Brazos Bend 100

Race Date

December 6th-7th, 2025

Event Sponsor

Sponsored by Altra Running

Qualifying Event

• Lottery Qualifier: Western States 100 Lottery Qualifier (sub 32 hour 100-mile) with 119 qualifiers in 2024!

Race Overview

• Event Type: This is the December edition of our popular Brazos Bend races with the marquee event being the 100-mile.
• Race Significance: The Brazos Bend 100 is the largest trail race in Texas and one of the fastest trail races in the world.
• Course Features: The course is 99.9% flat, and the only "hill" is a 10-foot rise over 0.1 of a mile.
• Support: Incredible support from four aid stations per loop.

Course Conditions

• Running Surface: The ~16.7mi loop features hard crushed rock, soft hiking trails under tree canopy, and smooth horse trails.
• Shoe Requirement: Most runners get away with a road shoe.
• Weather: Conditions in December can have a mix of anything but are typically great for running.
• Wildlife: Brazos Bend is most known for its abundance of birds and American Alligators among other wildlife.

Challenge Coin

Complete the 50K or 50M in April 2025, AND the 100K or 100M in December 2025 to earn the Brazos Bend Challenge Coin.

Cutoff Times

For ALL races, the finish line closes on Sunday at 2 PM:

• 100M: 32h
• 100K: 31h
• Marathon: 31.5h
• Half Marathon: 31h

Final lap starts will be assessed to meet the course time limit at the discretion of the race director and staff.

Additional Information

Information for the 2025 event is continuing to be updated as we get closer to event day, we do not expect any major changes but stay tuned to email for updates. A participant information packet will be shared in November.

Registration Link

You can register for the race here.