The half-distance version of the old IRONMAN UK course — hilly, hard and famous for its crowds.
1.9 km swim in the cool Pennington Flash lake, wetsuit mandatory.
Hilly one-lap bike over the West Pennine Moors including the famous Sheephouse Lane climb.
Undulating run into Bolton town centre with a hard climb and legendary local support.
Actual monthly averages from the last 3 years (Open-Meteo). Real race day may vary.
Water temp uses athlete-reported values first, then official race data, then the marine archive (sea swims, measured at the nearest offshore point). Values tagged est. are modelled from recent air temperature for lakes and rivers, where no observational data exists.
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