Cumberland Hill: Agate & Chalcedony Rockhounding in Providence County, Rhode Island

Plan your visit

Generally open to casual rockhounding

County

Providence County

State

Rhode Island

Nearest road

Woonsocket Industrial Highway

Postcode

02838

Coordinates

41.98034, -71.48560

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit Cumberland Hill

Comfortable months (45 to 90°F highs)

Best months: March to November. Typical highs run 85°F in midsummer and 39°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, WOONSOCKET station (1 mi away), adjusted for elevation.

Geology at Cumberland Hill

This spot sits on Esmond Igneous Suite - granite, mapped as granite that formed roughly 635 to 540 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit

Esmond Igneous Suite - granite

Age

635–540 Ma (Neoproterozoic)

Rock types

granite

Elevation

140 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.

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.

• Rhode Island Geological Survey
• Rhode Island DEM park rules
• Community submissions reviewed against published agency rules