I used to work in landscaping in HS during one summer, i would spread some weed and fungi killer at the end of summer beggining of fall, so it has time to work before temps fall below 40
then in the spring dump more grass seed and started fertizlizer to patch it up and get it thick, and do some overseeding, then after the first cut, by some summer guard (scotts has a really nice procut), and do a very VERY! light coating (becuase its still new grass and needs to establish roots) of it and water well, eventually all those buggers will be gone, and youll have a very nice green lawn by middle of next summer.
then in the spring dump more grass seed and started fertizlizer to patch it up and get it thick, and do some overseeding, then after the first cut, by some summer guard (scotts has a really nice procut), and do a very VERY! light coating (becuase its still new grass and needs to establish roots) of it and water well, eventually all those buggers will be gone, and youll have a very nice green lawn by middle of next summer.