Pi Day River Rotation

Trail26.1 km21.1 kmPi MilerComing Soon
Sunday, March 14, 2027
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Lawrence River Trails, Lawrence, KS, USA
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About the race

Celebrate your love of pi and pie! Take on the Pi Miler (3.14 miles) or the River Rotation Half Marathon on the fun, fast, and flowy Lawrence River Trails.

The 16.24 mile Pi Slam combines the Pi Miler and River Rotation Half Marathon. It is the perfect challenge to add a little more distance to your day.

After the race, enjoy some pie at the finish line with your finisher's fork!

Aid stations and hydration

Water, electrolytes, energy snacks, fruit, and other items will be available on the course.

A smaller aid station is near the 5K Loop turnaround, about halfway through the race for Pi Milers.

Half Marathoners will pass the smaller aid station during each of your loops, about 1.5 miles after leaving the trailhead and again on the way back. Half Marathoners will also have access to a larger aid station at the trailhead. You will pass it twice during the race at intervals of ~5 miles.

We encourage runners to bring your own reusable hydration bottles or cups, in keeping with the Trail Hawks motto "Kindness to Life and Land". We will provide a few cups by the water coolers at the aid stations if you are in need.

Start times

The Pi Miler begins at 7:30 AM. The Half Marathon begins at 8:30 AM.

Pi Slammers will begin with the Pi Milers and must be back at the starting line by 8:30 AM to join the Half Marathon.

Awards

  • Awards will be given for 1st, 2nd, and 3rd place in each gender overall for the Pi Miler and River Rotation Half Marathon races.
  • Pi Slam finishers receive a special swag item.
  • Pi Slam runners are eligible for place awards in the Pi Miler and Half Marathon.

Awards will be presented at the finish line.

Packet pickup

Packet pickup details will be announced prior to the race.

Volunteers

We can't do this race without our wonderful volunteers! Contact RD Kate Becker with questions. Thank you for making this event possible with your time and talents.

Deferral, transfers and DNS

If you've signed up for one of the events, but are unable to safely participate in the race, we offer the following options.

Changing distance before the race

  • Runners may contact the Race Director to transfer to a lower or a higher distance on or before February 28th.
  • Moving to a higher distance incurs a pro-rata charge.
  • No credit or refund is given for transfers to a lower-distance race.
  • You can also edit your registration on Ultrasignup and change the distance yourself.

No bib transfers

  • The Pi Day River Rotation race series does not allow refunds or transfers of entries to other participants.
  • Race numbers and official participant bibs may not be sold, transferred, reproduced, replicated, or modified.

Deferral

  • Runners may defer their race entries to the following year by notifying the Race Director on or before February 28th.

Did not start (DNS)

  • If you can't attend and haven't deferred, let the Race Director know at least seven days before the race so your name can be removed from the starters list.
  • You can also remove yourself from the race on Ultrasignup.
  • If you don't show up and haven't told us in advance, you'll be recorded as DNS in the race results.

Rules and safety

Runner safety is a top priority for our event. Respect all participants and volunteers to ensure a safe and enjoyable race for everyone.

  • Be courteous when passing or being passed. Single track trails are tight, so stay alert. Announce when you plan to pass someone, and go around them on the left when it is safe to do so.
  • Kids and families are welcome. Any child under 12 must be accompanied by an adult for the entirety of the race, and any child under 16 must have an adult present at the event. The River Trails are not suitable terrain for strollers.
  • Follow the Trail Hawks motto "Kindness to Life and Land" and pick up any wrappers, tissues, bottles, or food waste that you use on the trail.
  • Leashed dogs are allowed. Dogs must be well behaved and under control at all times, and you must pick up after your dog. Participants with dogs should line up near the back of the starting area. Ensure at all times that other participants can easily pass or navigate around you.
  • Personal music devices are strongly discouraged. No speakers are allowed. If you wear headphones, use a low volume, one earbud, or bone conduction models that allow you to stay alert.
  • To participate or volunteer in Lawrence Trail Hawks activities, you must respect the identity of runners in regards to race, sexuality, gender identity, physical ability, age and body type. Report any discriminatory language and behavior to the race director or event leader as soon as it is safe to do so.
  • Anyone found speaking or behaving in a manner that diminishes the ability of fellow athletes and volunteers to participate in a safe, comfortable, and inclusive environment will be disqualified from the race or asked to leave the event, and risks being barred from future Lawrence Trail Hawks races and events.

The course

26.1 km21.1 kmPi Miler

16.24 Miles

pi milerTrail
river rotation half marathonFlat
Cut-off1:00 PM · Combines the Pi Miler and River Rotation Half Marathon.

Half Marathon

pi milerTrail
river rotation half marathonFlat
Cut-off1:00 PM · Half marathoners must leave the aid station for their final loop by 11:45 AM.

Pi Miler

pi milerTrail
river rotation half marathonFlat

The Lawrence River Trails are relatively flat singletrack with a few short hills. They are flowy and not too technical, with only a few roots or rocks. Races begin at the Levee gate, go down through the parking lot, and enter the River Trails on the south (right-hand) side. The Pi Miler is one loop following the 5K Loop route. The Half Marathon is three loops on the trails.

Cutoffs

The Pi Day River Rotation race will have an end time of 1:00 PM. This allows our volunteers to pack up in a timely manner so the Lawrence River Trails can be free for other users in the afternoon.

For half marathoners, that allows 4.5 hours to complete your race (about a 20:35 per mile pace).

To ensure you make the cutoff time, half marathoners must leave the aid station to begin their final loop of the course by 11:45 AM. Participants who start a loop after 11:45 AM continue on the public trails at their own risk, without support from the race.

Alternate course

If the trails are unsafe for runners or vulnerable to damage due to muddy conditions, an alternative course will be provided by the Lawrence Trail Hawks Race Directors. The alternate course will most likely be on the packed-gravel Lawrence Levee Trail.

Race weekend schedule

7:30 AM
Pi Miler and Pi Slam start
8:30 AM
Half Marathon start
1:00 PM
Race end time

Location

Lawrence River Trails, Lawrence, KS, USA Open in Google Maps

City insight: Lawrence

Lawrence is a city and the county seat of Douglas County in northeastern Kansas, and it is the state's sixth-largest city. It lies between the Kansas and Wakarusa rivers and is a college town, home to the University of Kansas and Haskell Indian Nations University. The climate is continental, with hot, humid summers and cold winters, so spring and autumn are the best seasons to race.

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Good to know

Can I run with my dog?

Leashed dogs are allowed. Dogs must be well behaved and under control at all times, and you must pick up after your dog.

Mar 14, 2027
Pi Day River Rotation
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