Sandstone Sixer

NOV
7
2026
A six hour timed loop event at Sandstone Ranch Open Space in Larkspur CO with 8 mile loops, aid every four miles and finisher medals.
Sat 7 Nov 2026

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Sandstone Sixer

The Sandstone Sixer is a six hour timed running event at Sandstone Ranch Open Space in Larkspur, Colorado, organized by Stoke Fine Racing. The event uses an out-and-back style loop repeated for the duration of the race.

The course is an 8 mile loop with about 765 feet of gain, sitting between 6,533 and 6,843 feet elevation. The loop passes back through the start and finish at mile 3.45, so runners pass an aid station roughly every four miles. Half a loop is a timed checkpoint and loops must be completed to count.

The event is cupless; participants should bring a personal drinking container. Aid is available at the start and finish, and the course is hand marked the day before the event. The organizers plan to stock aid for a full field and run timed checkpoints every half loop.

Registered entrants receive a custom hat and raffle tickets. Awards are given for distance achievements:

  • 4 loops, 32 miles: 50K finisher medal
  • 5 loops, 40 miles: 40 mile medal plus ten additional raffle tickets
  • 6 loops, 48 miles: organizers note no expectation for this distance and provide a special reward

This edition is the first running of the Sandstone Sixer. Visit the organization's website for the most recent information.

Events nearby

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A backyard ultra at Greenland Open Space in Larkspur, CO, run as repeated 4.167 mile (6.706 km) loops until one runner completes a final solo loop and wins.
Trail races at Greenland Open Space near Larkspur offer four dirt-trail distances with looped courses, aid stations, timing, and awards.
Invitation-only Colorado endurance event on May 1, 2027 with a 40-person field, unpublished course, heavy off-trail navigation, minimal aid, and mandatory map and compass skills.
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