Springing to life in October 2025, the Caveman Challenge at Waterloo Lake invites runners to tackle rugged trail distances in a wild, scenic lakeside setting. Held at Waterloo Lake Park (1101 S. Waterloo Lake Dr, Denison, TX), the event offers 50K, Marathon, Half Marathon, 10K, 5K, and a Lake‑view Fun Run/Walk, creating something for every level of trail enthusiast.
Event History & Format
Launching its second year in 2025, Caveman Endurance—founded by ultrarunner Jeff Colgrove—has quickly become a grassroots standout in northeast Texas. Designed to blend fun and challenge, the race loop weaves through terrain peppered with dirt, rocks, roots, and even a cave mid‑course, framed by lakeside panoramas.
Runner Experience
The compact loop (10 K) is repeated as needed—twice for the half marathon, three times for the marathon and 50K—letting participants stay on course while supporters cheer at the central aid pavilion. Expect two aid stations: one at start/finish and one roadside around mile 4, stocked with snacks, water, electrolyte drinks, and oranges to fuel you through each loop.
What Makes It Unique
The charm lies in trail authenticity and community spirit: low‑pressure vibe, small‑field atmosphere, and hefty participation value ($75 for the half, $90 for the marathon, $100 for the 50K—all including shirt and medal). Awards are handed to overall and age‑group podium finishers, and refunds are offered as race credit if canceled early.
