Bighorn 100 — 2027 — Course Map, Elevation Profile & Aid Stations

Course map, elevation profile & surface

Distance

99.4mi

Elev gain

20,526ft

Elev loss

20,712ft

High point

8,998ft

Low point

3,902ft

Effective oxygen

71–87%of sea level

Drawing the course…

The course file didn’t load.Usually a hiccup. The stats above are still right.

Race-day light

In the dark

32%

Sunrise

5:23am

Sunset

8:59pm

Headlamp from

64mi

For a 22:30 finish (an estimate) · starting 7:00 AM Jun 18 · headlamp mi 64–96. Dark means the sun below civil twilight.

Climbs

15 climbs · 14,353 ft totalbiggest first

Pick a climb to find it on the profile and the map.

Elevation gain, measured two ways

Source	Gain	vs lidar
Course file (GPX)	20,526ft	+22%
USGS lidar, 1 m	16,786ft	reference

They differ because a GPS file picks up noise on every wiggle and often takes its heights from a coarse terrain model, while lidar maps the ground itself to about a metre. We sampled this route every 98 ft against USGS 3DEP and counted each rise of 10 ft or more, on Nov 1, 2026. The planner still uses the course file.

Conditions typical race-day weather for Jun 18 at the start

Typical high

70°F

Typical low

51°F

Chance of rain

47%

2025 high

78°F

Typical = the median of 2016–2025 for Jun 18 ±3 days at the start line; a wet day has 1 mm of rain or more. Historical weather from Open-Meteo.

Race almanac 2 years of this race

Past editions

Race-day highs at the start ran from 70° to 81°F, and none of 2 race days was wet.

Year	Start °F	Rain	Wind	Heat index
2026 Jun 19	70°/49°	dry	8mph	—
2025 Jun 20	81°/61°	0.02in	11mph	81°

Next race day Fri, Jun 18, 2027 · 7:00 AM start

First lightsunrise 5:23 am

4:46am

Last lightsunset 8:59 pm

9:36pm

Moonfull moon, up all night

100% lit

First and last light are civil twilight, the sun 6° below the horizon. The moon is lit as at midnight after the start; headlamp hours count a typical finish from the start while the sun is below civil twilight. Worked out for the start line.

race-day weather from the Open-Meteo historical archive (ERA5) at the start line.

Reviews what runners who have been there say

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About this course

Bighorn 100 — 2027 covers 99.4 mi (159.9 km) with 20,526 ft of elevation gain. That is about 207 ft per mile of climbing, and 20,712 ft of descent. The course tops out at 8,998 ft and bottoms out at 3,902 ft. The profile has 15 sustained climbs; the biggest is the climb from mi 32.0, +3,848 ft over 14.2 mi at 5.2% on average (steepest stretch 19%). Race day is June 18, 2027, starting at 7:00 AM; the sun rises at 5:23 AM and sets at 8:59 PM. Typical race-day weather at the start: a high of 70°F and a low of 51°F, with a 47% 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.

Load the course in the TrailGoat Run Planner for grade-adjusted pacing, climb-by-climb splits, hourly weather and a full hydration & fueling plan — free, no account needed.

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