I have had good experience with crimson clover in south central PA doing well. Planting it in early to mid September, it sprouts out good, gives the deer some food to eat, adds lots of N to the soil. In the spring, it really takes off and the deer love it. Helps them recover from a tough winter. I then usually til it into the soil and plant my summer annual mix. I really like it for logging roads that get a fair amount of sunlight. It can handle acidity better and doesn't need all the lime other clovers may need to do well.