A successful 2009 referendum cleared the way for a 15,000-square foot expansion of the school that wrapped up in 2013.

[2] LOLHS athletic teams are nicknamed the Wildcats and compete in the Shoreline Conference.

[3] The school fields a co-op football team with Valley Regional High School, nicknamed the Warriors.

[citation needed] In 2019, the Lyme-Old Lyme puts on a fall play and spring musical each year.

Lyme-Old Lyme High School's FIRST Robotics Competition Team 236, "The Techno-Ticks", won the Championship Chairman's Award in 2009.