I live in central Iowa and have tried everything over the years from mil to Scott's. From my experience, I have found Site One products superior....ie used to be John Deere landscape I believe. I finally invested in a professional grade spreader and gave up on consumer grade spreaders. Now I have an acre of blue grass in which I over seeded last fall with fescue for a variety of reasons not applicable to the original OP inquiry. I did drop pre emergent this year, and probably will most years. However, I typically spray weeds and only fert eary spring, 2 months later I fert which lasts until September. Someday, I hope to go all natural, however, I havent seen it to be there yet. This spring I did not put down pre emergent until around May 21, which does have some fert, and my yard was the greenest on the block prior, oh BTW, I mulch mow, which is key i believe. Hope this helps.