Miocene Epic Endurance Challenge

MAR
22
2026
Test your limits on a scenic 5 mile loop along the Chesapeake Bay at Calvert Cliffs with a 6 hour in person or virtual endurance challenge. Run as many loops as you can for a 50k trilobite medal, great aid stations and premium swag.
Sun 22 Mar 2026
Per Loop Distance 50k Finisher Milestone 6 Hour Run (in-Person)

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Event

The Miocene Epic Endurance Challenge is a trail endurance event held at Calvert Cliffs State Park in Lusby, Maryland. The course is a roughly 5-mile loop along the shores of the Chesapeake Bay. The event offers two formats:

  • 6-hour in-person endurance run
  • Virtual 6-hour option with the same swag shipped to participants

Runners may complete as many loops as they wish within the 6-hour time frame. Runners who cover 50k or more receive a Miocene trilobite medal. Podium awards are given to the top three men and top three women in the 6-hour open category, plus age group awards.

Logistics and services

Each runner receives a Miocene Epic premium item and a swag bag. Aid stations are fully stocked on every loop with sweets, salty snacks, drinks, and fresh breakfast foods such as pancakes, fried potatoes, bacon, and fruit. A hot meal is provided at lunch/finish; past examples include wood-fired pizza, roasted elote, chili, and fries. The course is well marked and volunteers are present. Participants may set up personal tents, chairs, coolers, or aid stations between loops.

Parking is available within Calvert Cliffs State Park; park entry fees are $5 for Maryland residents and $7 for non-Maryland residents. Registration closes on Thu, Mar 19 at 11:59 PM ET. If the in-person event is canceled, entrants will be moved to the virtual event and no refunds will be given. Ordinary cancellations 30 days or more before the event receive the entry fee minus $30; cancellations less than 30 days receive no refund. Visit the organization's website for the most recent information.

6 hr
6 Hour Run (in-Person)
50 km
50k Finisher Milestone
5 mi
Per Loop Distance