Idaho · BLM
Idaho BLM rockhounding rules
Most free, permit-less Idaho rockhounding happens on BLM land. The BLM manages nearly 12 million acres here, from the Owyhee canyonlands to the Snake River Plain and the Salmon country, and BLM Idaho counts more than 280 mineral species in the state. Collect by hand, for yourself, a reasonable amount. The traps are claims, mixed ownership and overlays.
The rule
- The national baseline: “except on developed recreation sites and areas, or where otherwise prohibited and posted,” you may collect reasonable amounts of “rocks, mineral specimens, and semiprecious gemstones” for noncommercial purposes (43 CFR 8365.1-5(b)). No “explosive, motorized or mechanical devices, except metal detectors” (8365.1-5(a)(3)). Anything for sale or barter to commercial dealers needs a contract or permit (8365.1-5(c)).
- How BLM Idaho describes it: its Minerals page treats rockhounding as casual use that can be done “without a permit or fee” when you use only hand tools or metal detectors, cause no more than minor disturbance, collect for personal use and not for sale or trade, and stay to reasonable amounts. Restore the area when you are done.
- Petrified wood: “up to 25 pounds plus one piece per day, and no more than 250 pounds per year” (BLM Idaho; 43 CFR 3622.4). No pooling. A permit is needed above these limits.
- Common invertebrate and plant fossils: 25 lb per person per day, surface or non-powered hand tools, negligible disturbance, no sale (43 CFR 49.810). Vertebrate fossils need a permit.
- Artifacts: BLM Idaho treats objects more than 100 years old that were used or made by people as cultural artifacts. Leave them in place.
Where you can't collect on Idaho BLM
- Active mining claims without permission. BLM's “Can I Keep This?” page says collecting on claims “is prohibited without the claimholder's permission.” BLM counts more than 40,000 active claims in Idaho. Check MLRS.
- Developed recreation sites, excluded by 43 CFR 8365.1-5(b).
- Wilderness and WSAs: BLM's “Can I Keep This?” page limits these to hand tools and minimal disturbance. Ask the field office before collecting.
- Private and state sections inside BLM country, often unfenced. Idaho lets owners post land with signs or orange paint (Idaho Code 18-7008).
- The BLM part of Craters of the Moon. No official BLM statement on rock collecting there was found. Call the Shoshone Field Office (208-732-7200) and treat it as no until told otherwise. Verify.
Decorative stone and dredging
BLM Idaho's 2009 rockhounding brochure says river cobbles and lava rock for landscaping or construction need a permit from the field office, and it says Idaho “has no specially designated BLM collecting sites.” It also says small portable suction dredges may be casual use on BLM land but need a state recreational dredge permit from the Idaho Department of Water Resources and an EPA general permit, and that some streams are closed. The brochure is old, and several of its phone numbers no longer match BLM's office pages. Verify current permits and closures with the field office, IDWR and EPA.
Who to call
Idaho State Office 208-373-3889 · Boise District (Bruneau, Four Rivers) 208-384-3300 · Owyhee 208-896-5912 · Twin Falls District (Jarbidge) 208-735-2060 · Burley 208-677-6600 · Shoshone 208-732-7200 · Idaho Falls District (Upper Snake) 208-524-7500 · Pocatello 208-478-6340 · Challis 208-756-5499 · Salmon 208-756-5400 · Coeur d'Alene District 208-769-5000 · Cottonwood 208-962-3245. Numbers are from blm.gov office pages; confirm before you call. Give the township, range and section when you ask.
Compare: Oregon BLM rules · Nevada BLM rules · Arizona BLM rules · Utah BLM limits.
Sources: BLM Idaho, Minerals; BLM Idaho, What We Manage; 43 CFR 8365.1-5; 43 CFR 3622; 43 CFR 49; BLM, Can I Keep This?; BLM Idaho, Recreational Rockhounding brochure (2009); BLM, Craters of the Moon; Idaho Code 18-7008; BLM office pages.
Informational only — not legal advice. Rules, boundaries and seasons change. Confirm with the managing agency for the exact parcel before you collect. Last verified November 2, 2026.