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Under the Moon 100K — 2026Trail race course58.9mi7,304ftAug 1

Under the Moon 100K — 2026

Race day · Aug 1, 2026 · by Hawaii Mountain Running

Race almanac: 1 year of race-day weather
Plan this race
Course map, elevation profile & surface
Distance
58.9mi
Elev gain
7,304ft
Elev loss
4,762ft
High point
6,766ft
Low point
79ft
Effective oxygen
78–100%of sea level
Drawing the course…

Race-day light

In the dark
2%
Sunrise
5:57am
Sunset
6:58pm
Headlamp from
57mi

For a 12:40 finish (an estimate) · starting 7:00 AM Aug 1 · headlamp mi 57–the finish. Dark means the sun below civil twilight.

Climbs

2 climbs · 6,921 ft totalbiggest first
Pick a climb to find it on the profile and the map.
Conditions typical race-day weather for Aug 1 at the start
Typical high
80°F
Typical low
70°F
Chance of rain
87%
2025 high
82°F

Typical = the median of 2016–2025 for Aug 1 ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.

Race almanac 1 year of this race

Past editions

On race day it reached 81°F at the start, with a low of 69°.

YearStart °FHigh point °FRainWindHeat index
2026 Aug 181°/69°74°/53°0.14in9mph83°

race-day weather from the Open-Meteo historical archive (ERA5) at the start line and the course high point (6,765 ft).

Reviews what runners who have been there say

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About this course

Under the Moon 100K — 2026 covers 58.9 mi (94.8 km) with 7,304 ft of elevation gain. That is about 124 ft per mile of climbing, and 4,762 ft of descent. The course tops out at 6,766 ft and bottoms out at 79 ft. The profile has 2 sustained climbs; the biggest is the climb from mi 0.2, +6,687 ft over 31.1 mi at 4.1% on average (steepest stretch 13%). Race day is August 1, 2026, starting at 7:00 AM; the sun rises at 5:57 AM and sets at 6:58 PM. Typical race-day weather at the start: a high of 80°F and a low of 70°F, with a 87% chance of a wet day. The interactive map above shows the full route with its elevation profile and aid stations, built from the course's GPS file.

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Course history

  1. Oct 13, 2026Added to the catalog
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