For cool-season lawns, OSU gives these specific heights, which sit inside the ranges in our chart:
| Cool-season grass | May–August | September–April |
|---|---|---|
| Tall fescue | 3.0 in | 2.5 in |
| Kentucky bluegrass | 2.5 in | 2.5 in |
| Perennial ryegrass | 2.5 in | 2.5 in |
A number on a chart only helps if your mower actually cuts at it. Before you change anything, measure and set the real cutting height on a flat surface. Or skip the fiddling and have a local crew mow at the right height for your grass.
Frequently asked questions
What is the best mowing height for tall fescue?
Tall fescue does well at 2.5–4 inches. Oklahoma State University Extension recommends 3.0 inches from May through August and 2.5 inches from September through April.
How short can I cut bermuda grass?
Bermuda looks best at about 1–2 inches. OSU’s example is cutting U-3 bermudagrass at 1 inch each time it reaches 1.5 inches. Letting it grow too tall makes it stemmy and prone to scalping.
Should I mow higher in the shade?
Yes. OSU recommends a slightly higher cut for grass in shade. Bermudagrass needs full sun, while St. Augustinegrass and zoysiagrass tolerate light shade.
Is it bad to cut grass too short?
Yes. According to OSU, cutting below the recommended height discourages deep rooting and can thin the turf. It is the most common reason a lawn thins out.
Should I change my mowing height by season?
Often, yes. OSU advises cutting warm-season grasses higher in fall to insulate them against cold, and raising tall fescue to 3.0 inches from May through August.
Sources: Oklahoma State University Extension, HLA-6420; Oklahoma State University Extension, HLA-6419; NC State Extension Gardener Handbook; Penn State Plant Science.