Trail Running · Kranjska Gora

🇸🇮Julian Alps Trail Run by UTMB 120 km:
Course Analysis & Race Readiness

123 km through the mountains with 5,666 m of climbing and 5,345 m of descent across 18 climbs and 17 descents. A relentless ultra where downhill volume and accumulated fatigue decide the day.

CourseRecon scores your own training against the descending and durability demands that define Julian Alps Trail Run by UTMB 120 km — the sample analysis below shows exactly how.

123 km

Distance

+5,620 m

Vertical Gain

−5,300 m

Total Descent

Sep 18, 2026

Next Edition · 58 days out

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The Course · GPS-Measured

What 123 km / 76.3 mi and 5,620 m / 18,430 ft of vertical gain actually look like

Measured from the GPS track: 123 km / 76.3 mi and 5,620 m / 18,430 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

123km

Distance

+5,670m

Gain

−0.0 km−50 m

GPS-Measured

123km

Distance

+5,620m

Gain

Climb & Gradient

+5,620 mTotal Gain

−5,300 mTotal Loss

Gradient Distribution

30%

Flat

≤3% grade

26%

Run-Climb

3–15% up

10%

Steep Climb

>15% up

34%

Descent

downhill

Steepest Sustained Sections

Climb

KM 69.7–72.6 · +609 m

+20.4%

Climb

KM 73.3–76.4 · +568 m

+18.8%

Climb

KM 88.4–90.6 · +382 m

+17.2%

Descent

KM 94.3–96.8 · −398 m

-16.3%

Finish & Cutoff Times

What it takes to finish

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

13h 58m

Winning time

31h 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. Descending carries 43% 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-length effort spanning 123 km from 493 m to a 2,162 m high point.

ClimbingVertical power

20%

Eighteen climbs totaling 5,666 m, including sustained pitches over 18–20% grade.

DescendingEccentric / braking

43%

5,345 m of loss across 17 descents; 38% of the course runs downhill.

DurabilityLate-race resilience

37%

Legs must absorb heavy descent volume and back-to-back steep climbs deep into the race.

The Profile in One Line

A 123 km ultra stacking heavy descent load and repeated steep climbs over 5,666 m of total gain.

Aerobic FoundationalClimbing 20%Descending 43%Durability 37%

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

READY

For a representative strong mountain-ultra athlete

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

Pillar Breakdown

Aerobic

At 123 km with 5,666 m of gain, the course demands a deep, well-managed aerobic base to hold effort across an ultra-duration day.

Climbing

With 18 climbs and 5,666 m of ascent, including a 7.7 km longest climb and a 698 m biggest gain, sustained uphill power is essential; 21% of the course exceeds 10% grade.

Descending

5,345 m of loss over 17 descents makes downhill the dominant demand at 38% of the course, with the longest descent 6.4 km and steepest pitches near -16%.

Durability

The heaviest climbing clusters near km 70–96, with pitches of 20.4%, 18.8% and 17.2% arriving late, so quads and pacing must survive well past halfway.

km 69–76

The Steep Double Climb

Back-to-back climbs of 609 m at 20.4% and 568 m at 18.8% land past halfway, the steepest sustained work on the course. Reaching this fresh enough to keep climbing is decisive.

km 88–97

Late Climb-and-Plunge

A 382 m climb at 17.2% is followed by a 398 m descent at -16.3%, hammering already-fatigued legs. Descending control here separates strong finishes from blow-ups.

Whole course

Descent Load

5,345 m of loss across 17 descents means 38% of the race is downhill, the single largest demand. Trained eccentric strength is required to avoid quad failure over 123 km.

That was a sample