Lace up for a journey through history and stunning New England scenery at the Jack Bristol Lake Waramaug Ultra Races in Kent, CT, on April 26, 2026. This iconic event, celebrating its 52nd anniversary, holds the distinction of being the oldest 100K in the United States, drawing ultrarunners to its hallowed, paved loops around picturesque Lake Waramaug. Whether you're aiming for a personal best in the 50K or 50M, or tackling the historic 100K distance, this race is renowned as a "PR course" thanks to its rolling yet predominantly flat terrain. While generally considered forgiving, runners can expect some gentle, rolling inclines that add a subtle challenge to the otherwise fast course.

The race begins near the intersection of Lake Waramaug Road and Anderson Acres Road, guiding all participants through an initial out-and-back section before embarking on multiple 7.6-mile loops around the lake, culminating in a finish at the State Park. Throughout your effort, you'll be supported by four well-stocked aid stations strategically placed around the lake, ensuring you're never far from essential hydration and nourishment. Typical race day conditions in late April offer pleasant highs around 65°F and lows around 40°F, with a relatively low 17% chance of precipitation, creating ideal running weather.

Beyond the scenic vistas and the chance for a strong performance, the Jack Bristol Lake Waramaug Ultra Races offer a truly special atmosphere, celebrated for its excellent organization and dedicated volunteers. Finisher swag includes a high-tech T-shirt and a special Mount to Coast finisher medal, with 100K finishers also earning a custom belt buckle. This event isn't just a race; it's a vibrant tradition in the ultrarunning community, offering a memorable experience on a course that has witnessed decades of ultra-endurance achievements.