New Hampshire Metal Detecting Laws — Research Overview

An orientation to metal detecting and treasure hunting rules in New Hampshire, covering federal land, state land, private property, and who to verify with. This page is general research information, not legal advice. The state-level summaries below are our own category-level orientation and are not sourced to a New Hampshire statute, code section, or agency ruling. Rules change and differ by unit — verify with New Hampshire State Parks before detecting.

Public and federal land in New Hampshire [UNSOURCED SUMMARY — confirm with the managing federal unit]: White Mountain NF permits detecting outside protected historic sites. Federal land is also governed nationally by the Archaeological Resources Protection Act (ARPA) and the Antiquities Act, which prohibit disturbing archaeological resources over 100 years old without a permit.

State land in New Hampshire [UNSOURCED SUMMARY — confirm with New Hampshire State Parks]: New Hampshire state parks require permits.

Permits, permissions, and best practices in New Hampshire [UNSOURCED SUMMARY]: Ask town clerks about local recreation areas. Always carry written landowner consent for private ground and photograph the permission document.

Terrain and productive regions in New Hampshire: Glaciated mountain forest and lake basins. Top areas to research include White Mountains, Connecticut River valley, Seacoast (Portsmouth).

Documented cases relevant to legal research in New Hampshire: Indian raid caches; Revolutionary paymaster losses; Resort hotel caches — legal status of any recovered items depends on land ownership at the moment of discovery.

Federal rules that apply in New Hampshire regardless of state law: ARPA (16 U.S.C. 470aa-470mm) protects archaeological resources 100 years or older on federal and Native American land; NAGPRA (25 U.S.C. ch. 32) governs Native American remains and cultural items; and the National Park Service prohibits metal detector use in park areas under 36 C.F.R. 2.1. Treasure trove and lost-property doctrine are set by state law and are not summarized here.

Verify with the governing agency in New Hampshire: New Hampshire State Parks (https://www.nhstateparks.org/). Archaeological designations and permitting: the New Hampshire State Historic Preservation Office, listed in the NCSHPO directory at https://ncshpo.org/. Federal land: Bureau of Land Management, National Park Service, and USDA Forest Service.