The Blue 2 Blue Challenge

West Rock, United States • 4 May 2025

The Blue 2 Blue Challenge is a demanding 50K trail race set in New Haven, Connecticut, known for its challenging terrain and technical trails. Participants will navigate some of the toughest trails in the state, including the Regicides and Quinnipiac Trails, with a total elevation gain of approximately 6,350 feet. The race features an out-and-back course with multiple aid stations, and runners must have completed a trail 50K within the past year to qualify. With a strict 10-hour cutoff and no pacers or crews allowed, this event is designed for experienced runners seeking a true challenge. Visit the organization's website for the most recent information.

Race information

50 km
6350 m+
50k
Visit the organization's website for the most recent information.
Trail runs nearby

The 7th Annual Taco Trials is a unique running event held in North Haven, CT, where participants eat tacos while completing a one-mile loop. Competitors must run ten loops, consuming at least one taco to qualify for a medal. The event is known for its humorous and lighthearted atmosphere, with a rep..

The West Rock Winter Fat Ass Extravaganza is an exciting running event taking place in Hamden, CT, featuring 1.6-mile loops around Lake Wintergreen for a duration of eight hours. Participants can enjoy a variety of refreshments, including pizza, soup, grilled cheese, and snacks, while an aid station..

The Sleeping Giant Trail Runs is an exciting and challenging trail running event set in Hamden, Connecticut, featuring two race distances: a 25K and a 50K. The course showcases the diverse terrain of Sleeping Giant State Park, with over 30 miles of trails that include smooth carriage roads and techn..

The Forgotten Forest Ultra Run, taking place in Stratford, CT, is a unique 9-hour trail running event set in the scenic Roosevelt Forest. Participants can choose to run, jog, hike, or walk on a well-marked loop trail featuring an elevation gain of approximately 131 feet per loop. This friendly compe..

The Ansonia Trails 5K is a running event taking place in Ansonia, CT, designed for participants of the 169 Society. This second annual race features a unique course consisting of two laps around a 1.55-mile loop, making it slightly over or under a traditional 5K distance. Limited to 50 runners, the ..

The Ansonia Six Hour Trail Run is an exciting endurance event taking place at the Ansonia Nature Center in Ansonia, Connecticut. Participants will tackle approximately 1.9-mile loops on moderately technical singletrack trails, featuring about 170 feet of elevation gain per loop. Scheduled for the se..