December ultramarathons in Pennsylvania, United States

Backyard ultra format on a 4.2-mile loop along the Schuylkill River Trail, hourly starts, elimination on failure to finish within the hour

2 to 3-mile loops on mostly gravel trails and camp roads with pirate-themed celebrations

Punishing trail loop with relentless climbing and steep, repeated laps, building to 6,400+ feet of elevation gain over 50K.

Single track trails with rolling elevation around Blue Marsh Lake, offering a manageable challenge for all experience levels

2.2-mile loop course with lap format at Fleet Feet Mechanicsburg, annual event supporting Communities Rising initiatives for children in Southern India.