The Beastie
750m swim17km MTB5km run
The full off-road challenge: a loch swim, three big bike laps and two run laps to the castle.
Loch Lomond’s off-road classic
Meet the
Beastie.
A wild swim. A muddy ride. A hard-earned finish in front of Balloch Castle. Choose your challenge and smile at the marshals.
See the 2026 galleryLast raced25July 2026
Balloch Castle Country Park
Three ways to face the Beastie.
Set on the banks of Loch Lomond, the three events cover experienced athletes, first-timers and anyone who would rather leave the bike at home.
Wee Beastie
400m swim9km MTB3km run
A shorter course and a good first open-water triathlon. The name says wee; the finish still has to be earned.
Bikeless Beastie
750m swim— bike5km run
All the loch and trail energy without the bike: one swim followed by two run laps.
Know before you go: the Beastie bike courses require mountain bikes. Wetsuit rules depend on water temperature and British Triathlon regulations. Event details can change each year.
Read the event informationPhotos & results
The Beastie archive.
Browse Daren Borzynski’s Flickr galleries, then find the available timing record for each event.
202625 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park202526 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park202427 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park202316 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park202230 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park201927 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park201828 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park201729 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country Park201630 Jul
Loch Lomond Beastie Triathlons
Balloch Castle Country ParkPhoto gallery Results not available online