Online registrations are now closed. Registrations are still available at the expo as well race morning.

If it is Thursday race week in KONA, it's the UNDERPANTS run! The tradition continues in its 21st Year. A small donation of $25 will get you your choice of UNDERPANTS run merchandise. Donations help to support local charities.

START your registration process by choosing one item to the right that is included with your registration. Additional items can be purchased at the end of the registration process.

THE COURSE - 1.5 miles/ 2.4 km total. Starting and finishing at the Courtyard King Kamehameha’s Kona Beach Hotel, in the parking lot where the IRONMAN Banquets take place and then running out onto the pier, south along Ali’i Drive with a turnaround through Uncle Billy’s.

Click here to view map >>

PACKET PICKUP - Early pick up of product:

• Tuesday, October 9th at the Multisports.com booth in the IRONMAN expo from 12pm-7pm and then all day in the expo from

• Wednesday, October 10th - 9am-4pm

• Thursday morning October 12th starting at 6am - at the Courtyard by Marriott King Kamehameha’s Kona Beach Hotel parking lot where the event starts and finishes.