The Great Divide Ultra

Event overview

The Great Divide Ultra takes place June 6-7, 2026 in Divide, Colorado at Mueller State Park. The festival includes multiple trail ultras:

• 100 mile
• 100k
• 50k
• 25k
  Night-run options are offered for the 25k and 50k as part of the festival. Registration closes June 3. Registered entrants receive a gender-specific race shirt, a BOCO trucker hat, a personalized bib and finishers’ award, and a belt buckle for 100 mile and 100k finishers.

Course and logistics

All races run on looped single- and double-track trails through the rolling meadows of Mueller State Park. The 100 mile course comprises six 14.8 mile loops and one 10.5 mile loop. Elevation range across the courses is between 9,189 and 9,743 feet. Reported elevation gains are approximately 16,071 feet for the 100 mile, 8,500 feet for the 100k, 4,200 feet for the 50k, and 2,100 feet for the 25k.

All aid stations are crew accessible and allow drop bags. Aid station spacing ranges from about 4.3 to 6.1 miles. Typical aid station supplies include Tailwind, Muir Energy gels, sweet and salty snacks, fruit, and soda; selected stations offer warm food. The course is accessible to emergency vehicles and aid stations are relatively close to one another.

Crew and pacing policies allow crew access at the Livery and Hart-Lee Homestead aid stations. Pacing is permitted for the 100 mile and 100k under the event rules. Parking and shuttles are organized from the Livery area and the John Wesley Ranch, which is located about 2.2 miles from the start/finish area.

Weather and pack pickup

Weather in Divide can be variable in late spring; average temperatures range from the mid 60s as a high to the mid 40s as a low. Packet pickup is scheduled at Colorado GearLab in Woodland Park the day before the event. Visit the organization's website for the most recent information.