Mount Jasper: Jasper Rockhounding in Coös County, New Hampshire

Updated June 2026

Mount Jasper is a mapped rockhounding spot in Coös County, New Hampshire. Reported finds include jasper. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Coös County
State: New Hampshire
Nearest road: Willard Street
Postcode: 03570
Coordinates: 44.48518, -71.19336

Geology at Mount Jasper

This spot sits on Ammonoosuc Volcanics, Bimodal volcanic rocks, mapped as felsic volcanic and mafic volcanic that formed roughly 470 to 445 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit: Ammonoosuc Volcanics, Bimodal volcanic rocks
Age: 470–445 Ma (Middle Ordovician to Late Ordovician)
Rock types: felsic volcanic and mafic volcanic
Elevation: 1,320 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 Mount Jasper

Best months: April to October. Typical highs run 77°F in midsummer and 25°F in midwinter, with winter lows near 4°F.

Climate normals: NOAA 1991-2020 monthlies, BERLIN station (2 mi away), adjusted for elevation.

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 Mount Jasper

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 Mount Jasper.

Across the state line from Mount Jasper

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

Mount Jasper FAQ

Where is Mount Jasper?+

Mount Jasper is in Coös County, New Hampshire, at 44.48518, -71.19336. Nearest road: Willard Street.

What rocks and minerals can you find at Mount Jasper?+

Mount Jasper is reported to produce Jasper.

Is collecting allowed at Mount Jasper?+

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 Mount Jasper?+

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 Mount Jasper?+

The most comfortable months at Mount Jasper are April to October.

How do I get to Mount Jasper?+

Open the directions link to navigate to 44.48518, -71.19336 in Google Maps. The nearest road is Willard Street.

More rockhounding in New Hampshire

See all 38 New Hampshire spots →

Open Mount Jasper on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.