Where to Find Horn Coral in Michigan

Michigan has 18 mapped collecting spots that report horn coral, spread across 12 counties. The largest share sits in Leelanau County with 3 spots. 15 of the spots are on land mapped as publicly accessible, and 2 are fee-dig sites.

Spot list checked against source data on April 1, 2026.

Standout horn coral spots in Michigan

Hand-picked from the full list below, with the reason each one earns a trip.

Rockport Recreation Area
Alpena County
Rockport State Recreation Area opens a 300-acre former limestone quarry whose floor is scattered with Devonian fossils about 400 million years old, including Petoskey stones, Favosites honeycomb coral, brachiopods, and crinoids.

Best counties for horn coral in Michigan

Ranked by the number of mapped horn coral spots. County links open the full rockhounding page for that county.

Every horn coral spot we track in Michigan

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
Harrisville State Park	Alcona County	Granite Chert Quartz Chain Coral Horn Coral Petoskey Stone Puddingstone Yooperlite	44.6475, -83.2976	Paid / fee
Pier Cove Park	Allegan County	Lightning Stone Quartz Unakite Horn Coral Chert Yooperlite Crinoid Slag	42.5859, -86.2267	Public
Partridge Point	Alpena County	Crinoid Brachiopod Horn Coral Blastoid	45.0078, -83.4322	Public
Rockport Recreation AreaOld Grade Road	Alpena County	Petoskey Stones Fossilized Coral Brachiopods Crinoid Stems Pyrite Petoskey Stone Brachiopod Horn Coral +7 more	45.2013, -83.3949	Public
Antrim Creek Natural Area	Antrim County	Petoskey Stone Charlevoix Stone Horn Coral Fossils Chain Coral Beach Glass	45.1791, -85.3787	Public
Singing Bridge Public Access	Arenac County	Petoskey Stone Charlevoix Stone Gneiss Granite Puddingstone Horn Coral Fossils Jasper +9 more	44.1432, -83.5686	Public
Frankfort Public Beach And Playground	Benzie County	Granite Chert Quartz Chain Coral Horn Coral Frankfort Green Petoskey Stone Unakite	44.6324, -86.2458	Check locally
Point Betsie Lighthouse	Benzie County	Petoskey Stone Chert Chain Coral Granite Unakite Crinoid Brachiopod Horn Coral +5 more	44.6913, -86.2553	Public
Rocky Gap Park	Berrien County	Petoskey Stone Unakite Quartz Crinoid Lightning Stone Charlevoix Stone Horn Coral Chain Coral +4 more	42.1344, -86.4660	Public
Bayfront Park (West)	Emmet County	Petoskey Stone Charlevoix Stone Horn Coral Brachiopod Slag	45.3763, -84.9647	Public
Magnus Park	Emmet County	Petoskey Stone Charlevoix Stone Brachiopod Horn Coral Slag	45.3727, -84.9752	Public
Hidden Beach	Leelanau County	Leland Blue Petoskey Stone Unakite Quartz Granite Jasper Chert Charlevoix Stone +7 more	45.0196, -85.7645	Public
North Beach	Leelanau County	Petoskey Stone Unakite Stromatoporoid Charlevoix Stone Horn Coral Stromatolite Granite Quartz +6 more	45.0260, -85.7596	Public
Van's Beach	Leelanau County	Leland Blue Petoskey Stone Unakite Quartz Granite Jasper Chert Charlevoix Stone +7 more	45.0223, -85.7625	Public
Hoeft State Park	Presque Isle County	Puddingstone Granite Quartz Chert Horn Coral Brachiopod Crinoid	45.4637, -83.8836	Paid / fee
Lake Huron Roadside Park	Sanilac County	Puddingstone Gowganda Tillite Stinkstone Quartz Charlevoix Stone Horn Coral Brachiopod Petoskey Stone	43.4042, -82.5392	Public
Deerlick Creek Park	Van Buren County	Fossils Lightning Stone Unakite Petoskey Stone Jasper Beach Glass Horn Coral Cold Water Agate +4 more	42.3725, -86.2923	Public
Pilgrim Haven Natural Area	Van Buren County	Lightning Stone Quartz Unakite Horn Coral Crinoid Chert Petoskey Stone Cold Water Agate +2 more	42.3527, -86.2987	Public

Before you go

Read the horn coral identification guide so you know what a keeper looks like in the field: Horn Coral in the encyclopedia.

Horn Coral in Michigan FAQ

Where can you find horn coral in Michigan?+

The mapped spots concentrate in Leelanau County, Alpena County, and Benzie County. Every spot on this page appears on the map above with coordinates and access notes.

How many horn coral spots are mapped in Michigan?+

18 spots across 12 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.

Is it legal to collect horn coral in Michigan?+

Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 15 of the 18 mapped spots here sit on land marked public, and 2 are fee-dig operations where you pay for access and keep what you find. Always confirm current rules with the managing agency before you dig.

More minerals to hunt in Michigan

Hunt horn coral in Michigan with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.