CASTLE ALPINE

Race Date: September 13, 2025


28k Solo or Relay – Crazy Vert, Beautiful Terrain


Our Hosts:
Ski Castle

Get into fall running mode and enjoy the Castle Mountain Resort Area. Castle is a secluded gem of a place that everyone should make an effort to visit.

Castle Alpine Trail Race (let's call it CAT, OK?) combines wide open vistas, rugged single track, off-trail running, and so much delicious climbing. While it isn't an extraordinarily long race distance-wise, CAT is like a schoolyard bully - it's going to rough you up and doesn't relent the whole day.

This is a classic trail run covering two mountain summits and one of the most serene alpine valleys in the region. Each stage starts and ends at Castle Mountain Resort, so you don't even really need a support crew - just park your kit in the staging area and do some quick transitions. Leg 1 runs clockwise, Leg 2 counterclockwise, and Leg 3 clockwise.

After the race, Castle Mountain is planning some live music and more fun as we shut down the mountain. Castle offers a variety of accommodations including private rooms, hostel, and Air BnBs so make a weekend out of it and enjoy your stay. Being that it is September, you can expect a chance of snow and definitely a bone-chilling wind at the top of the mountain, or it can be hot... so bring all the gear!

While you're here, check out the flora and fauna. Castle is known for its wildlife viewing and exploring in the spring through fall, before the ski season starts.

Climb to the heights of Castle!

Be sure to check out the Racer Details for complete event information.

Ultra Trail du Mont BlancTrail Sisters Approved

Race Details


Date/Start Time:
September 13, 2025

  • Friday
    • 5:00pm-8:00pm – Racer Check-in
    • 7:00pm – Racer Meeting
    • 7:45pm – Volunteer Meeting
  • Saturday
    • 6:30-8:30am – Late check-in (by reservation only)
    • 9:00am – Race Start
    • 2:00pm – Live Music
    • 5:00pm to 6:00-ish – Dinner
    • 5:30pm – Race Ends
    • 5:30pm – Awards
Duration:
8.5 hours
Course:
Registration:
Open to solo runners and teams of 2 to 3.

200 racers total
Registration Opens:
October 1, 00:00hrs (MST)
Registration Deadline:
September 10; 23:59hrs (MST) or when full
Support Crew:
Support crews are allowed to station themselves near the transition area.
Drop Bags:
If you do not have a support crew, you are allowed to leave a bag at the TA. Make it something noticeable and waterproof. While we have tents, it isn't always possible to keep everything out of the rain when the wind starts blowing.
Aid Stations (CPs):
  • CPs (checkpoints) are located throughout each stage
  • The TA (transition area) is the central hub and where relay teams tag off
  • All stages have at least one CP
  • Racers can cache gear at the TA only
  • CPs are staffed and have drinking water available with some snack foods
Extra Activites:
Castle Mountain Resort is planning some live entertainment for the evening. We will also have an impromptu bocce tournament for those who are hanging around, and maybe a few other fun things.
Categories:
  • Female Solo
  • Male Solo
  • Co-ed Team
  • Female Team
  • Male Team
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