Tough Mountain X - July 27, 2019

2019 marks the 10th year of Tough Mountain Challenge, and registration is open! Sign up now for the best availability of heat times.

See the registration page for details.

Why Tough Mountain Challenge?

If you want to run 10 miles in the company of 10,000 other people and wait in half-hour lines at obstacles, you'll find plenty of events where you can do just that. If you want to suffer for hours and risk life and limb, you can find those races too. But if you're looking for something different – something as fun as it is tough without the ego and the crowds – welcome to the Tough Mountain Challenge.

The Race

Based at Sunday River Ski Resort in western Maine, the Tough Mountain Challenge is an adventure obstacle race that tackles alpine terrain and throws in natural and man-made challenges. It's just 5k in length, but when you're running up a mountain under an arsenal of snowguns or scrambling through the mud it will feel much longer. Tough Mountain Challenge is a timed event, but it's not about whether you finish first or last - it's about testing yourself and pushing your limits then celebrating your accomplishment once you cross the finish line.

Tough Mountain Challenge is limited to fixed number competitors in each heat to keep the race from feeling too crowded and ensure everyone has a great time. For kids, we also run a Mini Mountain Challenge.

Our FAQ page page is loaded with more details and you can find all kinds of fun content on Facebook.

The Venue

Tough Mountain Challenge is based at South Ridge Lodge at Sunday River, and spectators can access many of the most popular obstacles on foot. The lodge is open all day with seating, bathrooms, food, bag storage and other amenities. Parking is plentiful, and free.

In addition to the event you'll find a wide range of activities including chairlift rides, ziplines, hiking, and more. If you'd like to make it a full weekend you'll also find hotels, a spa, golf, and more.

Friday Night Party

Tough Mountain Challenge officially kicks off on Friday night with Early Check-in from 5 to 9 PM and TMC Pre-Party from 6 to 9:30 PM complete with live music, food, fireworks, and more. Both Early Check-In anad the Pre-Party are located at South Ridge Lodge, right at the event venue. Don't miss it!


Sunday River offers two full-service hotels complete pools, restaurants, and health clubs, as well a comfortable and budget-friendly inn -- all located right at the resort and just minutes from the event venue. Book lodging online or call 800-543-2754.

Some Pointers


If you have questions about the format of the event or other competitor-related items please email us. Most other questions can be answered on the FAQ page.


We welcome volunteers interested in helping with the event. Volunteer shifts range from four to eight hours, and all volunteers will receive a t-shirt and lunch. Please email us if you are interested in helping or would like to learn more.

Sponsorship Opportunities

A variety of options are available for sponsorship and corporate presence at the event. Please contact us for more information.