From Turf iNfo and Bill Kreuser, assistant professor and turfgrass Extension specialist, University of Nebraska-Lincoln:
Fall is time to seed cool-season turfgrasses. It’s ideal because the air temperature and humidity are lower than summer, the soils are still warm to favor quick germination, and weed pressure is less in the fall than spring. While the fall seeding window will close soon, it is still open for much of Nebraska. The Climate Prediction Center forecasts (www.cpc.ncep.noaa.gov) support this assertion with better odds for warmer than average temperatures during the next few months. Here are some quick tips for establishing new turf this fall:
Read the rest and see figures here