Rhys grew up in the New Forest, Hampshire, England and was educated at Romsey School and Barton Peveril Sixth Form College. He started climbing as a result of hearing a talk at a Scout meeting. The talk was by Russell Parke MBE, the then leader of Hampshire Scout Expeditions, the subject was Mount Everest. Parkes talked about recruiting a Scout for an attempt on Mount Everest in 2007, to celebrate the centenary of the Scout movement. Jones went on to join the Hampshire Scout Expeditions team (HSX) and began training. His training with HSX included Scottish winter climbing, rock climbing and hillwalking. He also climbed with HSX on Mount McKinley, Alaska. The team successfully reached the summit and Jones claimed a record as the youngest British summiteer of North America's highest peak.