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Your team of four has just 30 hours to cover a 100km course that climbs more than Ben Nevis and Snowdon put together.
Trailtrekker is probably the toughest - and most incredible - challenge you'll ever take on, but you'll be achieving something astonishing for a great cause, and it'll be worth every step.
Entries are open, so you can enter your team right now or register your interest and get some more information about the challenge.
Register for Trailtrekker updates
We've put together some answers to the Trailtrekker questions we hear the most.
Frequently asked questions
Trailtrekker is the Yorkshire Dales endurance challenge of a lifetime and will test you to the limit.
More about Trailtrekker
Find out more about the kind of support you'll get from Oxfam before, during and after the event.
What you'll get
Want to know how you're helping people? Your fundraising means we can reach even more people who are living in poverty around the world.
How you're helping change lives globally
All you need is a team of four, a commitment to raise money... and the physical and mental determination to meet the challenge of a lifetime.
Sign up for Trailtrekker
We know that fundraising can be a tough part of your 100KM challenge, especially on top of the training you will be doing. We want to make fundraising as easy and as fun as possible.
Marketing Executive 100KM Team
Welcome to the 100km events blog! Here we'll be talking everything Trailwalker and Trailtrekker, from training tips to event weekend round-ups. Great to have you aboard, and here's our kick off post:
100km Events Marketing Executive
Been a Trailtrekker for years or taking part for the first time? Visit our Facebook group for top tips (and pictures of people's feet).
Trailtrekker Facebook group
© 2014. Oxfam is a registered charity in England and Wales (no 202918) and Scotland (SC039042).
Oxfam GB is a member of the international confederation Oxfam.