Mount Greylock Regional School ski teams have utilized
Prospect Mountain in
Vermont. The
Ephs of
Williams College use the high school facilities for
cross country. Mount Greylock's boys Nordic Ski Team has won a state record 22 state championships, including seven straight from 2011 to 2017. The Mounties won in 2020, there was no state title in 2021, won again in 2022 and 2023, lost to Newton South in 2024, and won again in 2025. On the girls side, Mount Greylock won its 14th state title in 2025, giving the school back-to-back state titles after winning 2024. The Mount Greylock volleyball team was one of the most consistent teams in the state from 2021-on, making it to the PVIAC Class C Western Massachusetts Volleyball Final in 2022, losing to Frontier. The Mounties then went undefeated in 2023, with a perfect 25-0 campaign that included a Class C Western Mass. Title win over county-rival Lenox, the No. 1 overall seed in the Massachusetts Interscholastic Athletic Association Division V State tournament and a championship over Bourne in that game. Mount Greylock won the Class C title again in 2024, beating Lenox in five sets. == Athletic state championships ==