About this Race Series
Rio Colorado Ultra Slam™
Ultra Slam 200
The 50 Mile Tier. Four races. 200 miles in one year.
The Ultra Slam 200 is the all-arounder's tier. Four races of at least 50 miles each, chosen from the ten qualifying events on the Rio Colorado calendar. Trail races or backyard ultras that reach 50 miles both count. Build your year the way you want to run it.
How to Earn It: Complete four qualifying races of at least 50 miles each within the 2027 calendar year. Backyard ultras count when you reach 50+ miles (12 yards or more). Limited to 50 athletes.
Qualifying Races
Select any four of the ten races below. Click any race name to view course details, elevation, aid stations, and registration for that specific event.
Austin Solstice Circuit ›
June, Austin. 52 Miler or 12-Hour Solo. Longest day of the year, circuit format.
Big Bastrop Backyard Ultra ›
Bastrop. Last Runner and Last Rucker Standing formats. Reach 12+ yards to qualify.
Colorado River Run 50 Mile ›
The namesake race. Trails along the Colorado River itself.
Star of Texas 50 Miler ›
A signature Central Texas ultra. Hills, heat, and heart.
Canyon of the Eagles New Year's Trail Challenge ›
January, Lake Buchanan. Start your year at the headwaters of the Colorado. 100K option qualifies.
The Lost Pines Endurance Fest 50 Miler ›
Bastrop's iconic pine forest. Sandy loam, singletrack, and shade.
Matagorda: The Gulf Coast Backyard Ultra ›
The Gulf Coast finale. Backyard format on Matagorda Bay, the mouth of the Colorado River. Reach 12+ yards to qualify.
Rodeo Trail Run of Austin Backyard Ultra ›
Austin backyard ultra with rodeo flair. Last Cowboy or Cowgirl Standing. Reach 12+ yards to qualify.
Bluebonnet Trail Run 50 Miler ›
Spring in Texas. Wildflowers, rolling terrain, one of the most beautiful ultras on the calendar.
Austin's Backyard Ultra ›
The original Austin backyard. Last one standing wins. Reach 12+ yards to qualify.
Backyard scoring: Each yard equals approximately 4.167 miles. You must reach at least 12 yards (approximately 50 miles) at a single backyard event for it to count toward your Ultra Slam 200.
2027 SEASON | Races run January 1 through December 31, 2027
Pricing
| Tier | Early Bird Price | Regular Price |
|---|---|---|
| Ultra Slam 200 | $745 | $795 |
Your Ultra Slam 200 entry is a single bundled fee that covers all four of your chosen races. Payment plans are available at checkout: three monthly installments. Race swaps are permitted up to 60 days before the event date of the race you are dropping, subject to availability.
What You Get
- Entry into all four of your chosen 50+ mile races
- Custom Rio Colorado Ultra Slam 200 finisher buckle
- Series jacket with Ultra Slam 200 tier designation
- Ultra Slam bib number carried across all four events
- Your name on the permanent Rio Colorado Ultra Slam finisher wall
FOUNDING ATHLETE PRICING
(Year One Only)
This is the inaugural year of the Rio Colorado Ultra Slam. Founding athletes lock in the lowest price this series will ever offer and get their name on the permanent founders wall at Rio Colorado headquarters.
Register for Ultra Slam 200
Limited to 50 athletes. Founding pricing available while spots remain.
200 MILES IN ONE YEAR.
Contact Information
If you have any questions about this race series or its scoring, please use the following email address:
Included Events
Canyon of the Eagles 100: New Year’s Trail Challenge (100K & 50K ULTRA, Marathon ,13.1M RUN & RUCK, 10K & 5K)
THE EAGLE 100K ULTRA
Friday January 1, 2027
Burnet, TX US
The Lost Pines Endurance Fest
Lost Pines 50 Miler
Saturday January 16, 2027
Bastrop, TX US
Matagorda: The Gulf Coast Trail Running Festival
Gulf Coast Backyard Ultra
Saturday February 13, 2027
Matagorda, TX US
Rodeo Trail Run of Austin • Backyard Ultra (Last Cowboy/Cowgirl Standing) • 8 Hour • Marathon • Half Marathon • Backyard Ultra Relay Duos (2-Person Team)
Rodeo Backyard Ultra
Saturday March 13, 2027
Spicewood, TX US
Austin's Backyard Ultra • Marathon • Full • Half & Memorial Day Remembrance Run 4 Miler • 8 Miler
Austin's Backyard Ultra
Saturday May 29, 2027
Marble Falls, TX US
