Comprehensive digital records from ebird.org show that the Ruffed Grouse can be seen in this area year round. My own records say otherwise.
When I look at the dated pictures I have taken in my yard, there is a conspicuous gap in the warmer months. Mind you, my yard pictures are taken at the valley bottom, while ebird treats all altitudes. (This is a mountainous region.)
There is information here about the behaviour of the Ruffed Grouse: The bird seems to head to the uplands in the warm months and return to the valleys when the snow falls (I have not seen this behaviour discussed anywhere).
It is December and a Ruffed Grouse reappeared in my yard. I expect to see it and its kin for maybe another six months before they head to the uplands again.