Shawnee Hills Trail Races

AUG
21-22
2027
Multi-distance trail races at Camp Ondessonk in Ozark IL featuring technical singletrack, sandstone scenery and waterfalls across 100 mile, 100K, 50K, night 50K and a hilly half marathon.
21-22 Aug 2027
100 miles 100 kilometers 50 kilometers 13 miles

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Shawnee Hills Trail Races : Camp Ondessonk, Ozark IL

The event is a multi-distance trail race weekend held at Camp Ondessonk in the Shawnee National Forest. The courses use a figure-eight loop layout on mostly singletrack trails with intermittent fire roads. Terrain is highly technical with rocks, roots, ruts and creek crossings. Elevation consists of repeated rollers of about 50 to 150 ft per climb, totaling roughly 2,500 to 7,500 ft of gain per 50 miles. Noted natural features along the route include sandstone formations, oak-hickory and maple-beech forests, and several waterfalls such as Pakentuck Falls, Jackson Falls, Horseshoe Falls and Cedar Falls.

There are five manned aid stations stocked with water, electrolyte drinks, snacks and basic first aid. Distances between aid stations average about 5 miles and are never greater than about 8 miles. Restrooms are available at the start/finish and four aid stations.

Available distances:

  • 100 Mile: 1 short (~3 mile) prologue loop + 3 × ~32-mile loops
  • 100K: 2 × ~32-mile loops
  • 50K: 1 × ~32-mile loop
  • Night 50K
  • Half Marathon: additional loop around camp plus 13 miles on west section

Pacer rules apply for the 100 mile and 100K distances with one pacer on course at a time. Registration and shirt, lodging and distance deadlines are published for the event. Lodging includes shared treehouse accommodations and limited climate-controlled rooms; one tent per runner is included with additional tent fees. Visit the organization's website for the most recent information.

Events nearby

Fast, flat crushed limestone out and back in Vienna, Illinois offering 100 mile, 100 km, 50 mile and marathon distances with aid about every five miles.
A Last Man Standing race at Ferne Clyffe State Park using repeated 4.167 mile loops with about 600 ft climb per loop, limited to 75 runners.
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