DownValley Dirty Dozen races - Summer 2026

New Castle Trails’ 2026 Downvalley Dirty Dozen 

Alder Park Start  all races

MTB Race —20 miles  Saturday 8/1 · 7:00 am start ~3,800 ft of climb on singletrack ·$95

MTB Race —7 miles  Saturday 8/1 · 9:30 am start  ~1,000 ft of climb on singletrack ·$75

Trail Running Race —10K  Sunday 8/2 · 8:00 am start ~1,100 ft of climb ·$75

 Combined Category —Run the 10K+ride the 20-mile MTB

Saturday 8/1 MTB + Sunday 8/2 Run · your combined results get own category ·$150 for both races. 

Program Details
  • Registration Status:
    Open
  • Regular Registration:
    Wednesday, June 10, 2026 - Friday, July 31, 2026
  • Program Duration:
    Saturday, August 1, 2026 - Sunday, August 2, 2026
  • Regular Registration Cost:
    $75.00 - $150.00
Offerings
OfferingRegistration DatesCostStatus
Adult Sat. Aug.1st MTB Race 20 miles 06/10/26 12:00 AM - 07/31/26 10:00 AM$95.00Open
Adult Sat. Aug 1st MTB Race 7miles 06/10/26 12:00 AM - 07/31/26 10:00 AM$75.00Open
Adult Sun. Aug. 2nd Trail Run 10K 06/10/26 12:00 AM - 07/31/26 10:00 AM$75.00Open
Adult Combo Sat & Sun MTB 20mile&Run 10k 06/10/26 12:00 AM - 07/31/26 10:00 AM$150.00Open
Youth Sat. Aug 1st MTB Race 20 miles 06/10/26 12:00 AM - 07/31/26 10:00 AM$95.00Open
Youth Sat. Aug. 1st MTB 7miles 06/10/26 12:00 AM - 07/31/26 10:00 AM$75.00Open
Youth Sun Aug.2nd Trail Run 10K 06/10/26 12:00 AM - 07/31/26 10:00 AM$75.00Open
Youth Combo Sat&Sun MTB 20 mile & 10K 06/10/26 12:00 AM - 07/31/26 10:00 AM$150.00Open