Brazos Bend 100

December 5th, 2026 Sponsored by Altra Running and NeverSecond Western States 100 Lottery Qualifier (sub 32-hour 100-mile) with 119 qualifiers in 2024 and 133 qualifier in 2025! This is the December edition of our popular Brazos Bend races with the marquee event being the 100-mile. 2026 is the 12th Annual Brazos Bend 100! ​Flat trails. Big wildlife. Texas-sized support. Welcome to the Brazos Bend 100, where your next adventure is waiting just south of Houston and Sugar Land. ​Run beneath towering, Spanish moss-draped oak trees, alongside scenic lakes and bayous, and through one of Texas’ most beautiful state parks. Brazos Bend is home to an incredible variety of birds and wildlife—including the famous American alligator. Keep your distance, enjoy the view, and you might leave with your most memorable race photo yet! ​With a nearly pancake-flat course featuring crushed gravel paths, shaded hiking trails, and smooth horse trails, Brazos Bend is built for first-time trail runners and experienced ultrarunners chasing a personal best. December typically brings favorable running weather, although Texas always keeps things interesting. ​Come for the buckle. Stay for the community. Our 100-mile and 100K finishers earn a distinctive Brazos Bend belt buckle, supported by an enthusiastic volunteer community and Texas-sized aid stations around the course. Expect overly stocked buffet tables, encouragement, and people ready to help you keep moving toward your finish. ​Chasing Western States? The 100-mile race offers an early opportunity to earn your qualifying finish and take another step toward the starting line in Olympic Valley. ​You don’t have to run an ultra to experience the adventure. The half marathon and marathon are a perfect introduction to trail running and the atmosphere of an ultra weekend. Bring the family, cheer on your runners, and let the little adventurers enjoy the free kids race. ​Buckle on the Bayou at Brazos Bend with Trail Racing Over Texas. Complete the 50K or 50M in April, AND the 100K or 100M in December of the same calendar year to earn the Brazos Bend Challenge Coin. Cutoff Times: for ALL races, the finish line closes on Sunday at 2 PM (32h 100M, 31h 100k, 31.5h Marathon, 31h Half Marathon). Final lap starts will be assessed to meet the course time limit at the discretion of the race director and staff. Information for the 2026 event is continuing to be updated as we get closer to event day. We do not expect any major changes, but stay tuned to your email for updates. The RunSignup page is your best place for event information. Please try our AI Chatbot to ask any questions you may have. Your RunSignup account is the best place to update or make changes to your registration with lots of options available depending the proximity to race day.