I was always under the impression. The rule of thumb is to get the seed down 45 days before your average first frost.
Basic would be more low dethatch aerate drop lime and seed. After first mow in a few weeks you can start to apply fertilizer

Cool Season Lawn Guide

Cool Season Guide We would like to welcome you to the forum. We are a group of lawn enthusiasts (aka. obsessed) that like to share our knowledge and experiences. This article is meant as the how-to guide to lawn care for cool season lawns. The intent is to provide a high level summary of the...

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Cool Season Overseed Guide

Introduction There seems to be a lot of interest here on the forums for an overseed guide so I'm going to give it my best shot. Keep in mind, this is primarily for TTTF or PRG lawns. Some of these ideas will work with KBG but that's a totally different animal so someone with more KBG experience...

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I was always under the impression. The rule of thumb is to get the seed down 45 days before your average first frost.
Basic would be more low dethatch aerate drop lime and seed. After first mow in a few weeks you can start to apply fertilizer

Cool Season Lawn Guide

Cool Season Guide We would like to welcome you to the forum. We are a group of lawn enthusiasts (aka. obsessed) that like to share our knowledge and experiences. This article is meant as the how-to guide to lawn care for cool season lawns. The intent is to provide a high level summary of the...

www.thelawnforum.com

Cool Season Overseed Guide

Introduction There seems to be a lot of interest here on the forums for an overseed guide so I'm going to give it my best shot. Keep in mind, this is primarily for TTTF or PRG lawns. Some of these ideas will work with KBG but that's a totally different animal so someone with more KBG experience...

www.thelawnforum.com

Mac you always have good insights - as I prep for fall over seed are there any steps that would help with summer soil retaining moisture. Some of the areas of my lawn are dry and hard. It’s a high clay composition and over the last 3 falls I have spread a thin layer of peat and some sand. Is there another remedy other than watering it more/deeper?

 

I'd say starting tomorrow is the ideal time to start the process due to your weather. Like MacLawn said, aerate. If you have the ability, rent one yourself and aerate until your body hurts. Get tons of holes/plugs and then throw seed down. Only compost in the needed areas.

Try throwing down some humichar or HumicDG right after aerating. I do this a few times a year for heavy soil. Focus on your soil and loosening it up.

For your irrigation, confirm how long it takes to get 1 inch of water for each zone.

 

Try throwing down some humichar or HumicDG right after aerating. I do this a few times a year for heavy soil. Focus on your soil and loosening it up.

Humichar or HumicDG is extremely expensive. How much do you think it would take to make any beneficial impact on 25,650 pounds (12.8 tons) of soil per 1000 sqft at a 6 inch depth? In the OPs case, 115.2 tons of soil.

 

There was a hydroponic all organic supply store near me years back they pushed the biochar for organic soil growing . I got a estimate of needing 30 yards of it to make a difference . They also offered a 50/50 mix of compost and biochar . It was not affordable on a large scale . I dont think the place lasted 2 years…..