How to measure and set your mower’s cutting height

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GUIDE · 5 MIN READ · UPDATED OCT 6, 2026

Park the mower on a flat, hard surface, measure from the ground to the bottom edge of the blade, and adjust the deck until that number matches the height your grass needs.

Grass	Target height
Bermuda, zoysia, centipede	1 to 2 in
Perennial ryegrass	1.5 to 2.5 in
Kentucky bluegrass, fine fescue	2.5 to 3.5 in
Tall fescue, St. Augustine	2.5 to 4 in

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Why the number on the deck is not enough

Most mowers have a height lever or wheel adjusters with numbered settings. Those numbers are rarely exact. Two mowers set to the same number can cut at different heights, and wheels that have worn or a deck that has bent can shift the cut further.

Measuring takes a few minutes and tells you what height you are really cutting at. Once you know it, you can match it to the right range for your grass. Our guide to mowing height by grass type lists the target for each common lawn grass.

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How to measure your mower’s cutting height

• Turn it off safely: Shut off the engine, remove the key or disconnect the spark plug wire, or remove the battery on electric models.
• Use a flat, hard surface: A driveway or garage floor gives a true reading. Grass and soil do not.
• Measure to the blade: With a ruler, measure from the ground straight up to the lowest edge of the blade tip. Rotate the blade carefully by hand with gloves on so the tip lines up with the side of the deck.
• Check both sides: Measure at the front and back and on both sides. A difference means the deck is uneven.

You can also check the result on the lawn. A day after mowing, push a ruler into the grass to the soil and read where most blade tips land. Because the wheels sink into turf a little, the lawn cut is often slightly lower than the driveway reading.

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How to set the height

• Single lever: Many push mowers have one lever that raises the whole deck. Move it a notch and re-measure.
• Wheel adjusters: Some mowers need each wheel set separately. Set all four to the same position.
• Riding mowers: Use the deck lift lever, and check deck leveling if one side cuts lower than the other. Your owner’s manual explains how.
• Write it down: Once you find the setting that gives the right height, note it so you can return to it after seasonal changes.

If your grass is a warm-season type such as Bermuda, you will be near the low end. If it is tall fescue or St. Augustine, you will likely be near the top setting.

Change the height with the seasons. Many lawns benefit from a slightly higher setting in the heat of summer and a return to the normal setting in spring and fall. Measure again after any big change, and after replacing or sharpening the blade, since a new blade can sit a little differently than the old one.

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Common mistakes when setting mowing height

• Trusting the number on the lever without measuring
• Measuring on grass instead of a hard surface
• Forgetting to raise the height in summer heat
• Not checking for an uneven deck, which leaves stripes of short and tall grass. See our guide to lines after mowing.

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Signs your mower is set too low

• Brown or tan patches right after mowing
• Scalped high spots and edges. Our page on a scalped lawn explains how to recover.
• Visible soil or stems instead of green leaf
• Weeds moving into thinned areas

If you see these, raise the deck one setting and re-measure. It is easier to lower the height gradually than to recover from a scalp.

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When to call a pro

If your deck will not level, the height range on your mower does not match your grass, or you just do not want to deal with it, you can let a pro dial it in. A crew that mows your lawn regularly will keep the height consistent.

You can see what lawn mowing service costs first. Recurring mowing is about $30 to $85 per visit for an eighth to a quarter acre (HomeGuide, 2026).

Related

• Tall fescue mowing height
• Bermuda grass mowing height
• Kentucky bluegrass mowing height