Dormant seeding is defined as seeding in late fall after soil temperatures have been too cold for germination. There is no advantage to dormant seeding since seed will not be able to germinate until late spring when soil temperatures warm to levels that allow for germination. If seed survives, mortality rates are high since some seed may germinate and then seedlings could either frost heave or be killed by freezing temperatures. If turf cover is thin, seed may wash or erode off-site, rot, or get eaten by birds.
The best time to seed is late August to mid October. Second best time is March through early April.