The Brutal Extreme Triathlons
September 19th - 22nd, 2026
Llanberis, North Wales
Take on one of the World’s Toughest Triathlons… The Brutal Extreme Triathlons start in the beautiful Lake Padarn. The bike course goes through stunning scenery and over some challenging hills. And finally, the run takes you on an undulating trail around the lake and up and down Wales's highest mountain, Yr Wyddfa (Snowdon).
This is 'The World's Toughest Triathlon' (as voted for by 220 Triathlon in 2017) but it is renowned for its low-key and friendly vibe. Every athlete, whether it's your first triathlon or 21st, will feel the massive support from not only the event crew, but the other competitors too. The challenging terrain and breathtaking scenery creates an awesome experience that will stay with you long after the aches and blisters have gone!
The distances available are Half, Full, Double, Triple and you can enter all of these events as a solo or in a team (2 - 4 members).
A note on support crews: You ONLY need support crews for the double or triple races. Please read the detailed section below about support crews.
Pick your distance
- Canol (Half/middle): 1.2 mile lake swim (2 laps) in Llyn Padarn. Followed by 56 miles (2 laps) on the bike. Finally, you run 1 Lake Lap (5 miles) and then take on Yr Wyddfa (Snowdon).
- Mawr (Full/big): 2.4 miles lake swim (4 laps) in Llyn Padarn. Followed by 112 miles (4 laps) on the bike. Finally, you run 3 Lake Laps (15 miles) and then take on Yr Wyddfa (Snowdon).
- Cawr or Goron (Double/Triple): Are you ready for the big boys of ultra, extreme triathlon?! See below for laps and distances for the Ultra distance events.
Info pack | Download GPX files | Watch all the Brutal films here
Entry fees:
Cut offs:
- Brutal Bach (Standard): Exit the water - 45 minutes after start of race. Exit transition from bike to mountain section - 4 hours after start of race. Overall cut off - 8 hours after start of race.
- Brutal Canol (Half Brutal): Exit the water - 1 hour after start of race. Exit transition from bike to run - 6 hours after start of race. Exit transition from lake lap to start mountain section - 9 hours after start of race. Overall cut off - 12 hours after start of race.
- Brutal Mawr (Full Brutal): Exit the water - 2 hours after start of race. Exit transition from bike to run - 12 hours after start of race. Exit transition from lake lap to start mountain section - 18 hours after start of race. Overall cut off - 21 hours after start of race.
- Brutal Cawr (Double Brutal): Exit the water - 4 hours after start of race. Exit transition from bike to run - 26 hours after start of race. Overall cut off - 42 hours after start of race.
- Brutal Goron (Triple Brutal): Exit the water - 6 hours after start of race. Exit transition from bike to run - 38 hours after start of race. Overall cut off - 64 hours after start of race.
Course information
Swim
The swim is held in Llyn Padarn which is based in