Castle 2.5K/5K/10K 2025

August 23, 2025

South Side of Wellington Lake, near Conifer in Colorado

The Castle 2.5K/5K/10K is the highest altitude organized marathon swim event in the country at ~8,000 feet. It is hosted at Wellington Lake, near Conifer in Colorado.

Registration Opens in 2 weeks, 6 days, 18 hours, and 13 minutes

About

The Castle 2.5K/5K/10K is the highest altitude organized marathon swim event in the country at ~8,000 feet. It is hosted at Wellington Lake, near Conifer in Colorado.

Sign up to Volunteer

Race Day Schedule will be shared closer to event date.

Distances:

  • 2.5K
  • 5K
  • 10K

T-shirts are not guaranteed. We close t-shirts around 2 weeks before the race.

We will close online registration when we have reached our parking cap for this race (250 participants)

All packet pickup will be the morning of the swim. Please plan to come and pick up your packets early!

Registration

  • Registration Opens January 13, 2025
    2.5k
    $104.11
    $95 + $9.11 Movemint Fee
    Saturday, August 23, 2025
    8:00 AM
  • Registration Opens January 13, 2025
    5k
    $124.73
    $114 + $10.73 Movemint Fee
    Saturday, August 23, 2025
    8:00 AM
  • Registration Opens January 13, 2025
    10k
    $145.35
    $133 + $12.35 Movemint Fee
    Saturday, August 23, 2025
    8:00 AM

Series Passes

Event Location

South Side of Wellington Lake, near Conifer in Colorado