Does it cost to park and if so how much

I've never had a parking fee charged, and I just checked the .gov site; it mentions no parking fee. Unless they've changed it extremely recently parking is free

For free

Ames Knoll is free parking year round. A great park to walk, hike, bike, run, fish, bird watch or just relax. A big pond there. No swimming though. Enjoy.

Parking is free

Daily parking fees charged year-round MA resident  $5 Non-MA resident  $10