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The Rio Grande 100 is an exciting ultra marathon that starts and finishes alongside the stunning Rio Grande River in South Fork, Colorado. Experience the incredible La Garita mountains as you traverse through diverse terrains, from arid forests to alpine tundra, reaching heights over 12,000 feet four times during the race. Enjoy the autumn colors of aspen leaves and the challenge of rocky trails in this low-key yet thrilling atmosphere. The event prioritizes runner and volunteer safety with plans in place for adverse weather conditions, making it one of the most challenging and rewarding races you will ever encounter.
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Sign up to see dealsDate: Saturday, Aug 23, 2025
Time: 8:00 AM MT
Location: 60 CR-15, South Fork, Colorado
Registration: Registration closes on Sat, Aug 9 at 11:59 PM MT.
Registration Fee: $376.25 (Increases to $429.50 after Dec 31, includes taxes and fees)
