I'm going to aerate my yard this fall but I have a couple questions about timing and applications. 1) When is it to late to aerate? When is the perfect fall timing (NW MN) 2) I want to over seed an area as well. Should I add the seed before running the aerator? 3) Id like to add a pre-emergent herbicide as well. When should I add this? Same time as aeration? Will this harm the grass seed. Spell it out for me guys, those three questions.