6hr ultramarathons in Arizona, United States

Flat 500-meter USATF-certified crushed gravel loop at Nardini Manor, overnight hours on scenic, illuminated grounds

Rugged Arizona Snowbowl trails with alpine scenery, technical paths, and relentless elevation gain up to 11,500ft on steep mountain loops.

USATF certified 0.99-mile flat sidewalk loop at Estrella Mountain Regional Park, with foothill views and multi-day ultradistance formats

Gentle elevation across single and double track loops at Arrowhead Mountain, featuring lush desert scenery and a well-groomed, fast course

Scenic two-mile loop at Buffalo Park with 3, 6, and 12-hour fixed-time races, alternating directions every two hours

Flat, fast USATF Certified 500-meter gravel loop at Nardini Manor with 6, 12, or 24-hour timed options and on-site aid station