BIRR Monster Mash Mile Fun Run

BIRR Monster Mash Mile Fun Run takes place in Hilo, Hawaii, on October 31, 2026, with a single 1-mile fun run starting at 9:00 a.m. at Wailoa State Park in downtown Hilo. The event welcomes participants of every age and ability, whether you want to test your speed over the distance or treat it as a relaxed walk. Awards go to the top male and female finishers, to the best costume and to the top stroller participants, and every child takes home a prize. Snacks and water are provided, and entry is free for members and for kids under 12.

A road mile is short enough that almost anyone can finish it, but it rewards a proper warm-up: ten easy minutes of jogging and a few strides before the start make a real difference if you plan to race it. Runners chasing a fast time can keep the preceding week light, while families and costumed walkers can simply show up and enjoy the morning.