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The perfect warm up or training!

370 Lakeside Open Water Swim


Your chance to warm up on the race course!

Open Water Swim DETAILS


370 Lakeside Park

1000 Lakeside Park Drive

Saint Peters, MO 63376

TIME: 10:00am – 12:00pm

Optional swim clinic to help newbies prepare and gain helpful tips for open water swimming and race day strategies. For those with experience, just swim and enjoy! This event is open to all levels and is open to anyone. We offer a special discounted rate if you bundle and purchase the Open Water Swim Clinic Session when you register for the 370 Lakeside Triathlon. Lifeguards and volunteers will be in the water to ensure the safety of the participants, there will also be buoys set up in the water to practice
sighting. After the swim, please stick around for the MSE Lakeside 370 Triathlon Expo.

Make sure to check in at the registration table located on the beach before getting in the water.

PARKING: There is a variety of parking around 370 Lakeside Park. The closest and most advantageous parking is the large parking lot directly next to the 370 Lakeside Corporate Pavilion. Please do not park on any grass areas in the park.


There is NO rain date, We Go Rain or Shine. In case of inclement weather,
management reserves the right to cancel/alter/modify the race/course for safety concerns. In any case there will be No Refunds of race entry fees. Each athlete must accept any such risk of their entry fee paid. There is no complementary race entry to a future race. All monies collected are used to develop and produce the event, including all race supplies, staffing, and administration. We pledge to make every effort to produce a fair, safe, and exciting event for all. Any decision we make to go forth with the
race is based on the overall event safety. We have a strict NO REFUND policy.


There may be a photographer on site capturing pictures of the event. Since this is a public event, we reserve the right to post photos on our social media or agency website. Photos may also be used in promotional materials.

Corporate Pavilion, 370 Lakeside Park

1000 Lakeside Park Drive

Saint Peters, MO 63376

TIME: 12:00pm – 4:00pm

Allow time to visit the MSE Racing 370 Lakeside Triathlon Endurance Expo and enjoy all the park amenities for additional family fun –

  • vendor booths

  • athlete's lounge under the purple tent to participate in some onsite Yoga

  • yard game section

  • food trucks

  • splash pad

  • fishing

  • small playground

  • rentals - kayaks, paddle boards, paddle boats and bikes

ENDURANCE EXPO & Lakeside Park Amenities
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