Mosaic Trail Race
- Running
- 50 km
- Marathon
- Half Marathon
- 15 km
- 10k
- 5k
- 3 km
- 2 km
The Big Texas Ultra is a premier trail running event taking place on November 14-15, 2025, at Lake Georgetown. Runners can choose to participate in different races: 100K Championship (Qualifiers Only), 100K, 50K, and 15K.
The event features a winding 31.1-mile loop course that promises stunning views and a challenging run.
Registration closes on Friday, November 14, at 11:59 PM CT. Be sure to register early as spots are limited due to parking capacities at Russell Park, and the event will sell out.
To be eligible for the 100K Championship, runners must finish in the top 7 in select qualifying races. However, participants can still register for the 100K event to earn a finisher's buckle.
More details regarding refunds and discounts for active duty military and first responders can be found on the official website.
Pre-race emails with further details will be sent out 1-2 days prior to the race day. There is no race day registration and no waitlist available.
All prices are inclusive of taxes and fees.
100K Championship - Registration | $205.85 | See |
100K - Registration | $205.85 | See |
50K - Registration | $152.60 | See |
15K Saturday - Registration | $82.18 | See |
15K Friday - Registration | $82.18 | See |
Help us keep everything accurate. Report any issues with this event.