Pulling race details. Checking the course notes.
Pulling race details. Checking the course notes.


Race reviews
Race-day experiences shared about CEROX IRON + IRON X 2026.
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Cerox Iron and Cerox Iron X are functional fitness challenges held in Frederick, CO on August 22, 2026. Participants navigate eight fitness zones featuring rowing, skiing, deadlifts, sandbag work, lunges, farmer carries, bike calories, and burpees. Cerox Iron X doubles the repetitions and distances compared to Cerox Iron. Both events offer individual and two-person team divisions, with teams able to distribute the zone work as they choose. Estimated wave start times are 11 AM for Iron X Individual, 12 PM for Iron Individual, 1 PM for Iron X Teams, and 2 PM for Iron Teams.
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