Trail Running · Yamanashi

🇯🇵Mt. FUJI 100:
Course Analysis & Race Readiness

A 164 km ultra with 6,035 m of climbing and 5,866 m of descent across 20 climbs and 17 descents. Sustained downhill volume and relentless accumulation define the day more than any single ascent.

CourseRecon scores your own training against the durability and descending demands that define Mt. FUJI 100 — the sample analysis below shows exactly how.

164 km

Distance

+6,000 m

Vertical Gain

−5,830 m

Total Descent

Apr 23, 2027

Next Edition · 275 days out

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The Course · GPS-Measured

What 163 km / 102 mi and 6,000 m / 19,680 ft of vertical gain actually look like

Measured from the GPS track: 163 km / 102 mi and 6,000 m / 19,680 ft of vertical gain. This is the terrain you're signing up for: read it before it reads you.

Course Profile

Terrain summary

Claimed vs GPS-Measured

Claimed · Organizer

164km

Distance

+6,040m

Gain

−0.0 km−40 m

GPS-Measured

163km

Distance

+6,000m

Gain

Climb & Gradient

+6,000 mTotal Gain

−5,830 mTotal Loss

Gradient Distribution

45%

Flat

≤3% grade

20%

Run-Climb

3–15% up

Steep Climb

>15% up

28%

Descent

downhill

Steepest Sustained Sections

ClimbCRUX

KM 30.8–34.7 · +824 m

+21.4%

Climb

KM 149.0–153.0 · +633 m

+15.9%

Climb

KM 61.3–63.4 · +323 m

+15.8%

Descent

KM 85.5–89.5 · −470 m

-11.6%

Finish & Cutoff Times

What it takes to finish

Reference finish times from past results — use them to set a realistic goal pace.

17h 49m

Winning time

45h 30m

Back of pack

What This Race Demands

Four things this course asks of your body

Every course weights the four pillars of mountain-ultra fitness differently. Durability carries 42% of the scoring weight on this course — the terrain makes that the deciding factor.

Weighting shows where readiness is won or lost at this distance — not whether you need each pillar. An aerobic base is a given for a race this long, so it carries little deciding weight even though it's essential — the gaps open on the climbs, descents and the back half.

AerobicSustained engine

Foundational

Sustained ultra-distance effort across 164 km demanding steady, all-day energy management.

ClimbingVertical power

18%

20 climbs totaling 6,035 m, including a 824 m ascent and long grinding pitches.

DescendingEccentric / braking

39%

5,866 m of loss over 17 descents, with a 11 km descent and steep, repeated pounding.

DurabilityLate-race resilience

42%

Repeated climb-descent cycles over 164 km stress musculoskeletal resilience late in the race.

The Profile in One Line

164 km of rolling accumulation where descending volume and durability outweigh raw climbing.

Aerobic FoundationalClimbing 18%Descending 39%Durability 42%

Here's how CourseRecon reads a course and an athlete

Sample Readiness Analysis

What a readiness result looks like for this course

This is a worked example for a representative strong mountain-ultra athlete — not your score. Connect your own training and the same analysis runs on you.

Sample

OUT OF 100

MOSTLY READY

For a representative strong mountain-ultra athlete

This is a sample — connect your Strava to see your own result.

Pillar Breakdown

Aerobic

The 164 km distance requires a durable aerobic base that holds pace across an all-day effort. Energy must be metered from the start to survive the full duration.

Climbing

With 6,035 m of gain across 20 climbs, including the 824 m crux and a 633 m late ascent, the course demands both power for steep pitches and patience for long grinds.

Descending

5,866 m of loss across 17 descents, including an 11 km stretch and a 939 m drop, tests eccentric control and foot speed. Steep and very-steep descents make up over 17% of the course.

Durability

The highest-weighted demand: 20 climbs and 17 descents interleaved over 164 km grind down the legs. Holding form on the 633 m climb near km 149 hinges on preserved durability.

km 31–35

The 824 m Climb

The course's biggest ascent gains 824 m over 3.85 km at 21.4% average grade. Overspending here compromises the many climbs and descents still ahead.

km 149–153

Late 633 m Ascent

Deep into the race, a 633 m climb at 15.9% over roughly 4 km arrives when legs are already worn. Preserved durability decides whether it can be climbed strong.

km 85–90

470 m Descent

A 470 m drop at -11.6% over 4 km pounds fatigued quads mid-race. Controlled descending here protects the legs for the final third.

That was a sample