overseeding a lawn in vancouver
My front yard is... a mess. The house is new to us, we just bought it last fall, and it looks like the last owners did not take good care of the yard. It had a weed problem (mostly dandelions and similar), and is not at all level. I took care of (most of) the weeds last year, but now I find myself with a lawn that has several bare patches, and a few pitted areas. Even the best parts are a bit shabby. It is not at the "vacant lot" look right now, but a few more years and I think it would definitely get there.
I do not want to go to the expense and waste of scraping it and putting in fresh sod. My plan is to core-aerate it, scrape up the bare and particularly thatchy patches, and put down grass seed (and topsoil where needed).
So I have two questions: first, does this plan make any sense? Second, am I too late to do it this season; should I wait until September? The yard is East-facing, so it gets the morning sun, but it is pretty shaded in the afternoon. Nevertheless, the weather is heating up and I am thinking I may have missed my opportunity - I was busy fixing up the backyard this Spring and the weeks got ahead of me :)
Thanks for your help!
p.s. as for seed - is the general grass seed at HD good enough, or do I need to spend more at a garden centre? Note that this is not a new lawn, but rather a somewhat major repair.