Online Only – Registration for the 2021 Polson Triathlon is now closed:

No race day registration.

If you have any questions or concerns, contact race director Matt Seeley at or 406-871-0216.

2021 Entry Fees, Dates, and Refund Percentages:

Registration Dates Solo Fee Team Fee Refund

Early Bird

June 1 through June 15





June 16 – July 31





Aug 1 – Aug 17





  • FIELD LIMIT – To help with planning and organization for a quality event, we will limit the field to 200 racers so don’t wait too long to sign up.
  • DEADLINE – Last chance to register online is 11:00 pm on Tuesday, August 17 and there is no race day registration at the event.  Please get signed up before the deadline.
  • REFUNDS – The refund percentages are determined by the date at which you request the refund, not your original registration date.
  • TEAMS – Team entries are welcome in the race and team members will each receive race clothing and other goodies, but we will only be giving competitive awards and recognition to the top three fastest teams overall.