When Can You Mow New Sod, and How Short to Cut It the First Time

At TurnKey Lawn Care, sod installation and the first months of mowing are part of the work we do across the metro. If you’re not sure your new lawn is ready, request a free estimate and we’ll check the rooting before the first cut.

This guide explains how to tell when new sod is ready for its first mow, how high to set the mower for each warm-season grass, how to make that first cut without damaging the sod, and how mowing changes over the first season.

The test that matters: is it rooted

How tall the grass should be

The LSU sod success guide suggests holding off on mowing until the grass is at least 3 inches high, and waiting a little longer if you can stand it. That extra height gives the grass more leaf to feed its new roots. It also ties into the one-third rule. LSU’s home lawn series advises never removing more than one-third of the leaf blade at one mowing. On new sod, taking off too much at once stresses a plant that is still building its root system. In practice, the grass should be tall enough that cutting it to your target height removes no more than a third of its length. If you want to keep St. Augustine at about 3 inches, for example, the first cut should come before it gets much past 4 inches.

Mowing heights for each grass

The right first-cut height depends on the grass you laid. LSU publishes these mowing ranges for Louisiana lawns:

Grass	LSU mowing height range	Suggested first cuts on new sod
St. Augustine	2.5 to 3 inches	Stay at the top of the range
Centipede	1 to 2.5 inches	Stay toward the top of the range
Zoysia	1 to 2.5 inches	Stay toward the top of the range
Bermuda	1 to 2 inches	Stay toward the top of the range

Keeping new sod at the higher end of its range for the first several mowings gives the grass more leaf area while roots develop. Once the lawn is fully knitted in, you can settle at your normal height. Our page on proper mowing height for Gulf Coast grasses explains why each grass prefers a different height.

How to make the first cut

The first mowing on new sod should be gentle. A few precautions protect pieces that are only partly rooted:

1. Do the tug test. Confirm the sod resists being lifted across the lawn, including the edges and seams.
2. Let it dry. Skip watering the evening before so the sod and soil are firm, since wet sod tears and ruts easily.
3. Sharpen the blade. A dull blade pulls and tears the grass instead of cutting it cleanly.
4. Set the mower high. Use the top of the range for your grass and remove no more than a third of the blade.
5. Turn gently. Make wide turns or lift the mower to turn, because sharp pivots can twist sod pieces off the soil.
6. Bag or clear heavy clippings. Thick clumps left on new sod can shade and smother it.

A lighter push mower is kinder to new sod than a heavy riding mower for the first few cuts, especially on soft ground. Our note on mowing wet grass after rain explains why wet soil and mowers don’t mix.

Walking on new sod

Foot traffic matters as much as the mower in the first few weeks. Every step on unrooted sod can shift pieces and press them unevenly into the soil.

• Keep children, pets and regular foot traffic off the new sod until it’s rooted
• Walk only where you need to for watering and checking, and vary your path
• Avoid dragging hoses or equipment across it
• Place stepping boards over areas you have to cross repeatedly

Once the tug test shows firm rooting across the lawn, normal use can resume gradually. Start with light traffic and watch the high-use paths, like the route from the back door to the gate, where new sod tends to wear first.

Adjust the watering once you start mowing

The first mow usually lines up with the switch from daily to less frequent watering. LSU’s home lawn series says that after 14 days, irrigation should be applied less often with longer gaps between waterings to encourage deeper roots. That shift also firms up the soil for mowing. Sod that’s watered two or three times a day stays soft, which is exactly when a mower does the most damage. Our post on how often to water new sod in the New Orleans heat gives a week-by-week plan.

Feeding after the first mow

New sod doesn’t need a heavy feeding right away. LSU recommends applying up to 0.5 pound of nitrogen per 1,000 square feet once the turf has rooted into the soil. That light feeding supports growth without pushing soft, lush blades that attract pests and disease. Our sod installation guide walks through the full process from preparation to the first feeding.

When the sod was laid changes the timing

The season the sod went down affects how soon it needs mowing. LSU’s home lawn series notes sod can be established year-round, but it’s more prone to drying out and winter injury if it’s laid while dormant, from October to March. How that plays out in a New Orleans yard:

• Spring sod: roots in as temperatures climb and usually needs its first mow within a few weeks, once the tug test passes
• Summer sod: grows fast in the heat and rain, so watch the height closely and don’t let it get far past the one-third limit
• Early fall sod: growth slows as nights cool, so the first mow may come later and the lawn may need only a few cuts before dormancy
• Dormant sod in winter: it isn’t actively growing, so there’s little to mow until spring green-up, and the priority is keeping it from drying out

Whatever the season, the rule stays the same. Mow when the grass is rooted and actively growing, and take off no more than a third of the blade at a time.

Mistakes to avoid on new sod

Most early problems with new sod come from a handful of habits:

• Mowing before the sod has rooted, which can lift or shift pieces
• Letting the grass grow very tall and then cutting it all the way down in one pass
• Mowing the morning after an evening watering, while the soil is soft
• Using a dull blade that tears the young grass
• Scalping the edges and seams, which dry out first and root last

Our page on what happens when you cut grass too short explains why scalping is especially hard on new turf.

Mowing through the first season

After the first few careful cuts, new sod settles into a normal routine. Regular mowing at the right height encourages the grass to spread and thicken, which helps close any gaps at the seams. Through the first growing season, keep mowing often enough that you’re never removing more than a third of the blade. In a New Orleans summer that often means weekly, since warm-season grass grows quickly in the heat and rain. Our page on how often to mow in New Orleans covers the typical schedule.

Frequently asked questions