Middlesborough: Agate & Chalcedony Rockhounding in Plymouth County, Massachusetts

Updated June 2026

Middlesborough is a mapped rockhounding spot in Plymouth County, Massachusetts. Reported finds include agate, chalcedony. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Plymouth County
State: Massachusetts
Nearest road: Walnut Street
Postcode: 02346
Coordinates: 41.85030, -70.89042

Geology at Middlesborough

This spot sits on Rhode Island Formation, mapped as sandstone and graywacke that formed roughly 325 to 300 million years ago. Tough silica like agate, jasper, and chert typically weathers out of beds like these and collects as float in drainages and on deflation surfaces.

Mapped unit: Rhode Island Formation
Age: 325–300 Ma (Pennsylvanian)
Rock types: sandstone and graywacke
Elevation: 100 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Middlesborough

Best months: March to November. Typical highs run 82°F in midsummer and 38°F in midwinter, with winter lows near 17°F.

Climate normals: NOAA 1991-2020 monthlies, MIDDLEBORO station (2 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 Middlesborough

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

Nearby rockhounding spots

Other rockhounding spots within driving distance of Middlesborough.

Across the state line from Middlesborough

Middlesborough 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.

Middlesborough FAQ

Where is Middlesborough?+

Middlesborough is in Plymouth County, Massachusetts, at 41.85030, -70.89042. Nearest road: Walnut Street.

What rocks and minerals can you find at Middlesborough?+

Middlesborough is reported to produce Agate, Chalcedony.

Is collecting allowed at Middlesborough?+

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 Middlesborough?+

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 Middlesborough?+

The most comfortable months at Middlesborough are March to November.

How do I get to Middlesborough?+

Open the directions link to navigate to 41.85030, -70.89042 in Google Maps. The nearest road is Walnut Street.

More rockhounding in Massachusetts

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Open Middlesborough on the map

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