This year’s Mammoth-on will be
Sunday, September 29th, 2019.


About The Mammoth-on

Mammoth-on: America’s only cave, hike, and bike triathlon. This fun, family-friendly event grows larger every year! Challenge yourself or just have fun with friends and family as you Cave, Hike, and Bike one of the most unique Triathlons in the world.

Optional Activities:

  • Walk the Historic Tour route inside Mammoth Cave.

  • Hike two miles on a beautiful, woodland trail.

  • Ride a bike along the Mammoth Cave Railroad Bike and Hike Trail to Park City.

The Mammoth-on begins at the check-in tent in front of the Mammoth Cave Lodge. Enjoy a ranger-led hike into Mammoth Cave along the Historic Trail. Upon leaving the cave, participants will proceed to the nearby trail (marked with flags) to hike two miles. Lastly, participants ride a bike on the Mammoth Cave Railroad Bike and Hike Trail, which is about twenty miles round trip to the Grand Victorian Inn in Park City and back. Not quite ready to pedal twenty miles? Ride half as far as you feel works for you, and turn around. Want to ride further than twenty miles? Alternate mixed-surface route is available.

Friends of Mammoth Cave will provide rest stops and water stations along the way at Sloans Pond, Diamond Caverns and Bells Tavern Park. 

Please note, this is not a race, but a fun, family-friendly event. Helmets are recommended for the bike ride. Bikes and hiking gear not provided. Registration is free for participants under 12 years of age with a parent or guardian registration. T-shirt included with paid Adult Registrations only.

Event Details and Schedule

  • 7:30 am: Packet pick-up and on-site registration begins

  • 8:15 am: Safety briefing (required before entering Mammoth Cave)

  • 8:30 am: Ranger-led hike on the historic route inside Mammoth Cave

  • 9:00 am (approximate): Group exits the cave; hikers continue at their own on the 2.3-mile woodland trail.

  • 9:30 am (approximate): Hikers return to registration area, continue on their own bikes toward Park City (20 miles round-trip). 

  • 2:00 pm: Route sweepers close the course

Questions? Scroll down for FAQ.


Frequently Asked Questions

When is the last day to register online?

September 27th. Register early to be guaranteed a t-shirt.

Can I register at a table at the day of event or are we required to be pre-registered online?

Online registration is required for event planning (such as how much food is needed at rest stops) and Park restrictions.

Will everyone who registers get a t-shirt?

Shirts are provided to registered adults until we run out. T-shirt included with paid Adult Registrations only. No sizes are available for children this year, however, they may ask for one if we have extras.

What do the t-shirts look like?

This year they are a National Park Service Brown. As this event is park of the Trail Town Weekend, they feature the Cave Country Trails logo.

Will the cave portion be the same as a full tour?

The cave tour will be Ranger-led. Participants will see everything normally seen on the Historic Tour route, however, it will not include a verbally guided tour. The pace is faster than a typical tour, so is not recommended for smaller children.

Are children allowed?

Yes! This event is family-friendly. Registration is free for participants under 12 years of age with a parent or guardian registration. T-shirt included with paid Adult Registrations only. You can go your own pace and do as little as you want. However, the cave portion is not recommended for smaller children due to being paced faster than a typical tour.


Have a Question or Suggestion?

All questions are great questions. So are suggestions to make next year even more amazing. Let us know your thoughts!

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