Rockhounding in Arizona, ground by ground

In Arizona, the ground you can rockhound on is almost all federal: Bureau of Land Management (BLM) land, where hobby collecting is allowed, and national forest. The trap is the checkerboard of Arizona State Trust Land in between. BLM Arizona tells collectors that rockhounding and metal detecting "are not allowed" on trust land, and the State Land Department sells a recreational permit that says nothing about rocks. This page shows who manages what in Arizona, the BLM Arizona office's own 25 pound guideline and where it comes from, the collecting areas BLM names, and whom to call before you dig.

How Arizona's land divides

Federal agencies manage 38.5 percent of Arizona, about 28 million acres, according to the Congressional Research Service's 2026 count (data as of September 30, 2024) [1]. Two agencies hold nearly all of it.

Acreage from CRS R42346, Table 2 [1]. The report counts only five federal agencies, so state trust land, tribal land and private land make up the rest of the state.

BLM land, and the Arizona office's 25 pound guideline

The national BLM rule lets you collect "reasonable amounts" of "rocks, mineral specimens, and semiprecious gemstones" for noncommercial purposes, except on developed recreation sites or where collecting is prohibited and posted, and it bars "explosive, motorized or mechanical devices, except metal detectors" [2]. The regulation sets no pound figure; the full rule is on collecting on BLM land.

BLM's Arizona state office goes further in its own brochure, Rockhounding in Arizona (BLM/AZ/GI-14/009). It sets personal-use limits of "up to 25 pounds per day, with a total limit of 250 pounds per year," and applies them to specimens, fossils, gemstones, rock and petrified wood [3]. It adds that a group may not pool allotments "to collect a piece larger than 250 pounds," and that you should ask BLM about a permit "If you wish to obtain more than 250 pounds of rock in a year" [3].

Read that number for what it is: a guideline from one state office, applied in Arizona. It is not the national rule for rocks. The brochure carries no printed date; its file name suggests a 2014 edition posted in 2018, and the BLM's national rockhounding page still links to it as the Arizona guide in October 2026 [3][4]. Because the guideline is BLM Arizona's, follow it on BLM land in Arizona, and ask the field office if you plan to come near it. Petrified wood has its own national limit, which happens to use the same figures; its rules and the no-sale condition are on petrified wood on public land.

The same brochure also covers meteorites, under a 2012 BLM policy whose status is uncertain. Read meteorites on public land before you keep one.

State Trust Land is not public land

About the trust land, two state documents and one federal one have to be read together.

• What BLM Arizona says. "Please remember that Arizona State Trust Land is not public land." "You must obtain the Arizona State Land Department's Recreational Use Permit to camp hike or travel on State land." "Rockhounding and metal detecting are not allowed on Arizona State Trust Land." [3]
• What the State Land Department says. Its FAQ agrees that trust lands "are different than 'public lands'" because they are managed for the trust's beneficiaries [5]. Recreational users generally need a permit: $15 for an individual and $20 for a family, each good for a year, with an exception for licensed hunters and anglers actively pursuing game or fish in season [5]. The permit's published terms limit camping to 14 days a year and travel to existing roads and trails [6].
• What the department does not say. Neither the FAQ nor the permit terms, read in October 2026, mention rockhounding, rock collecting, metal detecting or prospecting [5][6].

So the only published statement on rockhounding is BLM's, and it says no. The recreational permit gets you onto trust land legally; nothing the department publishes says it lets you take rocks. Treat trust land as closed to collecting unless the State Land Department tells you otherwise in writing. The administrative rules for the department (Arizona Administrative Code Title 12, Chapter 5) include sections on trespass and recreational closures; their text on collecting was not confirmed for this page [7].

Trust land parcels sit inside BLM and forest land, often as whole square-mile sections. A rock field that looks continuous can cross a trust land boundary with no fence. Check before you collect, using the steps on finding out who manages a parcel.

Where BLM Arizona points collectors

The brochure lists what each field office's ground is known for [3]. These are BLM's descriptions, not site directions, and the field office can tell you which parcels are open and unclaimed.

BLM's national rockhounding page also links two Arizona areas set aside for collectors: the Black Hills Rockhound Area and the Round Mountain Rockhound Area [4]. Read each area's own BLM page before you go; a designated area can carry rules narrower than the general regulation.

Monuments, parks and Petrified Forest

BLM Arizona's brochure states: "Collecting in BLM national monuments is prohibited" [3]. In Arizona, follow the brochure and ask the monument office; how monuments managed by different agencies differ is explained on the national parks page linked below. National Park Service units, including Petrified Forest National Park, allow essentially no collecting; the regulation and its few exceptions are on national parks and monuments. Petrified wood on BLM land outside the park follows the BLM rule.

Arizona State Parks rules on rocks were not confirmed for this page. Assume a state park bans collecting unless the park tells you it allows it.

Tools, detectors and claims

On BLM land in Arizona, hand tools are the norm. The brochure says collecting may not be "aided with motorized or mechanical devices, including heavy equipment or explosives," and "Metal detectors are acceptable, with the exception of the San Pedro Riparian National Conservation Area" [3]. Which tools count as hand tools is covered on which tools you may use.

Arizona has many active mining claims, and the brochure warns that "Mining claimants may have the right to exclude others from using their mining claims" [3]. Check claims before you collect; the method is on mining claims. The brochure also gives the Arizona State Mine Inspector's number, (602) 542-5971, for reporting abandoned mine hazards [3]; stay out of old workings, for the reasons on old mines, tailings and dumps.

Reservation land and private digs

Reservation land in Arizona is governed by each tribe, not by BLM or the state, and none of the sources on this page grants any collecting right there. Ask the tribe's own office before you stop, let alone dig.

If you want to keep or sell what you find without any of these questions, a fee-dig site or a private landowner's written permission is the cleaner path. How those work is on fee-dig sites and collecting on private land.

Confirm with the Arizona offices

Last verified October 2026. Before a trip, confirm with:

• BLM Arizona State Office, (602) 417-9200, and the field office for your area, using Rockhounding in Arizona (BLM/AZ/GI-14/009): ask whether the 25 and 250 pound guideline is current and whether your site is open and unclaimed [3].
• Arizona State Land Department, FAQs and Recreational Permits Terms and Conditions pages: ask in writing whether rock collecting or metal detecting is allowed on any trust land parcel [5][6].
• Arizona Geological Survey, 520-770-3500, the state survey BLM names for geology questions [3].

Your next practical question is usually whether a specific spot is BLM, trust land or private. Work it out on finding out who manages a parcel.

References

1. Congressional Research Service, *Federal Land Ownership: Overview and Data*, R42346, updated September 14, 2026 (data as of September 30, 2024), Table 2. https://www.everycrsreport.com/files/2026-09-14_R42346_c4220347ac982efb0aebb44f2a7db48e961ec900.pdf
2. 43 CFR 8365.1-5, Property and resources (Cornell LII, read October 2026; last amended 87 FR 47329, Aug. 2, 2022). https://www.law.cornell.edu/cfr/text/43/8365.1-5
3. Bureau of Land Management, Arizona, *Rockhounding in Arizona*, BLM/AZ/GI-14/009 (no printed date; web file dated 2018). https://BLM.GOV/sites/default/files/documents/files/2014%20Rockhounding_14_web_2018.pdf
4. Bureau of Land Management, *Rockhounding*, read October 2026. https://blm.gov/programs/recreation/rockhounding
5. Arizona State Land Department, *FAQs*, read October 2026. https://land.az.gov/faqs
6. Arizona State Land Department, *Recreational Permits Terms and Conditions*, read October 2026. https://land.az.gov/recreational-permits-terms-and-conditions
7. Arizona Administrative Code, Title 12, Chapter 5, State Land Department, Supp. 24-2 (June 30, 2024), table of contents (R12-5-533, R12-5-534). https://apps.azsos.gov/public_services/Title_12/12-05.pdf