Fall Update October 2014
I have found this to be the best time to plant grass. The seeds will germinate and the roots systems develop as the winter snows melt, so that by mid-spring the grass will be well established before the hot sunny days of summer arrive. This ensures a very healthy green lawn come those lazy, hazy, hot days of summer!
Another tip: please clean-up the old leaves that fall on your lawn. If you let them remain over winter you run the risk of your lawn getting fungal and mold infestations, which will ruin your beautiful lawn and cost you more money in the spring.