Late aug till mid sept. Sept is the best grass growing month of the yr. If you can get it to germinate early sept , that's best. We will start in another week.

 

Id bet your soil temps are at about max right now....I would wait 2-3 weeks and see how the soil temps look, as well as rainfall outlook. If you seed when soil temps (and air temps for that matter) are very warm, you wont get a good germ rate at all. If you seed when no rainfall is forecast, well...best of luck with that we all know no one waters new seed right out of a hose.

 

The best time is from the last week of August to the 2nd week in September. Depending upon which grass types you choose to use, you'll need 6 to 8 weeks to grow it in. Apply a starter fertilizer on the day you seed and follow it up with another application of it 30 days later.

 

Now is the time. You want maximum soil temperatures for quick germination. Seed now; keep it moist, and under ideal conditions it will be an inch tall in a week. Under average conditions--it would be about 2 weeks. Still, near perfect, as cooler rainy weather starts about the first week of HS football season.

Try to seed 6 to 8 weeks before frost. October 9 in Hartford Ct.
http://farmersalmanac.com/average-frost-dates/

My neighbor seeded 3 weeks ago, Pennington Sun and Shade from Home Depot (high in perennial rye). It is now thick and about 3 inches tall. Somewhat weedy and tiny crabgrass plants, but in a few weeks frost will kill the crab and most weeds.

Cobra is right--plenty of fertilizer will result in more grass sooner. And extra seed is wise since conditions may not always be the best. Keep it wet.

 

Don't agree with seeding when soil is hot and air temps are high. I NEVER get good germination with those conditions. No way am I seeding when it is hot and dry out with hot soil temps.

 

I'm in ct so our season is def different. Last year grass was growing till the end of October.
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Because aerating will be part of your process I'd recommend waiting until September. Normally I'd say Labor Day but it is late this year. Roots are generally short and weak right now but we are coming into a great time of year for increasing root depth. I'd be concerned if you do not wait you could tear things up badly - especially if they have grubs. You may want to figure that out now, sell them a curative application, then return to aerate and seed.

That's my opinion. I go a little later than some guys here but all mine have irrigation and I babysit them several times a week. Everyone who has posted here has had success with their method. If you get it germinated before the end of September you will have good results.

 

in the northeast, id say early september

 

in the northeast, id say early september

Also a lot of areas in the northeast have gotten heat waves and little to no rain. I've had customers ask me about seeding and i tell them to wait until at least the beginning of September, when its cooler!
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Yea I swear the seasons/weather has moved forward by 3-4 weeks. Latest start to the mowing season I can remember...and now we've been getting mid summer weather in late summer.
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