Coldwater Rumble

Event overview

The Coldwater Rumble Trail Runs take place Saturday, January 17, 2026 at Estrella Mountain Regional Park, Goodyear, AZ, with the start/finish at the Estrella Mountain Competitive Track. Multiple distances are offered:

• 100 Mile
• 100K
• 60K
• 40K
• 10 Mile
• 5 Mile

Registration for the event closes on Monday, January 12. All finishers receive a finisher award and points toward the Desert Runner Trail Series. The park charges a vehicle entry fee; camping at the Competitive Track is available for the weekend for a fee. Tent and cot rentals are available through event registration.

Course and logistics

Courses follow desert trails in the foothills of the Sierra Estrella mountains and use a mix of surfaces: crushed granite single track, rocks and boulders, sandy washes, old jeep roads, and dry wash beds. The 100 mile format uses two 10-mile red loops followed by three 27-mile blue loops; runners pass the start/finish area multiple times. A 1.5-2 mile section called Corgett Wash can be very sandy; gaiters are recommended. Hiking poles are allowed.

Aid stations are provided and the event operates as a cupless race - reusable cups are encouraged. Drop bags are allowed at the Rumble HQ for all distances; 100M, 100K, and 60K runners may also use a remote drop bag at Horse Thief Aid. Crews are permitted at Rumble HQ and limited crew access is allowed at Horse Thief Aid. Pacers are permitted for 100M and 100K under specified rules. Time limits vary by distance. Visit the organization's website for the most recent information.