Confirmed reports of mountain lions in Massachusetts
There are two records of mountain lions in Massachusetts that meet the evidence requirements. MassWildlife cannot investigate or confirm mountain lion reports without any evidence.

Case 1
In April 1997, experienced tracker John McCarter found scat near a beaver carcass at the Quabbin Reservation. McCarter sent a sample to Dr. George Amato of the Wildlife Conservation Society in New York and Dr. Melanie Culver of the University of Maryland. Both labs confirmed the sample came from a mountain lion.

Case 2
In March 2011, DCR forester Steve Ward photographed a track trail in the snow near the Gate 8 boat launch area of Quabbin Reservoir. These tracks were fresh and well photographed. Tracking experts Paul Rezendes, Charles Worsham, George Leoniak, and Dr. Mark Elbroch examined the photos. These tracks may have been made by the mountain lion documented in Greenwich, Connecticut on June 5, 2011, and killed by a vehicle six days later.

The Connecticut mountain lion

The Connecticut mountain lion is the best documented wild Mountain Lion in New England. The young adult male was killed by an SUV on the Wilbur Cross Parkway in Milford, Connecticut on June 11, 2011. Someone photographed the animal at the Brunswick School on Greenwich, Connecticut about 40 miles away on June 5th. The USDA’s Forest Service Wildlife Genetics Laboratory found that the animal came from South Dakota. This mountain lion was documented by DNA samples from Minnesota and Wisconsin between December 2009 and early 2010. Sighting of this animal also occurred in Michigan and New York. Over a period of a year and a half, this mountain lion left DNA evidence in at least four states.

Mountain lions don’t usually travel more than 100 miles from where they are born. Yet this young male traveled about 1,800 miles. This is the longest documented travel distance of a mountain lion.

https://www.mass.gov/service-details/are-there-mountain-lions-in-massachusetts