Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K
- Date
- November 27–28, 2026
- Location
- 4000 Shaw Dr., Marble Falls, TX
- Distance
- 100 Mile Run · 50 Mile Run · 50K & more
From the Organizer
COLORADO RIVER RUN
Run to the River
"Out here on these trails, not all who wander are lost, some are simply finding their strength."
An invigorating trail adventure at Turkey Bend Park
Connect with Nature, Challenge Your Endurance
Set along the scenic banks and trails surrounding the majestic Colorado River at Turkey Bend Park, this event offers a unique opportunity to connect with nature while testing your limits. Run through diverse landscapes, including riverbanks, rugged trails, and serene natural habitats as you embrace the spirit of outdoor adventure.
The Colorado River Run promises to be a memorable experience for runners and nature enthusiasts alike. The course layout is designed to highlight the river's most picturesque spots while providing a challenging terrain for runners of all levels, from competitive athletes seeking to set personal records to recreational runners looking for a unique trail experience.
Register by November 7, 2026 to guarantee your race shirt!
Reserve an 8-person camping spot here
Race Distances
100 Mile Ultramarathon
The ultimate river trail adventure for endurance athletes
50 Mile Ultramarathon, 10 Miler, 5 Miler
Challenge yourself with breathtaking river views
50K & Marathon (26.2 miles)
Classic distance with unforgettable scenery
Half Marathon (13.1 miles)
Perfect distance to enjoy the river trails
10K (6.2 miles) | 5K Run/Walk (3.1 miles)
Family-friendly option - children can accompany registered parents for free!
Course Description
Scenic River Trails
The course is designed to highlight the Colorado River's most picturesque spots while providing a challenging terrain for runners. You'll experience diverse landscapes, including riverbanks, rugged trails, and serene natural habitats.
Fully Supported Adventure
Fully stocked aid stations along the course, providing hydration, nutrition, and medical assistance to ensure your safety and well-being. Our eco-friendly practices, such as waste reduction and the use of sustainable materials, minimize the event's environmental footprint.
What You'll Experience
- Terrain: Mix of single-track trails, dirt paths, and occasional technical sections
- Scenery: Stunning river views, natural habitats, and diverse ecosystems
- Elevation: Moderate with some challenging climbs and descents
- Support: Well-stocked aid stations with friendly volunteers
- Community: Welcoming atmosphere for runners of all abilities
Ready for 100 Miles?
Access your complete 100-mile training plan to prepare for this epic adventure!
ACCESS TRAINING PLANWhat's Included
Custom Finisher Medal
Unique medal for all finishers
Aid Stations
Fully stocked with nutrition and hydration
Support
On-course and at finish line
Pacing Allowed for Ultra Distances
Pacers are allowed for the 100 Mile Run (after mile 50) and 50 Mile Run (after mile 30) to provide safety and encouragement during later stages. One pacer per runner is permitted on course at any time. Pacers must register at the designated check-in area, sign a waiver, pay a $15 fee, and wear an official "PACER" bib. Pacers must be 18+ (16-17 with parental consent), can only enter/exit at aid stations, and cannot provide physical assistance or carry the runner's supplies. Pacers may switch at any aid station but must check in with station personnel. Pacers are only eligible for water and emergency medical support at aid stations.
Family-Friendly 5K Option
Parents are welcome to run or walk the 5K course with their young children at no additional cost!
Organized in partnership with Healthy Kids Running Series Cedar Park. Proceeds support HKRS Cedar Park youth running programs.
Volunteer Opportunities
We Need Help With:
- Course Marshals
- Aid Station Support
- Registration/Packet Pickup Assistants
All Volunteers Receive:
- Race shirt
- Meal and snacks
- Community service hours
- Future race credit
Shifts Available:
- Morning: 7:00 AM - 1:00 PM
- Afternoon: 1:00 PM - 6:00 PM
Email: info@atxactive.com to volunteer or click here
Ready for Your Colorado River Adventure?
Join us for this unique trail experience along the scenic banks of the Colorado River. Challenge your endurance and connect with nature!
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
65°
Typical Low
43°
Chance of Rain
21%
Based on US Climate Normals data from Burnet Muni Ap, 11 mi from the venue.
Host City
About Marble Falls, TX
Population
7,255
as of 2023
Elevation
806 ft
Nearest Airport
GRK
Killeen Regional Airport / Robert Gray Army Airfield · 43 mi
Major Hub
AUS
Austin Bergstrom International Airport · 45 mi
Time Zone
Central Time
From Endurance Grid
A small town race. Lodging near the start could be limited, so book early.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K, put it on the calendar, and turn “someday” into a start date.
172
Days to train
- Race
- Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K
- Date
- November 27–28, 2026
- Location
- 4000 Shaw Dr., Marble Falls, TX
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From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it's the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer's event page.
The half marathon is the distance where you find out what you're actually made of. Long enough to demand real preparation. Short enough that it doesn't consume your life to train for it. Most people who run their first half describe it as the race that changed their relationship with what they're capable of. Once you cross this finish line, the bar moves. That's not a warning — that's the point.
Race day energy varies by event size, but the finish line feeling is the same regardless. Big races keep the noise going the whole way. Smaller races give you stretches where it's just you and the miles — and that solitude becomes its own kind of fuel.
The half marathon rewards people who show up for the boring training miles.
How long to train: 10–14 weeks. If you're already running consistently, 10 weeks of structured buildup is enough. If you're building from a casual base, give yourself 14.
Running
From 5K to marathon, running races are the most accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Frequently Asked Questions (FAQs)
- What is the Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K?
- Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K is a running race held in Marble Falls, Texas on November 27, 2026. It is one of the many endurance events listed on Endurance Grid, a multi-sport endurance event calendar covering running races, triathlons, HYROX, and more endurance sports across the United States. Find more running races near you or explore our sports guides to learn what race day actually feels like.
- When and where is the Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K?
- Friday, November 27, 2026 in Marble Falls, Texas at 4000 Shaw Dr., Marble Falls, TX. Check the event page for exact start times and wave schedules.
- How do I register for the Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K?
- Registration is handled through the event's registration page. Confirm pricing and distances there, and sign up.
Colorado River Run 100 Mile • 50 Mile • 50K • Marathon • Half Marathon • 10K • 5K
Nov 27, 2026