What is the latest time in the summer that one should plant grass seed?

Question:

What is the latest time in the summer that one should plant grass seed?

Answer:

Donna R. Coffin, Extension Professor

Our factsheet on establishing home lawns suggests “spring (May) or late summer (August 15 to September 15)” is the best time. If you live in Aroostook County, I would suggest early September as a last date to seed your lawn.