How soon after my grass is seeded should i mow it for the first time?

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  15 answers
  • You should wait until it's at least 3 - 3&1/2 inches tall.

  • Janice Janice on Jun 06, 2021

    Wait until it REALLY needs a cut, then be sure the grass isn't wet and the blades on your mower are very sharp. Don't cut too short, mayble only 1/2" or so off the top.

  • William William on Jun 06, 2021

    Mowing seeds?! No, wait till it grows and needs to be mowed. At least 3" tall. Then only cut about 1/2' until it's established or you could tear it out of the ground

  • Redcatcec Redcatcec on Jun 06, 2021

    Wait until it is at least 3" high and then skim about 1/2" off with the mower, I would also not compost what you have cut off, let the mower spread out what you have cut off.

  • Em Em on Jun 06, 2021

    Rule of thumb is 4 weeks after planting seeds.

  • Kathy Gunter Law Kathy Gunter Law on Jun 07, 2021

    Go with height rather than time to dictate your mowing. Depending on rain and such, a month may not be the right timing. I agree with comments above on 3" as well as not using a bagger but let the mower spread your clippings.

  • Dee Dee on Jun 07, 2021

    For seeded lawns, it may take up to 2 months before they are ready to be mowed. Sod may be ready to be mowed within 2 to 3 weeks of planting. Three to six weeks are required for sprigs, stolons, and plugs to become established. For seeded lawns, wait for all of the seeds to germinate before mowing.

  • Maura White Maura White on Jun 07, 2021

    I would wait until it's established and longer than what you think looks too long. I like the 3" idea mentioned above. Be sure it's getting plenty of moisture though, because if you trim it back down, and on hot scorching days, you can easily kill off the new grass.

  • Chloe Crabtree Chloe Crabtree on Jun 07, 2021

    Seeded lawns require the longest time period between planting your grass and mowing. Because you must wait for seeds to germinate, you cannot cut the grass until two months have passed. If you planted your seeds during their active growing season, the blades should reach a 3 to 3.5 inch height after eight weeks.

  • Betsy Betsy on Jun 07, 2021

    Hi Thomas: I'd wait until the grass has gotten to 4 or 5 inches tall. Usually about 2 months after planting, to give it a good start with the roots. If you do it earlier, the mower will pull the grass out of the ground :( And, mow it high for the rest of the year. I wouldn't cut more than 1/3 of the blades. Anyway, that's MHO :)


    Good luck

  • Mogie Mogie on Jun 12, 2021

    In most cases, it would take approximately one to two months after your seeds sprout. This duration is long enough for the turf to adhere to the soil firmly so that it can withstand the force of a trimmer. One more thing, lock your sprinkler system or hose reel to enable your lawn to dry out for two days before you mow it for the first time.


  • Deb K Deb K on Jun 14, 2021

    Hi Thomas, Whether you've seeded bare spots or a whole lawn, hold off on mowing the area until the new grass has reached a mowing height, between 3 and 3½ inches. Make sure your mower blade is nice and sharp, and then cut your grass only when it's dry. Avoid mowing your new grass too short - removing no more than ⅓ of the height.

  • Lindsay Aratari Lindsay Aratari on Jun 30, 2021

    I would wait until you have several inches of grass