Under the Moon

AUG
1
2026
A road endurance event from Hilo to Waimea with 100K, 50K and 25K options plus relays. The fully paved course includes substantial climbing and requires reflective apparel and lights.
Sat 1 Aug 2026
100 kilometers 50 kilometers 25 kilometers

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Under the Moon - Hilo to Waimea, HI

Under the Moon is a road endurance event held in Hilo with multiple distance options and relays. Distances offered include:

  • 100K
  • 100K Relay
  • 50K
  • 50K Relay
  • 25K
  • 25K Relay

The route runs alongside Saddle Road from Hilo to Waimea and is 100% pavement. The 100K route has most of its elevation gain in the first half, with approximately 7,500 feet of climbing and 5,000 feet of descent. The 50K has about 700 feet of climbing and 5,000 feet of descent. The 25K features almost 3,000 feet of descent. The organizer notes the Hilo to Waimea direction retains more climbing than the reverse.

This event is self supported. Runners must provide their own water and food drops or arrange crew support. Crews and relay exchanges must pull fully off the road and shoulder to allow safe passage; failure to do so can disqualify a team. Runners are responsible for removing their supplies and trash after the race and for returning from finish locations such as Waimea or the Mauna Kea access intersection.

Reflective apparel and lights are required for all participants. Temperatures along the route can vary widely, from the low 40s with wind and rain to the mid 80s. Visit the organization's website for the most recent information.

100 km
100k
100 km
100 K Relay
50 km
50 K Relay
50 km
50k
25 km
25k
25 km
25 K Relay
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