Mar 12, 2022 at 7:30 AM

Pi Day River Rotation Half

Lawrence River Trails

Lawrence KS, 66044


Event Facebook page

Entry Fee $45
(Lowest or Early Registration)

Entry Fee 2 $160
(Highest or Late Registration)

Prize Money: no


  • 13.1M
  • 26.2M
  • 5K

Type: Trail

Participant Limit: 250

Percent of the course on un-paved trails: 95%

First Year of the Event: 2011

Men's Record: M: 1.23.12

Women's Record: W: 1:34:02


Trail run on a smooth, fast course with a few hills sprinkled in for fun. The Pi Miler, starting at 7:30 am, is 2 loops of different distances, totaling 3.14 miles (just over a 5K). The River Rotation Half Marathon, starting at 9 am, is a 13.14 mile three-loop course, alternating between counter clockwise and clockwise directions. New for 2018, we are introducing the Pi Day River Rotation Full Marathon! Starting at 8:30am, runners will take a short lap, and 5 longer loops bringing you to 26.21 miles. There will be a single aid station located at the trail head, and aid station at finish line. Runners in the marathon and half-marathon will pass the aid station at 5-mile intervals. Water, Tail Wind, Honey Stingers, fruit, and other items will be available at the aid station. After the race, enjoy some homemade pie at the finish line!


Race event photo
Race event photo
Race event photo


Past Event Dates

Held on Mar 12, 2022

Held on Mar 14, 2020

Held on Mar 09, 2019

Held on Mar 10, 2018

Held on Mar 11, 2017

Held on Mar 12, 2016

Held on Mar 14, 2015

Held on Mar 16, 2014

Held on Mar 10, 2013

Held on Mar 04, 2012

Held on Mar 19, 2011

Event Results