Onyx by Double Black Events
Fort McDowell, United States • 4 Apr 2026
Event
Onyx by Double Black Events is set for Saturday, April 4, 2026, at McDowell Mountain Regional Park, 16300 McDowell Mountain Park Dr, Fort McDowell, AZ 85264. The event offers two timed divisions: Onyx (4-hour) and Onyx Ultra (8-hour). Entry prices listed are $80 for the 4-hour division and $125 for the 8-hour division. Registration closes April 2, 2026 at 10:00 pm MST. A county park entry fee of $7 is required at the gate; card or exact change only.
Format and course
The race uses a points-based format rather than fastest time. Competitors may use any mix of the five available trails and may repeat routes. Trail roundtrips range from 0.5 miles up to 12 miles. Runners earn standard points by bringing back a flag from a route turnaround, or 1.5 times the points value by bringing back a sandbag. Participants receive wristbands for each route they complete. Leaderboard scoring is updated after each lap. Awards are planned for the top three male and top three female finishers in each timed category.
Support and extras
A Points Tent and Recovery Zone are located at the course base. The event includes well-stocked aid stations, nutrition items from sponsors, free photos and videos, free finisher swag, finisher awards, and a ticket for a post-race raffle. An official course map will be released two weeks before the event; a race day program will be sent one week before the event. Visit the organization's website for the most recent information.