Overseeding: what to know

What the job involves, what changes the price, and what to ask a pro.

What overseeding is

Overseeding spreads new grass seed over an existing lawn to fill thin and bare patches and thicken the turf. People hire it after aeration, after a dry season, or when weeds and bare spots keep showing up in the same areas.

Signs you need it

  • Bare patches or thin spots appear, often in sun-heavy or high-traffic areas
  • Patchy grass has not improved after mowing and fertilizing
  • Weeds keep filling the gaps because the turf is not dense enough to crowd them out
  • The lawn has been aerated or dethatched and now has open soil that needs seed
  • The grass in your lawn is not the type you want, and you want a mix that suits your sun and foot traffic

What the pro does

  • The pro checks the lawn for bare spots, weeds and the grass type, then picks a seed mix suited to the sun and wear the lawn gets
  • The lawn is mowed short, and heavy debris or thatch is removed so the seed can reach the soil
  • The soil is raked lightly, or the seed is spread after aeration so it sits in the holes
  • Seed is spread with a broadcast or drop spreader at the rate on the seed label, in two directions
  • The pro sets a watering plan, usually light and frequent, and tells you when to mow again

What changes the price

Every job is different, so we do not publish prices. These are the things that move the quote up or down.

  • Lawn size and how many bare or thin areas need seed
  • The seed mix, which changes with the sun, shade and traffic the lawn gets
  • Whether the lawn is aerated or dethatched before seeding
  • Soil conditions such as compaction or poor drainage that need fixing first
  • Whether starter fertilizer, topdressing or compost is added
  • Access and slope, which decide whether the spreader can cover the area evenly
  • Whether a second seeding pass or a follow-up visit is included

What a written quote should spell out

  • The seed mix and the grass varieties in it
  • The area covered and whether bare spots, thin areas or the whole lawn are seeded
  • Whether aeration, dethatching or raking is included before seeding
  • The watering schedule for the first weeks and who is responsible for it
  • Whether starter fertilizer, compost or topdressing is included
  • The timing and any follow-up visits

Questions to ask before you hire

  • Which seed mix do you recommend for my sun, shade and foot traffic, and why?
  • Will you rake or aerate before seeding, and do you remove thatch first?
  • How do you spread the seed, and will it cover the lawn evenly?
  • What watering schedule do I need to keep the seed moist, and for how long?
  • When can I mow and walk on the new grass?
  • Do you recommend a starter fertilizer, and what product is in it?
  • What do you do if the seed does not take in the bare spots?

Red flags

  • They scatter seed on a lawn with no soil prep and say it will take on its own
  • They offer one generic seed mix for every lawn without asking about sun or foot traffic
  • They cannot say how the watering will be handled after they leave
  • They cannot name the varieties in the seed mix or show you the seed label
  • They plan to seed in the heat of summer without a watering plan that can keep up

What you can do yourself

A homeowner can overseed a small lawn with a hand spreader, using a seed mix chosen for their sun and foot traffic, and watering lightly and often while the seed germinates. Call a pro for large lawns, for heavy compaction that needs aeration, or when drainage problems need fixing before the seed goes down. Follow the seed and starter product labels for rates and timing.

Licenses and permits

Overseeding is commonly not licensed work; if the job includes weed control or other pesticide products applied for pay, many areas require an applicator license. Check with your state or local licensing agency.

Overseeding questions

Should I aerate before overseeding?

Aeration helps seed reach the soil and gives it a better chance to root, especially on compacted lawns. Ask the pro whether your lawn needs it and whether they will do it on the same visit.

How long before the new grass fills in?

It depends on the grass type, the weather and how consistently the lawn is watered. Ask the pro what to expect in the first weeks and when the lawn should look fuller.

Can I overseed in the summer?

Summer heat and dry soil make seed hard to establish, so timing matters. Ask the pro whether your grass type should be seeded now and what watering they will need to keep it moist.

About this guide

This national guide is written and checked by infinibell. Rules and conditions differ by place, so local pros are credited on guides for the cities they serve, not on national ones.

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