6,000
people have taken on the Kosi Challenge since the inaugural event in 2013.
More than $6 million
has been raised to support people diagnosed with rare and less common cancers.
22,000 kms
climbed in 2026 for Australians impacted by rare and less common cancers.
What is the Kosi Challenge?
The Kosi Challenge is Rare Cancers Australia’s (RCA) major fundraising event, held in March each year since 2013.
It sees people unite from across Australia, including patients and families, to climb to our country's highest point, the summit of Mount Kosciuszko to raise much needed funds and awareness for people in Australia affected by rare and less common cancers.
No one in Australia should have to go through their cancer journey alone. That is why we walk the journey with those impacted.
Take on the challenge for Australia's forgotten patients
The Kosi Challenge has now grown to run over two huge days. You can choose to climb on either Friday 19 or Saturday 20 March 2027.
Attend In-person
Encourage your family, friends, and colleagues to register a team, raise vital funds and awareness for rare cancers, and make it a weekend to remember!
Challenge yourself virtually
Can’t make it to Thredbo? You can still show your support and take on the challenge beyond the mountain – by walking or running 21km wherever suits you on the Kosi Challenge weekend.
$178
Help us to reach our $750,000 goal
Joan Williamson just donated $11.07
Kristen Edwards just donated $50.00- Bruce Annabel just donated $60.06
Laura Cohalan just donated $55.95
Danika Pearse just donated $1.00
Leaderboards
All
Top Fundraisers
No person should have to go through their cancer journey alone.
That's why we walk with them, and you can too.
In Australia, someone is diagnosed with a rare or less common cancer every 12 minutes.
Diagnosis can be delayed, survival outcomes are poorer, and people with rare or less common cancers can face exorbitant costs for treatments that are not subsidised for their cancer type.
Coupled with a lack of information and support, it can be a very lonely and uncertain journey.
The Kosi Challenge unites a community of support with a common purpose - ensuring nobody has to walk alone.
Top Kosi FAQ’s
How can I participate in the Kosi Challenge?
On the mountain
By joining us on Friday 19 or Saturday 20 March 2027 to climb the iconic Mt Kosciuszko.
Beyond the mountain
By walking or running 21km across the two days of the Kosi Challenge, wherever you are in Australia or around the world!
Along the way, you're encouraged to fundraise as much as possible to help us continue doing whatever it takes for people affected by rare and less common cancers.
When is the event and what time does it start?
The Kosi Challenge is an all-day event on Friday 19 or Saturday 20 March 2027. Groups leave every 15 minutes from 7am to 9.30am each morning. If you plan to take the chairlift, you should choose a start time from 9am onwards.
Due to the high number of participants expected, it is crucial that you arrive 20 minutes prior to your start time to allow for check-in and event briefing.
Please note: A chairlift ticket is included in your registration.
You can also complete your challenge beyond the mountain, on the same dates as the in-person event. You can complete your walk, hike or run at any time during this period, either in one go or broken up across the two days.
What is the difference between the Friday and Saturday events?
Both days follow the same format – challengers begin their staggered starts from Thredbo Alpine Hotel in the morning, descending by early afternoon. After some food to recharge and a shower to refresh, challengers are invited to come together again in the early evening to celebrate the collective difference we’ve made for Australians impacted by rare cancer.
On Friday evening, join us for the Kosi Kick-off in the Kosciuszko Room of the Thredbo Alpine Hotel. Here, you can share your stories from the day's climb, meet some of the Saturday Kosi Challengers, connect with the Rare Cancers Australia team and learn more about the impact of your fundraising.
Stay until Saturday evening for the Kosi Awards Ceremony in the courtyard outside the Thredbo Alpine Hotel. We'll recognise our highest fundraisers, hear from those impacted by your fundraising, remember those we've lost, and enjoy a drink in the company of new friends.
How do I register and when do registrations close?
Please visit the registration page.
Registrations to join us on the mountain close at 12pm on Friday 12 March 2027, unless sold out earlier.
Registrations for the Kosi Challenge beyond the mountain will remain open until Friday 19 March 2027.
What are the costs?
Adults attending on the mountain
Registration: $99.00
Children (under 17) attending on the mountain
Registration $50.00
Registration covers costs such as event insurance, promotion and park fees. You'll also receive a Rare branded cap on the morning of your climb, and have the opportunity to unlock other merchandise rewards as you reach fundraising milestones.
If you drive your car into the National Park you will be required to purchase a Parking Pass. The cost is currently $17.00 per car per day.
Adults and children participating beyond the mountain
FREE
Registration beyond the mountain is free. You'll receive Rare branded merchandise as you reach specified fundraising milestones.
What does my registration fee cover?
The in-person registration fee covers administration costs, event insurance, associated fees and promotion. You will also receive a Rare branded cap on the morning of your climb.
Registration for the Kosi Challenge beyond the mountain is free.
All participants can earn merchandise rewards at specified fundraising milestones.
