Hagerman Fossil Beds National Monument

Hagerman Fossil Beds National Monument is a Pliocene-age site near Hagerman, Idaho. The 4,351-acre (17.61 km2) Monument is internationally significant because it protects one of the richest known fossil deposits from the Blancan North American Land Mammal Age. These fossils date from 3.07 million to at least 4 million years ago in age and represent at least 200 species.

Hagerman is best known for having the largest known concentration of the fossil Hagerman horse, Equus simplicidens. The fossil beds, including the historic Smithsonian Horse Quarry, were designated a National Natural Landmark in 1975 and was reclassified as a National Monument in 1988. In 2014, Hagerman Fossil Beds National Monument joined Sibiloi National Park in Kenya as "sister parks" through a memorandum of understanding between the National Park Service and Office of International Affairs, the National Museums of Kenya, and Kenya Wildlife Service.

A fundraising campaign at Hagerman helped send three Kenyan students to the internationally recognized Koobi Fora Field School, managed by George Washington University. Students from all over the world attend to learn East African archaeology, geology, and primatology taught by experts in their respective fields.

Hagerman Fossil Beds National Monument occupies a particular place in the imagination of American public lands. As a National Monument in Idaho and Washington, it represents a deliberate choice — by the people who advocated for its protection, and by the National Park Service rangers who maintain it — to keep this landscape available to anyone willing to make the trip. That accessibility is the quiet miracle of the park system.

The pages linked below break the visit down into the four practical questions every traveler asks: where can I hike, where can I sleep, what else is worth seeing while I'm in the area, and what should I know before I show up. Each one is written from the perspective of someone planning their first trip — assume nothing, explain what's worth explaining, and skip the marketing language. If you've been here before, treat these guides as a refresher and a way to discover the corners you missed last time.

What this guide covers

Over the next four pages, this field guide breaks Hagerman Fossil Beds National Monument into the practical questions every traveler asks: which trails are worth the effort, where to sleep both inside and outside the park boundary, what else is worth a stop in the surrounding region, and the small-but-essential tips that make the difference between a stressful first day and a smooth one. Use the navigation above to jump between sections, or read them in order — they're written to flow.

• Hikes — short loops, half-day trails, and backcountry routes
• Camping — drive-in campgrounds, RV sites, and backcountry permits
• Nearby attractions — gateway towns and adjacent public lands
• Visitor tips — timing, fees, weather, and what to skip

Logistics at a glance

Use this quick reference when you're putting together your itinerary. The figures below are the most-asked questions every visitor needs answered before arrival, summarized in one place.

Designation	National Monument
States	Idaho, Washington
Entrance fee	Typically free or under $10 per person. Confirm at park entrance.
Visitor center hours	Most open daily 8–9am to 4:30–6pm. Reduced winter hours common.
Best months	Plan around the weather notes above.
Camping inside park	See the camping guide for campground details, fees, and reservation windows.
Nearby gateway towns	See nearby attractions for lodging and supply stops.