A restored former cranberry bog off Mill Street, with a flat, three-quarter-mile loop trail on an old service road around the wetland. Restoration turned the abandoned bog back into a natural marsh good for dragonflies and other wetland wildlife.
What to expect
Trails
Flat, wide, easy three-quarter-mile loop on an old service road.
Dogs
Allowed under voice control.
Accessibility
Trail is flat and wide but not posted as formally ADA accessible.
Birdwatching
Allowed Year-round, dragonflies and wetland birds
Managed by
Marion Open Space Acquisition Commission (MOSAC)
508-748-3500 · WebsiteCommon questions
Is Grassi Bog Conservation Area open today?
Grassi Bog Conservation Area is a public preserve in Marion, MA. Posted hours: Dawn to dusk..
How hard is the Grassi Bog trail?
Easy: it's a flat, wide loop of about three-quarters of a mile on an old service road.
Is there an entry fee at Grassi Bog Conservation Area?
No, entry is free.
Can I bring my dog to Grassi Bog Conservation Area?
Allowed under voice control.
Is Grassi Bog Conservation Area wheelchair accessible?
Trail is flat and wide but not posted as formally ADA accessible.
What rules should I know at Grassi Bog Conservation Area?
All activities on this Wetland Reserve Program parcel require prior NRCS approval.