Jack Bristol Lake Waramaug Ultra Races

Event details

The Jack Bristol Lake Waramaug Ultra Races take place on April 26, 2026 in Kent, Connecticut at Lake Waramaug State Park. The event offers the following distances:

• 100K
• 50 Miler
• 50K

This edition marks the 52nd anniversary of the Lake Waramaug Ultras. The event is part of the Mount To Coast 100K Series. Registration closes on April 24, 2026. Overall male and female winners of each race receive certificates for a pair of R1 Mount to Coast shoes. Finishers in the 100K, 50 Mile and 50K receive a special medal and a finisher T-shirt from Mount to Coast. Completing three of the four races in the series earns an exclusive jacket. T-shirt sizes are not guaranteed after March 15.

Course, aid and race logistics

The course consists of rolling loops on paved roads around Lake Waramaug and is described as primarily flat. All runners begin near the intersection of Lake Waramaug Road and Anderson Acres Road. Runners complete a clockwise 2.2 mile out and then a counter-clockwise section at the start. Race-specific routing: the 50K includes three 7.6 mile laps followed by a 1.9 mile out-and-back to the State Park finish; the 50 Mile is six laps ending at the State Park; the 100K is seven laps followed by a 2.3 mile out-and-back to the State Park finish.

There are four stocked aid stations around the lake and post-race food and drinks. Distances between stations from the main start/finish are 1.8 miles, 1.9 miles, 1.7 miles and 2.2 miles. Time limits are 12 hours for the 50K and 13 hours for the 50 Mile and 100K; race officials may allow continued participation at their discretion based on conditions and safety. Visit the organization's website for the most recent information.