Normally I do starter Fert, aerate, and seed all at the same time. Mohave wondered about doing the starter a little early and if it matters. I don't have many seeding jobs...maybe 20-25 or 250k total. I can usually get them done in a week or less. I will be coming out to spray any weeds in the lawn and have alway thought about doing the starter then to try and save a little time. If the weather and equipment holds I would spray, wait 7 days and start seeding. Anything wrong with applying starter that early? It's 18-24-12 and 48% xcu I think. I would then follow up in November with more Fert, 1-1.25 lb N.