The Shortest Day

DEC
19
2026
Test your endurance at Box Hill with this dawn to dusk trail challenge. Complete as many 10 mile loops as possible before the winter sun sets in this scenic winter event.
Sat 19 Dec 2026
10-Mile Trail Loop Dawn-to-Dusk Winter Trail...

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The Shortest Day Winter Trail Challenge

The Shortest Day is an endurance trail event located at Box Hill in Dorking. This event follows a dawn-to-dusk format where participants attempt to complete as many laps as possible between sunrise and sunset. The challenge takes place on a winter trail course starting from the Box Hill Main Car Park.

The event is designed around a single 10-mile trail loop. Each lap features approximately 2,400 feet of elevation gain. Participants have the flexibility to conclude their run after completing any full loop within the designated daylight hours. This format allows runners to determine their own total distance based on the remaining light.

Registration is open to individuals aged 18 or older. The event provides several amenities for participants, including:

  • Aid stations
  • Medical cover
  • Full insurance
  • Finishers medals

The course utilizes the natural terrain of Box Hill, offering a vertical challenge during the winter season. The event is organized by The Trail Run Collective and requires pre-entry through the registration system. Visit the organization's website for the most recent information.

10 mi
10-Mile Trail Loop
Dawn-to-Dusk Winter Trail Challenge