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Ultra-Trail Kosciuszko by UTMB Thredbo, New South Wales, Australia

Name: Ultra-Trail Kosciuszko by UTMB
Start: 2026-11-26
End: 2026-11-27

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Ultra-Trail Kosciuszko by UTMB

Course maps

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Kosci30
Kosci50
Kosci100
KosciMiler

Foot race | 26 Nov 2026

20.5 mi

Distance

Elevation gain

5,988 ft

Elevation high

4,541 ft

Elevation avg

Trail/Dirt

Elevation loss

3,684 ft

Elevation low

Climb factor

What is climb factor?

The climb factor for a course is the percentage of your energy used in hill-climbing compared to the energy expended running the flats.

This course has a climb factor of 8% over 20.5 mi, which means that the energy expenditure for the run is equivalent to running a flat 22.1 mi.

Climb factor is provided courtesy of Ben Crowell, who both authored climb factor's scientific paper and wrote the open source software for it. You can read more about it here .

Course last updated 10 Oct 2026

All values approximate

Distance & elevation data

The distance or elevation data not precisely what you expect for this route?

Data from a GPS device can be rough, especially in areas where the terrain (trees, canyons) interfere with GPS signals. And routes drawn on our maps are reliant on people marking trails from satellite images -- the details of which can be hidden by trees.

Elevation can be tricky too. Elevation data is stored on spaced topographical lines, and determining the elevation of a point requires computers to estimate based on how close the point is to the topographical line.

We mitigate this by calculating distance in 3-D (think Pythagorean theorem) and using mathematical techiniques to smooth the elevation data. We come close, but no one can be perfect with imperfect data, even in 2026.

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Stats summary

Race distance	Distance	Ele gain	Ele loss	Ele avg	Paved	Gravel	Dirt	Narrow
Kosci30	20.5 mi	2,201 ft	3,330 ft	4,541 ft	7%	41%	53%	88%
Kosci50	31.2 mi	4,921 ft	6,047 ft	4,797 ft	11%	40%	50%	71%
Kosci100	65.5 mi	10,354 ft	11,490 ft	5,427 ft	15%	48%	36%	75%
KosciMiler	99.5 mi	16,916 ft	15,381 ft	4,911 ft	15%	52%	34%	74%