Lawn Care in Central Ohio: May 2026 Checklist

May is the month your lawn either takes off or gets away from you. I run Lawn Harmony out of Circleville, and I have been mowing yards across Pickaway, Franklin, Fairfield, Ross, and Fayette counties for more than ten years. This is the checklist I actually use on my own routes in mid-May, based on what I am seeing in yards right now and what OSU Extension recommends for cool-season turf in our region.

What height should I mow my Central Ohio lawn in May?

Cut your cool-season lawn at 3 to 3.5 inches in May, and never remove more than one-third of the blade in a single pass. Tall fescue and Kentucky bluegrass, which is what most of our Central Ohio lawns are, hold moisture and shade out crabgrass better when they are left a little longer.

I had a yard in Grove City this past week that the homeowner had scalped down to about 1.5 inches before I took over the route. The crabgrass and clover moved in within ten days. We bumped the deck up to 3.25 inches, and within two cuts the canopy started closing back in. Height is the single cheapest weed control you have.

If your grass is getting away from you because of the rain we have been getting, do not try to bring it down in one cut. Take the top third off, wait three or four days, then take another third. Anything more and you stress the crown, which is where new tillers come from. Learn more about our mowing approach at /services/lawn-mowing.

Should I be fertilizing in May in Central Ohio?

A light spring feeding in May is fine, but the heavy nitrogen push should happen in fall, not now. Per OSU Extension guidance for cool-season lawns, the big fertilizer windows are September and late October/early November, with a lighter application possible in May if your lawn is thin or pale.

If you skipped fall fertilizer, a slow-release product with around 0.5 to 0.75 pounds of nitrogen per 1,000 square feet is a reasonable May application. Heavy spring nitrogen pushes top growth at the expense of roots, and then those shallow roots cook in July when we hit our usual stretch of 90-degree afternoons.

On a Canal Winchester job last Friday, the homeowner asked me to put down a bag of high-nitrogen turf-builder. I talked her into a slow-release blend instead. The goal in May is steady color and density, not a green explosion that you have to mow twice a week.

How do I get rid of dandelions and clover this time of year?

For broadleaf weeds like dandelion, clover, and creeping charlie, May is actually a good treatment window because the plants are actively growing and pulling herbicide down to the roots. A selective broadleaf herbicide applied on a calm day with temps in the 60s to low 80s will give you the best kill.

A few things I tell my customers every spring:

• Do not spray right before a mow. Give the herbicide 24 to 48 hours to translocate.
• Do not spray if rain is in the next-day forecast from NWS Wilmington.
• Spot-spray instead of blanket-spraying when you can. Cheaper, less stress on the lawn, and better for pollinators.
• If you have a lot of clover, ask yourself if you really want it gone. Clover fixes nitrogen and is drought-tolerant. A lot of my customers are choosing to leave it.

How often should I water my lawn in May in Central Ohio?

Most weeks in May you do not need to water at all. We are averaging 4 to 5 inches of rain in May per the NWS Wilmington climate normals, and cool-season grass uses less water in spring than it will in July and August. If you do irrigate, aim for one inch of total water per week, including rainfall, applied in one or two deep sessions rather than daily sprinkles.

Daily light watering trains shallow roots, and shallow roots are what kill lawns in summer. A tuna can on the lawn under your sprinkler is the cheapest rain gauge there is. When it has an inch, you are done for the week.

What about mulch, beds, and edging in May?

May is the right month to refresh mulch beds before the summer heat locks the soil in. Two to three inches of hardwood or dyed mulch over weed-free beds will hold moisture, suppress weeds, and clean up your curb appeal in an afternoon. Pull the mulch back an inch or two from the trunks of trees and the crowns of shrubs. The “mulch volcano” you see piled up against maples in subdivisions is killing those trees slowly by rotting the bark.

We are doing mulch installs across Pickerington, Lancaster, and Chillicothe right now. Pricing is by written quote per property because cubic yardage, bed prep, and access all swing the number. You can see our process at /services/mulch-install.

While you are at it, get a clean edge along your driveway and sidewalks. A sharp edge makes a so-so mow job look professional and a good mow job look great.

Should I be aerating or seeding in May?

No. Save aeration and seeding for late August through mid-October. Spring seeding fights crabgrass pre-emergent, gets baked by July heat before the roots are established, and rarely fills in the way fall seeding does. The one exception is a small bare patch that you can baby with daily watering and shade cover.

If your lawn is thin and you are itching to do something now, mow tall, fertilize lightly, and put aeration and overseeding on the calendar for September. That is when our soil temps drop into the 60s and cool-season seed actually wants to germinate.

What pests should I be watching for in May?

The two we see most in Central Ohio yards this time of year are grubs (which you treat preventively in June or July, not now) and early-season billbugs in newer Kentucky bluegrass lawns. If you see irregular brown spots in a sunny lawn that pull up easily like dry sod, that is more likely billbug or drought stress than grubs.

The bigger May problem is fungal pressure during these warm, wet stretches. Red thread, dollar spot, and brown patch can all show up. Most fungus on a healthy lawn clears on its own once the weather dries. Avoid evening watering, mow tall, and do not bag your clippings unless the lawn is wet or seeded.

What is on my own mid-May route this week?

A real-week sample of what I am doing right now across the service area:

• Mowing weekly in Circleville, Ashville, and South Bloomfield, decks set at 3.25 inches
• Two mulch installs in Grove City and Upper Arlington, hardwood double-shred
• One soft wash on a vinyl ranch in Bexley, plus the concrete drive
• A stump grind in Lancaster left over from a winter tree removal
• Three commercial mow accounts in Columbus running on a 7-day cycle

That mix is pretty typical for the second half of May. The mowing tightens up, the landscaping picks up, and the power washing calls start rolling in once people are sitting on their patios on Memorial Day weekend.

Get a written quote from a local owner-operator

If you want a Central Ohio crew that actually shows up when we say we will, write quotes in writing, and treats your lawn like it is on our own street, give us a call. We are licensed, insured, and 5.0-star rated on Google.

• Free residential quote: quick-mow-quote.emergent.host
• Commercial property walkthrough: /quote/commercial
• Phone or text: 614-425-9789
• Email: Lawnharmonyohio@gmail.com
• Serving Pickaway, Franklin, Fairfield, Ross, and Fayette counties: Circleville, Columbus, Grove City, Bexley, Upper Arlington, Pickerington, Canal Winchester, Groveport, Lancaster, Baltimore, Chillicothe, Washington Court House, and Jeffersonville
• $40 mow minimum. Everything else is a written quote per property.