Brazos Bend 100

DEC
5-6
2026
Multi-distance trail event at Brazos Bend State Park with half, marathon, 50 and 100 mile options on a mostly flat, mixed-surface loop; 100 mile is a Western States qualifier.
5-6 Dec 2026
100 miles 100 kilometers Marathon Half Marathon

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Brazos Bend 100

Brazos Bend 100 is a December trail event held at Brazos Bend State Park, located south of Houston and Sugar Land. The event offers multiple distances on a looped trail course that is nearly flat and runs through wooded areas and open surfaces.

Distances include:

  • Half Marathon
  • Marathon
  • 50K / 50 Mile
  • 100K / 100 Mile

The course is 99.9 percent flat with a single ten foot hill. Trail surfaces vary between hard crushed rock, soft hiking trails under tree canopy, and smooth horse trails. The park is noted for abundant birdlife and American Alligators; the organizer reports no incidents involving wildlife.

The 100 mile distance is an official Western States Endurance Run qualifier; runners who finish the 100 mile within 32 hours earn eligibility for the following year’s Western States lottery. Official time cutoffs published by the organizer include 32 hours for 100 mile, 31.5 hours for 100K, 31 hours for the marathon, and 30.5 hours for the half marathon.

Pacer and crew rules are specified: pacer registration opens in the final month before the race, one pacer at a time on foot, 100 mile runners may have a pacer for the final two loops, 100K runners for the final loop, and no pacers for marathon or half marathon. Crew and spectators access aid stations in limited amounts; crew may not use aid station supplies.

Event awards include buckles for 100M and 100K, medals for marathon and half marathon, and a cash purse for the 100 mile overall top three finishers. Park passes are handled through event registration and state park camping must be reserved through the park system. Volunteer roles and merchandise are part of the event program. Visit the organization's website for the most recent information.

Events nearby

Bigfoot Classic in Sugar Land TX on 01/23/2027 offers multiple in person races and a virtual run, from a 50 m kids dash to a 13.1 mile half marathon.
Space City Ultra is a looped trail race at Brazos River Park in Sugar Land, Texas on February 27, 2027, offering 50K, 25K, 10K and 5K on river and wooded singletrack with full aid station support and a 500 runner cap.
Trail races at Brazos Bend State Park on April 10, 2027 offer distances from 5K to 50 mile on a mostly flat, mixed surface course with aid stations and park support.
A multi distance running event in Houston on 07/11/2027 featuring Kids Dash, 2 Mile, 4 Mile, 8 Mile, a 13.1 mile half marathon and a virtual option with medals and shirts for all finishers.
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