A lot of it depends on what types of grass you’re dealing with……any crabgrass in my field is dead as a hammer now and brown. Things like Bermuda, Bahia, nutsedge are what will come back on you without spraying. If you have a lot of those then you might want to burn it down with some gly. The later you wait to plant the better if you’re not gonna spray. I’d wait until the first week of Oct to plant. If you’re not a big bow hunter then waiting until the second or third week would be even better when not spraying.