Fat Ox

48/24/12/6 Hour, 100 Mile, 100K, 50 Mile, 50K - The 2025 Fat Ox Endurance Runs host the USATF 24-Hour Championship on November 22. A 48 hour family fixed-time festival at Estrella Mountain Regional Park. Run your own experiment and push beyond your limits on the USATF Certified 0.988178 mile course. Perfect for your first ultra, your first 100-mile, or your own personal best.