Technically, it's now too late in all of New England (and some of the mid-Atlantic states as well).

You might--might--be able to sneak it in if you use TTTF or perennial rye, but losses over winter are likely to be rather severe.

One thing you can do is wait for the weather (and soil) to get cold, then seed. Dormant seeding will sprout in early spring once the soil gets just barely warm enough. It's not optimal, but usually does decently well--just remember to water it over the first summer!

Thank you. I guess I can wait for early spring