Best spot

Marshfield: Jasper Rockhounding in Plymouth County, Massachusetts

Updated July 2026

Marshfield's beaches lie along the Massachusetts Bay jasper belt, where glacial gravels shed red and yellow jasper, epidote, and iron-rich feldspars onto the shore. A published mineralogical study of Marshfield beach and dune sand documents the epidote and feldspar content of this stretch of coast. The wide public beaches make it an easy, family-friendly surface hunt for waterworn jasper. Reported finds include jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Marshfield photos

Public image records connected to this spot or its reported material.

1 photo

Cobble and sand beach at sunset along the Marshfield shoreline near Fourth Cliff, Plymouth County, Massachusetts

Quick details

Access: Public area
County: Plymouth County
State: Massachusetts
Nearest road: Porter Street
Postcode: 02047
Coordinates: 42.11411, -70.66945

Best time to visit Marshfield

Best months: March to December. Typical highs run 84°F in midsummer and 41°F in midwinter, with winter lows near 22°F.

Climate normals: NOAA 1991-2020 monthlies, PLYMOUTH-KINGSTON station (9 mi away).

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Marshfield

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Jasper Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Marshfield.

Across the state line from Marshfield

Marshfield is close enough to the Massachusetts border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Marshfield FAQ

Where is Marshfield?+

Marshfield is in Plymouth County, Massachusetts, at 42.11411, -70.66945. Nearest road: Porter Street.

What rocks and minerals can you find at Marshfield?+

Marshfield is reported to produce Jasper.

Is collecting allowed at Marshfield?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Marshfield?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Marshfield?+

The most comfortable months at Marshfield are March to December.

How do I get to Marshfield?+

Open the directions link to navigate to 42.11411, -70.66945 in Google Maps. The nearest road is Porter Street.

More rockhounding in Massachusetts

See all 45 Massachusetts spots →

Open Marshfield on the map

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