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Taking on endless happy trails and packed full of everything that makes an ultra great, without the mega distance, the Kosci50 is built around being runnable and achieveable.

Race Category


Running Stones


Finals Access


50.4 KM

Elevation Gain

1802 M+

Start Date

Thursday 7th December 2023

Race Start

Bullocks Flat, Ski Tube Terminal - 06:30

Max Allowed Race Time

13 Hours 30 Minutes



Mixing ski resort vibes, snow gum forest trails and with the epic trail community at its heart – the Kosci50 is equal parts fun, achievable and challenging. It takes everything great about the longer courses – the scenery, happy trails and support – and packages it into a 50km bundle that gives you “I’m an ultra-runner” bragging rights without the crazy KMs.


ENTRY INCLUSIONS Race entry, athlete t-shirt, finisher medal, athlete gift, fully stocked checkpoints, drop bag service, on-course medical support and assistance, course photography (able to purchase during rego).
TRANSPORT Shuttle services will be available to and from start and finish line venues. Details on the Transport & Parking page.
MINIMUM AGE 18 years of age on race day
MANDATORY GEAR All runners must carry mandatory gear during the race. Details are on the Mandatory Gear page.
FIRST FINISHER 3hr 54min (10:24am)
FINAL FINISHER 13hr 30min (8:00pm)
TIMING RESULTS The following age divisions for both male and female will be used for race results (age on race day will be used to determine your age division): 18-19, 20-34, 35-39, 40-44, 45-49, 50-54, 55-59, 60-64, 65-69, 70-74, 75-79, 80-84, 85+
AWARDS & PRIZES 5 fastest male and females receive a trophy.
5 fastest male and females receive free entry to the following year’s event.
Trophies will be awarded to 1st in each division.
UTMB World Series ws50KM
The Kosci50 is a UTMB World Series 50K Event. Finishers of Kosci50 will receive 2 running stones.


Picture 50km of trail running heaven, and you’ll have a pretty good idea of what’s in store for the Kosci50. Kicking things off at the Bullocks Flat Ski Tube Terminal, it won't take long before you hit the good stuff - single-track.

The sound of trickling water will accompany you along the next parts of the route as you follow the Thredbo River along the Thredbo Valley Trail, making your way deeper into the mountains towards the Thredbo Ski Village. You’ll wind your way beneath chairlifts and amongst ski routes, ascending the mountain before flying down flowy MTB single track – the stuff dreams are made of…

With around 1800m of climbing the Kosci50 isn’t a grunt, but a nice mix of up and downhill on runnable trails that make the most of the views, the alpine air and the happy trails. Perfect for first-time ultra-runners or those looking for a great “experience to KM” ratio.

*Maps subject to change, and may changes for reasons outside of the Race Organisers control. Select the Time Charts tabs to view the cut-off times for leaving the relevant checkpoint. Time Charts show estimated fastest and slowest times for each race leg and should be used as a guide only. Where the slowest times are greater than the cut-off time, the cut-off time will supersed the sloest expected estimates. If you miss the cut-off then you must follow the directions of officials. Please note that in bad weather conditions, cut-offs may need to be brought forward during the event.

Open Kosci50 course in Capra


All the information you need to know before starting an extraordinary adventure.


The Kosci50 has 3 checkpoints along its route, with differing levels of service and supplies. The Kosci50 checkpoints offer you the opportunity to refuel, rehydrate, see your spectators and prepare for the next leg of your journey!
Read more about checkpoints


A drop bag service will be available which allows you to have your own personal supplies (gels, food, change of socks, shoes, shorts, lubricant, etc.) available at the finish.
Read the rules on drop bags


Every runner at Kosci will have to carry mandatory gear. The mandatory gear list contains what we believe is the absolute minimum to keep you safe during the event and in the Snowy Mountain’s unpredictable weather systems.
Read Mandatory Gear rules


The Kosci50 course is publically accessible throughout the year, offering the opportunity to train on course prior to raceday. However note that many sections are covered in snow in the colder months.

Please take care and give way to members of the general public when training on course.
Read about Training & Nutrition



The Kosci50 will start in 3 waves 5 minutes apart. These waves are self-seeded on race morning.

  • Wave 1 - expected finish time between 3:30 and 6:45
  • Wave 2 - expected finish time between 6:45 and 8:30
  • Wave 3 - expected finish time between 8:30 and 13:30

Please join the wave that best fits you, and follow signage and direction of staff on race morning.


We encourage spectators to get out on course and support their runners!

Spectators can see runners at many points along the Ultra-Trail Kosciuszko by UTMB courses. We ask that you please respect private landowners and do not cross any private property. If spectating on course, please respect runners and support crews and do your best to spectate in a supportive, safe manner. Any on course spectating (including at checkpoints) can only be moral support – no material or physical supporting is allowed for the Kosci50.

We ask spectators at Ngarigo Campground when supporting your Kosci50 runners - due to very limited parking at this location, please park responsibly and do not impede traffic or runners. We encourage you to support your runners at the start line, in and around the trails near Bullocks Flat Ski Tube Terminal, and at Eagles Nest Checkpoint.

For more helpful information please visit the Transport & Parking page and Spectators page.