What is the cost to participate?

The race is free for Big Island Road Runners (BIRR) members and children 12 and under, while non-members are asked for a $10 donation.

Are there awards for the race?

Yes, awards are given to the top three male and female finishers in the mile, the best male and female costumes, and the top male and female stroller participants. All children receive a prize for completing the kids' race.

Where exactly in the park does the race start?

The event is hosted at Pavilion 2 within Wailoa State Park.

All races

3 weeks out

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All races

3 weeks out

BIRR Monster Mash Mile Fun Run

Saturday, October 31, 2026Hilo, HI1 Miles

Celebrate Halloween with a festive morning at the second annual Monster Mash Mile in Downtown Hilo. This community-focused event invites runners of all speeds to test their pace or enjoy a casual stroll through the scenic Wailoa State Park. Participants are encouraged to wear their best costumes to add to the holiday spirit. The event features a competitive one-mile run followed by a shorter 400-yard dash for children. With awards for top finishers, best costumes, and even stroller categories, it is a fun-filled morning for the whole family. Refreshments including snacks and water will be provided to all participants after the race.