adidas Terrex 20K Trail Run

GO THE DISTANCE, GO FOR SPEED

COURSE CHANGE FOR 2026 & BIGGER PRIZE PURSE! A behemoth of running races, the adidas TERREX 20K Trail Run is for the boldest competitors. Destroy a near-half marathon on a difficult course that spans nearly the entire front side of Vail Mountain!

SUNDAY, JUNE 7
8:00 AM

IMPORTANT:

Registration for this event closes Saturday, June 6 at 6:00 PM.
The course map will be available 1 week prior to the race.

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Event Overview

SUNDAY, JUNE 7

One of the more challenging and rewarding 20Ks in the nation, this race invites you to line up alongside some of the Vail Valley’s best trail runners and top professionals at nearly 9,000 feet. The course—either two laps of the 10K route or a newly designed single-loop configuration—will push your fitness with sustained elevation changes and rugged mountain terrain. In addition to bragging rights on the line, the 20K prize purse is also up for grabs.

All on-mountain aid stations at the GoPro Mountain Games are now 100% cupless as part of our ongoing commitment to sustainability. To help you stay hydrated, all participants will receive a free collapsible cup at the start line to use during all Mountain Games run events. Please plan ahead and be race-ready and help us keep the mountains clean!

Times

SUNDAY, JUNE 7

8:00 AM

Rules

RACE CATEGORIES:

Open – Men
Open – Women
Nonbinary

Athlete’s age category is based on their age at the end of the calendar year on Dec 31, 2026.
Minimum age to compete is 12 years old based on the athlete’s age at the end of the calendar year on Dec 31, 2026.

COURSE, FORMAT & RULES:

Racers will be sent out in one mass wave.
- Start positions within the wave will not be pre-determined and it is up to the athlete to get into their desired start location.
Participants must follow all course markings and know/understand the course map. All course markings for this event will be black signs with RED arrows.
Racers will complete 2 laps of the 10K course.
COURSE CHANGE FOR 2026! The 20K course will be new for 2026. It will be either a revised 2-lap version of the 10K course with a new lap transition point, or a fully new single-loop course.
CUT OFF TIME: A cutoff time will be established and announced once the final course configuration is confirmed. Athletes must meet the designated cutoff in order to continue on the full 20K course.
Athletes that register for the 20K race will not be allowed to change to the 10K race and be eligible for prizes past the closing registration deadline. [Saturday, June 6, 6:00 PM].
Along the course, athletes will have to run on all types of terrain including Forest Service access dirt roads, uneven, rocky conditions, grass, loose gravel and undulating single track.
Athletes who deviate from the official course will be disqualified.
Due to the terrain, no strollers will be allowed on course.
The course map will be available 1 week prior to the race.
There are two 2 aid stations on course where water and sports drink will be provided.
- As a reminder, all on-mountain aid stations are now cupless. Participants will receive a free collapsible cup at the race start that can be used for all GoPro Mountain Games run events.
No tripping, shoving or horseplay will be tolerated and any athlete displaying unsporting conduct will be pulled from the course and disqualified.
Athletes who miss the race start may still compete, but the clock will have started at the race start rather than the athlete’s actual start time. No exceptions will be made.
Racecourse closes 10 minutes after posted start time. Racers who do not start before then, won’t be able to start.
Dogs are not permitted to run in the adidas Terrex 20K Trail Run. Please consider entering the Rocky Dog Fun Run on Thursday, June 4 if you’d like to run with your pup!