Agate Fossil Beds National Monument

Hours
See this week's hours below.
- Entrance fee
- The Park Service lists no entrance fee for this site.
- Phone
- 3086654113
- Address
- 301 River Road, Harrison, NE 69346
About Agate Fossil Beds
In the early 1900s, paleontologists unearthed the Age of Mammals when they found full skeletons of extinct Miocene mammals in the hills of Nebraska -- species previously only known through fragments. At the same time, an age of friendship began between rancher James Cook and Chief Red Cloud of the Lakota. These two unprecedented events are preserved and protected here... at Agate Fossil Beds.
Hours
Trails
The park's two trails are open from dawn till dusk every day. Visitor Center features Miocene Mammal fossils, a 12 minute movie, and the James H. Cook Collection, a unique collection of American Indian artifacts that were gifts to James Cook and his family.
| Monday | Open 24 hours |
|---|---|
| Tuesday | Open 24 hours |
| Wednesday | Open 24 hours |
| Thursday | Open 24 hours |
| Friday | Open 24 hours |
| Saturday | Open 24 hours |
| Sunday | Open 24 hours |
Getting there
From US 20: 22 miles south of Harrison, NE on State Hwy 29, then three miles east on River Road (paved) From US 26: 34 miles north of Mitchell, NE on State Hwy 29, then three miles east on River Road (paved). From State Hwy 71: 25 miles west on the unpaved portion of River Road.
Weather
Summers can be very warm, high 90's to 100 with the frequent afternoon thunderstorms. Plan to hike early and come down from the higher points if storms threaten. Winter temperatures can dip as low as -20 with snow and wind. Heaviest snows can be expected in late Spring.
Things to do
Arts and Culture, Astronomy, Birdwatching, Bookstore and Park Store, Cultural Demonstrations, Food, Guided Tours, Hiking, Junior Ranger Program, Museum Exhibits, Park Film, Picnicking, Self-Guided Tours - Walking, Shopping, Stargazing, Wildlife Watching.
Source: National Park Service data feed, checked September 24, 2026. Hours shown are the Park Service's posted standard hours plus any date changes it lists. Official page for Agate Fossil Beds ↗