We live in central Massachusetts and were wondering what the proper lawn mowing height is recommended going into winter dormancy and approximately 3 to 4 months of snow cover.
Central MA is Zone 10? Don't you think it's more like Zone 6?
From K-State Extension where I volunteer and from my turfgrass prof in college -- mow it short the last time you mow -- about two inches. You might want to check with UMASS Extension to see what specific height they recommend for your area, but I suspect it will be about 2".
The objective is to not have grass so tall that it mats down under snow cover and develops snow mold.