Wait until all the grass is germinated. Feeding earlier than that will set off growth of the existing lawn, which will happily overgrow the new stuff and shade it out.

Unfortunately, that's not an optimal fall feeding schedule for northern grasses, but it'll have to do when working with your chosen seeding dates.

Feed a second time when growth stops but the grass is still green.

Yes, I've ran out of time. I'm currently killing crab grass and yellow nutsedge. I plan to finish spraying those by the end of this week, the middle of next at the latest. Then I'm going to rent a dethatcher and run over the lawn to loosen up the dead clumps of of crab grass on September 18. I'll rake and clean everything up as well as I can. Then I plan to aerate on September 25 and over seed on the 26th or 27th. It's pushing me tight, but unless we have an unseasonably early winter, that should give my new grass plenty of time to take root and get started before going dormant.

Next year I'll be using a Dimension based pre-emergent in about mid-April and again in mid- to late-July, so I shouldn't have near the problems with crab grass next year that I had this year. I'll spot treat the nutsedge with Tenacity as needed. I'm still bordered on two sides with crab grass filled empty lots, so I know that's going to be a struggle, but I have some ideas about that too.

As long as I can get through this season, and get my seed in the ground before the end of the month, I feel pretty good.

I'm going to take some pictures as I go along and will post them to show the different stages later.

Thanks for the advice.

- Byron