Colorado River Run 250K • 100 Mile • 50 Mile • 50K • Marathon • Half Marathon & Ruck • 10K • 5K • Kids 1K

COLORADO RIVER RUN Run to the River "Out here on these trails, not all who wander are lost, some are simply finding their strength."

250K 100 MILES 50 MILES 50K & MARATHON HALF MARATHON 10K & 5K

An invigorating trail adventure at McKinney Roughs Park

Connect with Nature, Challenge Your Endurance Set along the scenic banks and trails surrounding the majestic Colorado River at McKinney Roughs 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! Click here to purchase your crew and/or spectator/visitors pass  

Race Distances

250K Ultramarathon

Start Time: 7:00 AM (11/27) Cut-off: 7:00 AM (11/29)

Beyond 100 miles — our most extreme distance for experienced ultra runners only. A single finish gets you the Rio Colorado Ultra Slam buckle.

100 Mile Ultramarathon

Start Time: 9:00 AM (11/27) Cut-off: 11:30 PM (11/28)

The ultimate river trail adventure for endurance athletes

50 Mile Ultramarathon

Start Time: 9:00 AM (11/27) Cut-off: 9:30 PM (11/28)

Challenge yourself with breathtaking river views

50K & Marathon (26.2 miles)

Start Time: 9:00 AM (11/28) Cut-off: 8:30 PM

Classic distance with unforgettable scenery

Half Marathon (13.1 miles)

Start Time: 9:00 AM (11/28) Cut-off: 5:00 PM

Perfect distance to enjoy the river trails

10K (6.2 miles) | 5K Run/Walk (3.1 miles)

Start Time: 9:00 AM (11/28) Cut-off: 5:00 PM

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.   Course Records:  100 Miles: Jeffrey Bergeron (M) 29:26:45 50 Miles: Andrea Fogliato (M) 8:35:56 50K: Marcos Gonzalez (M) 6:08:58  Marathon: Elissa Schoening 5:13:08 Half-Marathon: Jake Johnson (M) 1:32:03, Hannah Lee Cullum (F) 1:54:49

What You'll Experience   Terrain: Mix of single-track trails, dirt paths, and occasional technical sectionsScenery: Stunning river views, natural habitats, and diverse ecosystemsElevation: Moderate with some challenging climbs and descentsSupport: Well-stocked aid stations with friendly volunteersCommunity: Welcoming atmosphere for runners of all abilities   Rio Colorado Ultra Slam Every Fit Foundation finish counts toward the Rio Colorado Ultra Slam. Complete 250 km across our 2026 races and the buckle is yours, in addition to your individual race awards. 

Ready for 100 Miles? Access your complete 100-mile training plan to prepare for this epic adventure! ACCESS TRAINING PLAN

What's Included

Custom Finisher Medal (Buckle for Ultra Distances) Unique medal for all finishers and buckles for ultra-distance runners. A single 250K finish also qualifies you for the Ultra slam buckle outright.

Aid Stations Fully stocked with nutrition and hydration. Our main aid station at the start/finish hub is fully stocked with hot food, fruit, pickle juice, cold drinks, and more. This is your primary fueling point each loop. On-course aid stations provide water and light supplies to keep you moving between loops. Plan to refuel at the hub each time you come through.

Support On-course and at finish line

Pacing Allowed for Ultra Distances Pacers are allowed for the 250K (after mile 62), 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. Children MUST be registered to participate

Volunteer Opportunities  

  We Need Help With:   Course MarshalsAid Station SupportRegistration/Packet Pickup Assistants

  All Volunteers Receive:   Race shirtSnacksCommunity service hoursFuture race credit

  Shifts Available:   Morning: 7:00 AM - 1:00 PMAfternoon: 1:00 PM - 6:00 PMEvening: 6:00 PM - 11:00 PM Email: info@atxactive.com to volunteer 

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! REGISTER NOW!

Fit Foundation Half Marathon Ruck 13.1 miles. Same trail. Weight on your back.

Rucking is covering ground with a loaded pack. Same course as the half marathon, same start, same finish line, same cutoff. The only difference is what you are carrying and who you are racing. Ruckers are scored as their own division with their own results and their own awards. You are not competing against the runners and they are not competing against you.

Minimum pack weight 20 lb  ·  30 lb 20 lb if you weigh under 150 lb. 30 lb if you weigh 150 lb or over.

The rules Weigh in before the start. Bring your pack to the start area at least 30 minutes before your wave. We weigh it, we tag it, you go.Water does not count. Your hydration, food, phone and layers are on top of the minimum. The weight is dry weight.Any weight is fine. Ruck plates, bricks, sand, books, dumbbells. It has to be secure and it has to stay in the pack for the whole course.You finish with what you started with. Weight is checked again at the finish. Anything under the minimum moves you out of the ruck division.Carry it yourself. No handing your pack off, no dragging, no wheels.Run, walk, or anything between. There is no rule about how you move, only about what you carry.Rucking counts toward your Run the River mileage exactly the same as running. Thirteen point one miles is thirteen point one miles. First time rucking? A loaded pack on a trail is harder than the same distance on your feet, and most people go out too quick. A few things that help: Train with the weight before race day. Even two or three loaded walks makes a difference to your shoulders.Get the load high and tight against your back. Weight that sits low and swings will wreck you by mile six.Wear the socks and shoes you have already tested. Rucking changes how your feet hit the ground.Pack the weight so it cannot shift. Movement inside the pack is the most common reason people stop.

Same trail. Same finish line. Considerably more of it on your back.