Rat Race 100 - Glamis Castle to Edinburgh Castle

The Rat Race 100 Series is the UK’s most inclusive and accessible 100-mile ultramarathon series, built for people who never thought they could complete a 100 miler. Whether you choose to run, walk or mix the two, our three fully supported 100-mile endurance events are designed to help everyday adventurers achieve an extraordinary bucket-list finish line. With no qualifying times, walker-friendly cut-offs, fully waymarked routes, stocked pit stops and unmatched on-course support, this is ultra running without barriers. 

Journey between some of the UK’s most iconic castles and historic landscapes as each event delivers a spectacular point-to-point adventure packed with unforgettable scenery and inspiring finish lines.