370 Lakeside Triathlon

Sun, Aug 23, 2026, 7:30 AM CDT

Location: Saint Peters, MO; 1000 Lakeside Park Drive, 63376
Type: RUN

Official registration Past results (if available)

Vibe analysis coming soon

Course feel, difficulty, and community fit are being added to this listing. Check back, and always confirm details on the official registration page.

Distances & registration

21 options

Registration for all distances is through the official signup link above.

5K
Sun, Aug 23, 7:30 AM CDT · From $33.63
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
SUPER SPRINT INDIVIDUAL TRI
Sun, Aug 23, 6:45 AM CDT · From $124.36
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
SPRINT INDIVIDUAL TRI
Sun, Aug 23, 7:00 AM CDT · From $135.04
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT

+ 18 more options

SPRINT PARA TRI
Sun, Aug 23, 6:45 AM CDT · From $103.01
Opens Sep 8, 2025, 8:03 AM CDT · Closes Aug 16, 2026, 7:59 PM CDT
SPRINT COLLEGIATE TRI
Sun, Aug 23, 7:00 AM CDT · From $81.66
Opens Sep 8, 2025, 8:03 AM CDT · Closes Aug 16, 2026, 7:59 PM CDT
SPRINT HIGH SCHOOL TRI
Sun, Aug 23, 7:00 AM CDT · From $81.66
Opens Sep 8, 2025, 8:03 AM CDT · Closes Aug 16, 2026, 7:59 PM CDT
SPRINT PARA MY TEAM TRIUMPH
Sun, Aug 23, 6:45 AM CDT · From $103.01
Opens Sep 8, 2025, 8:03 AM CDT · Closes Aug 16, 2026, 7:59 PM CDT
SPRINT AQUATHLON
Sun, Aug 23, 7:00 AM CDT · From $124.36
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
SPRINT AQUABIKE
Sun, Aug 23, 7:00 AM CDT · From $124.36
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
SPRINT DUATHLON
Sun, Aug 23, 7:30 AM CDT · From $124.36
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
SPRINT RELAY TRI
Sun, Aug 23, 7:00 AM CDT · From $209.76
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
OLYMPIC INDIVIDUAL TRI
Sun, Aug 23, 7:00 AM CDT · From $145.71
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
OLYMPIC AQUABIKE
Sun, Aug 23, 7:00 AM CDT · From $135.04
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
OLYMPIC DUATHLON
Sun, Aug 23, 7:30 AM CDT · From $135.04
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
OLYMPIC AQUATHLON
Sun, Aug 23, 7:00 AM CDT · From $135.04
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
OLYMPIC RELAY TRI
Sun, Aug 23, 7:00 AM CDT · From $225.78
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
HALF INDIVIDUAL TRI
Sun, Aug 23, 7:00 AM CDT · From $215.10
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
HALF AQUABIKE
Sun, Aug 23, 7:00 AM CDT · From $177.74
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
HALF DUATHLON
Sun, Aug 23, 7:30 AM CDT · From $177.74
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
HALF AQUATHLON
Sun, Aug 23, 7:00 AM CDT · From $177.74
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT
HALF RELAY TRI
Sun, Aug 23, 7:00 AM CDT · From $300.50
Opens Sep 8, 2025, 8:03 AM CDT · Closes Mar 23, 2026, 7:59 PM CDT

Vibe Check

Steady Effort

warm-day exposure

Rolling area
Warm season

Based on terrain, weather, and distance data.

The course

From the organizer

Join us for the 6th annual USAT sanctioned 370 Lakeside Triathlon! Enjoy the flattest, fastest course starting in beautiful 370 Lakeside Park! Enjoy a beach start, amazing country roads in St. Charles County, and a run that includes the park trails. We offer a variety of race options from a 5k run, super sprint or sprint for newbies, up to half distance along with duathlon, aquabike and aquathlon options!

For more information including course maps, schedule of events, race options, volunteer signup, etc. Please visit - https://www.mseracing.com/370-lakeside-triathlon

All athletes MUST show a Photo ID and pick up their own race packet, NO EXCEPTIONS.

370 Lakeside Triathlon

Distances & registration

Vibe Check

The course

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