When Can You Mow New Grass After Overseeding?

The first mowing after overseeding matters because young seedlings are easy to pull, bend, or crush. Instead of choosing a date on the calendar, use the height and strength of the new grass as your guide.

Wait for the seedlings, not the calendar

A practical rule is to wait until the new grass is tall enough that mowing will remove only a small portion of the blade. For tall fescue, that often means waiting until seedlings are roughly in the 3 to 4 inch range before the first cut. Growth speed varies with weather, soil, irrigation, and planting date, so inspect the lawn rather than counting days.

Make the first mow gentle

• Use a sharp blade.

• Mow only when the soil surface is firm enough that the mower will not rut or twist seedlings.

• Avoid aggressive turns and repeated passes over the same area.

• Remove only about the top third of the blade at one time.

What about the old grass?

The established grass may grow faster than the seedlings and look ready to mow sooner. If it gets too tall, it can shade new seedlings. That is one reason mowing lower before overseeding helps: it gives the new grass time to emerge before the old canopy becomes tall again.

After the first mow, return gradually to the mowing height appropriate for your grass type and season. Consistent mowing is part of recovery, not just a cosmetic step.

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