Under the Moon

AUG
1
2026
A self supported road race on Saddle Road from Hilo to Waimea offering 100K, 50K and 25K options with significant elevation change; reflective apparel and lights are required and crews must pull off the road.
Sat 1 Aug 2026
100 kilometers 50 kilometers 25 kilometers

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Under the Moon

Under the Moon is a road running event in Hilo, Hawaii, with multiple distance options. The event uses a point-to-point route along Saddle Road from Hilo to Waimea and is run entirely on pavement.

Distances

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

Course details include significant elevation change. The 100K route has approximately 7,500 feet of climbing and 5,000 feet of descent, with most climbing in the first half. The 50K has about 700 feet of climb and 5,000 feet of descent. The 25K features nearly 3,000 feet of descent.

Support and logistics are runner centered. This is a self-supported event: participants must provide their own water and food drops or arrange crew to meet them on course. Crews and relay exchanges must pull completely off the roadway when meeting runners. Runners are responsible for removing their supplies and trash after finishing and for arranging return travel from Waimea or the Mauna Kea Access Road intersection.

Safety and timing notes: reflective apparel and lights are required for all runners. Temperatures may range from the low 40s with wind and rain to the mid 80s. Cutoff rules include a 19 hour overall limit for the 100K and a requirement to reach the top of Saddle Road by the Mauna Kea Recreation area within 10 hours. There is a 12pm cutoff for the 50K and 25K and early starts can be arranged. 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
25 K
25 km
25k Relay
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