Dates: https://www.usga.org/handicapping-articles/handicap-active-and-inactive-season-schedule-25489.html
For example we are April 1 to November 14, which I think is good. We used to end in October, maybe even the middle of October, so the extension through November 14 is welcome, particularly in Erie where the lake helps us stay warm. We were playing in shorts in early November this year, too.
Sometimes we can play golf in March and the conditions are good, but April 1 still seems "right."