Dirty Dozen 20 Mile

Race - Aug 2, 2025

Dogs No Dogs

E-Bikes Not Allowed

Features Downhill · Flow

The Dirty Dozen isn't just a name — it's a challenge. Covering 20 miles and over 3,000 feet of climbing, this mountain bike race in New Castle, Colorado, throws down a full-body test of endurance, skill, and grit on the Colorow Trail System.

Racers will tackle steep climbs, fast descents, and of course, the infamous "Dirty Dozen" switchback segment — a punishing series of twelve tight turns on the Stairway to Heaven trail, known for shredding legs and testing resolve.

This isn't your average XC loop — it's a rugged, raw ride through some of western Colorado's most scenic and challenging terrain. Whether you're chasing the podium or just out to prove something to yourself, this race delivers.

1. Race begins at VIX Ranch Park with a neutral rollout behind New Castle PD
2. Racing begins after a left up C Avenue
3. Left at Medaris Ditch
4. Left at South Wildhorse
5. Cross Castle Valley Blvd onto Buckhorn
6. Left on connector trail
7. Right on Alder Park Trail
8. Cross Alder Drive
9. Right on Alder Park Trail
10. Left on Connector Trails
11. Right on Stairway to Heaven
12. Left on East Colorow
13. Right on Half Time
14. Left at Half Time split
15. Left on Zeni's
16. Left on Half Time
17. Left on Crimson
18. Right on Jasper
19. Left on Faye's
20. Left on Sallee Key
21. Left on Uncle Joey's
22. Up Dante's Peak
23. Right on Further Out
24. Right on Dante's Flow
25. Up Alpha Beta
26. Left up Tuck N Roll
27. Left on Faye's
28. Left on Jasper
29. Left on Ole Roller
30. Straight on Lookout Trail
31. Left on East Colorow
32. Back to VIX to finish