Trail Running · Otago

🇳🇿Northburn 50 km:
Course Analysis & Race Readiness

A 50 km mountain course with 2690 m of gain and 2682 m of loss across six climbs and six descents. Over a third of it climbs above 10%, and nearly a third points downhill.

CourseRecon scores your own training against the descending and durability demands that define Northburn 50 km — the sample analysis below shows exactly how.

50.0 km

Distance

+2,620 m

Vertical Gain

−2,610 m

Total Descent

Mar 20, 2027

Next Edition · 241 days out

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The Course · GPS-Measured

What 51.7 km / 32.1 mi and 2,620 m / 8,600 ft of vertical gain actually look like

Measured from the GPS track: 51.7 km / 32.1 mi and 2,620 m / 8,600 ft of vertical gain. This is the terrain you're signing up for: read it before it reads you.

Course Profile

Segments

Daylight

Terrain summary

Claimed vs GPS-Measured

Claimed · Organizer

50.0km

Distance

+2,600m

Gain

+1.7 km+20 m

GPS-Measured

51.7km

Distance

+2,620m

Gain

Climb & Gradient

+2,620 mTotal Gain

−2,610 mTotal Loss

Gradient Distribution

18%

Flat

≤3% grade

30%

Run-Climb

3–15% up

11%

Steep Climb

>15% up

41%

Descent

downhill

Steepest Sustained Sections

Descent

KM 42.2–44.4 · −287 m

-13.3%

Descent

KM 28.2–38.8 · −1,280 m

-12.1%

Climb

KM 22.8–25.1 · +271 m

+11.9%

Climb

KM 38.8–42.2 · +319 m

+9.4%

Finish & Cutoff Times

What it takes to finish

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

5h 28m

Winning time

6h 33m

Top 5

7h 00m

Top 10

8h 31m

Median finisher

11h 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 51% 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 output over 50 km with 2690 m of vertical gain, no long flat recovery.

ClimbingVertical power

21%

Repeated steep gradients, including a 14.2 km, 1322 m ascent above 10%.

DescendingEccentric / braking

51%

Prolonged, steep braking loads on a 10.6 km, 1280 m descent averaging over 12%.

DurabilityLate-race resilience

28%

Legs must survive 2682 m of loss late, after the biggest climb and drop stack up.

The Profile in One Line

Fifty kilometers of relentless up and down, defined by one 1322 m climb and a punishing 1280 m descent.

Aerobic FoundationalClimbing 21%Descending 51%Durability 28%

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

With 2690 m of gain over 50 km and only 10% flat terrain, the engine works continuously across a long day of climbing and hard descending.

Climbing

Six climbs totaling 2690 m, headlined by a 14.2 km, 1322 m ascent, demand efficient uphill economy on very steep grades where 22% of the course exceeds the steepest bracket.

Descending

The dominant demand: 31% of the course points downhill, including a 10.6 km, 1280 m descent at -12.1% and a late -13.3% pitch, loading the quads with sustained eccentric braking.

Durability

The heaviest climb and descent fall in the second half, so muscular resilience must hold through the 1280 m drop from km 28 to 38 and the final steep descents near km 44.

km 14.2 / 1322 m

The Big Ascent

The longest climb runs 14.2 km and gains 1322 m to the 1677 m high point, much of it above 10%. Pacing this without overspending sets up the rest of the day.

km 28–39 / -1280 m

The Long Descent

A 10.6 km, 1280 m descent averaging -12.1% pounds the legs after the big climb. Controlling this brake-heavy stretch protects the quads for what remains.

km 38–44

Sting in the Tail

After the long descent comes a 319 m climb at 9.4%, then a sharp -287 m descent at -13.3%. Both land on fatigued legs where durability decides the finish.

That was a sample