I've got 20,000 ft to seed this week. After that I'd rather not seed until well into November. There is a window where it's warm enoguht to germinate but too cold for turf to establish before freeze-up. Once soil temps go down to keep the seed dormant I'll put it down and feel comfortable that it will sit there until spring and start just fine. I'm in NW Vermont, average first frost date here is September 17, we're running on borrowed time now, no frost yet here in the Champlain valley