Save the Date! The 2026 race will be held on Saturday, May 2. Registration is currently full with a waitlist.
The summit access road and summit parking will be closed to oncoming traffic during the race. Base parking and trails will remain open. Please plan your visit accordingly.
COURSE MARKING is now in place. Please do not disturb.
Volunteers Needed: Sign up for a slot here
Runner’s Potluck Aid Station: Sign up here
The Big A 50K course is composed of three 10.35 mile loops starting at the summit of Mount Agamenticus (Big A) and climbing back up the Big A and going over Second Hill and Third Hill and back up the Big A. There are opportunities to cross the finish line at approximately 10 miles and 13 miles (or any multiple of them up to 31 miles/50K).
The terrain is mostly single track with some dirt road and ATV-type trails. The full 50K has 5,787 feet of elevation gain. Footing is technical with plenty of rocks, roots, and elevation changes. Trail running shoes are recommended. All runners should train for and plan to finish within 10 hours.
Course Records
Patrick Caron 4:48 (2017)
Lila Gaudrault 5:22 (2022)
➤ 2024 Course Map
➤ Course Map GPX File
➤ 2024 Course Turn Sheet
➤ 2024 Results
➤ 2024 Race Photos by Allyn Genest
➤ FAQ’s
➤ Past Results
➤ Past Pre-Race Group Photos
➤ Accommodations
➤ Directions to Start
Please direct questions to Nick Darby at York Parks and Recreation.
Page last updated April 29, 2026.