So one section of my yard, ~100' x 70' , is extremely rough to mow. It would appear that the previous owner had some apples trees planted in that section and the trees didn't survive, combined with some moles, etc and there are some large humps / ridges in that area. That area of the yard also is pretty dry compared to other parts of the yard and when digging a 2-3 foot hole the soil looks mostly like clay. What I've thought about doing is using the backblade on my tractor to re-grade that area to even out the rough spots. Then tilling in some kind of compost / sand mixture, re-grade, seed, cover with straw and water. So when is the best time to do this? I'd like to do it sooner rather than later. However, I understand that grass grows better in the fall. Thoughts?