Quick Answer: Illinois state parks require an IDNR Metal Detecting Permit covering roughly 34 participating parks, hand tools only — no shovels, picks, or entrenching tools of any size — and beach detecting capped at sunrise to 10 a.m. Cook County Forest Preserves go further than any county in this series so far, banning even possession of a metal detector district-wide, with fines reported between $75 and $500 per violation. Unauthorized excavation on public land under 20 ILCS 3435 starts as a Class A misdemeanor and escalates to a Class 4 felony on repeat offenses.
Verified September 11, 2026: Confirmed the IDNR permit conditions, tool restrictions, and beach hours against the department’s own Metal Detecting Permit documentation and GetLuckyFind’s 2026 Illinois law guide, and cross-checked the Cook County Forest Preserve possession ban and fine range against TreasureNet’s detecting-community reporting on the district’s own ordinance.
Illinois is the 19th entry in this state-by-state series — Michigan, Ohio, North Carolina, Texas, Florida, Arizona, Colorado, Georgia, New York, Virginia, South Carolina, Tennessee, Kentucky, Oklahoma, Missouri, Indiana, Wisconsin, Alabama. The wrinkle here hasn’t shown up anywhere else in the series: one Illinois county doesn’t just restrict using a detector, it makes carrying one onto its land a finable offense on its own.
State parks: a real permit, hand tools only
The Illinois Department of Natural Resources requires a Metal Detecting Permit for IDNR-owned, -managed, or -leased sites, and roughly 34 state parks currently participate. The permit sets binding conditions: hand-carried devices plus small pen knives, ice picks, or reasonably-sized screwdrivers only — no shovels, picks, or entrenching tools of any size — you must return any disturbed ground to its original condition, and detecting is confined to whatever area the Site Superintendent designates that day. Detecting outside the permitted area can trigger criminal charges, not just a warning.
| Land type | Detecting allowed? | What's required |
|---|---|---|
| Illinois State Parks (~34 participating) | With permit | IDNR Metal Detecting Permit, hand tools only, Superintendent-designated area |
| State park designated beaches | With permit, limited hours | Sunrise–10 a.m. only |
| State Historical, Archaeological & Nature Preserve sites | No | Banned outright regardless of permit |
| Cook County Forest Preserves | No | District-wide ban — even possession is fineable |
| Private property | Yes, with permission | Landowner consent — no state permit needed |
Beaches add a second layer on top of the general permit: designated IDNR beaches only allow detecting sunrise to 10 a.m., a specific time-window restriction that hasn’t appeared anywhere else in this series. Any item of antiquity relevant to the park has to be turned in to the park office rather than pocketed, and detecting is banned outright on any State Historical, Archaeological, or Nature Preserve site — no permit overrides that carve-out.
Cook County: the only place in this series where possession alone is illegal
Every prior state in this series has drawn the line at using a metal detector without permission. Cook County’s Forest Preserve District draws it a step earlier: its ordinance prohibits metal detecting district-wide, and detecting-community reporting on the ordinance describes fines running $75 to $500 per violation for possessing a detector on Forest Preserve land at all — not just for digging with one. The prohibition also extends to excavating, removing, altering, or defacing Forest Preserve property in connection with detecting. Practically, that means the safest move in Cook County is leaving the detector in the car anywhere inside Forest Preserve District boundaries, not just turning it off.
Garrett ACE 250
- Fixed 7.2 kHz frequency and a 6.5"x9" concentric coil keep it simple for a first permitted hunt on hand-tools-only ground — no shovel needed to work a designated area.
- At 2.7 lb it's the lightest detector in Garrett's ACE line, useful for the sunrise-to-10-a.m. beach window where speed of setup matters.
- See our full Garrett ACE 250 review and the beginner buying guide for how it compares to the newer ACE 300.
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Archaeological sites and human remains: a felony-track law
Illinois protects public-land archaeology through 20 ILCS 3435, the Archaeological and Paleontological Resources Protection Act, which reserves excavation rights on public land to the state. A first offense is a Class A misdemeanor; repeat violations escalate to a Class 4 felony — a sharper penalty curve than the flat misdemeanor charge seen in most other states in this series. A separate statute, 20 ILCS 3440, the Human Remains Protection Act, independently protects unregistered graves, mounds, and markers over 100 years old, regardless of who owns the land they sit on. Neither law requires the site to be formally marked or fenced — the protection applies whether or not a detectorist knew what they were standing on.
Federal land: the same baseline as every state in this series
Federal ground in Illinois follows the same floor that applies nationwide: the Antiquities Act of 1906 and the Archaeological Resources Protection Act (ARPA) make it illegal to remove a man-made object more than 100 years old from federal public land without a research permit. National forests generally allow recreational detecting outside archaeological sites, while national parks and monuments ban detectors outright under 36 CFR 2.1(a)(7) — see our metal detecting legality guide for the full federal breakdown.
Getting started
Illinois’ realistic starting point is a state park that participates in the IDNR permit program — apply ahead of time, confirm which area the Site Superintendent has designated, and leave the shovel at home since hand tools are the hard limit. If you’re anywhere near Chicago, treat Cook County Forest Preserve boundaries as a hard no rather than a gray area, given the possession-level ban. Private land with permission remains the broadest option statewide either way. Pair a beach hunt with a sand scoop and check our beginner buying guide before your first outing.
The bottom line
Illinois runs a real permit system on state park land — hand tools only, roughly 34 parks, a sunrise-to-10-a.m. beach window — but the detail that sets it apart from the rest of this series is Cook County’s forest preserve ordinance, which bans even carrying a detector, not just using one. Layer on a felony-track excavation law under 20 ILCS 3435 and a separate human-remains protection statute, and Illinois rewards knowing exactly whose land you’re standing on before the machine ever comes out of the car. See the complete field in our overall pillar rankings or the metal detecting legality guide for how other states compare.
Sources: Illinois DNR — Metal Detecting Permit, GetLuckyFind — Metal Detecting Laws in Illinois (2026), The Metal Detecting Guy — Metal Detecting in Illinois, TreasureNet — Cook County Illinois Banned Metal Detecting in all Forest Preserves.