Jenkins first played rugby at Long Ashton School, and would later represent local teams Mountain Ash and Newbridge. By 1901 he was playing for first classWelsh team Newport, and turned out for the senior team over six seasons making 61 appearances. During this period Jenkins spent much of his time in England, and became a regular for Welsh exiles team, London Welsh, and also played for Rosslyn Park and Middlesex County rugby team. In 1905, Jenkins faced his forst international opposition, when he was part of the Middlesex team to face the Original All Blacks at Stamford Bridge, during the New Zealanders' first overseas tour. Middlesex lost the game heavily, 34-0. During the 1906/07 season, Jenkins faced the Paul Roos' touring South Africans on three occasions. In the first encounter, Jenkins was playing for Middlesex County, losing 9-0 to the Springboks at Richmond. On 22 November1906, Jenkins turned out for Monmouthshire to face Glamorgan in a Welsh trial for the upcoming international between Wales and South Africa. Four new caps managed to break into the Welsh team, Jenkins, Dick Thomas of Mountain Ash, John Dyke of Penarth and Cardiff'sJohnnie Williams. At the trial, of the new caps, only Williams impressed, none of the other three players showed great ability, but were 'distinctly superior to any of their uncapped rivals'. On 1 December 1906, Jenkins won his one and only cap when he ran out onto St. Helen's in Swansea to face the Sprinkboks. The South Africans won the match comfortably, with much of the blame for the Welsh loss placed on the forward play. Jenkins and Williams were tagged as having 'failed to scummage'. Despite the loss, Jenkins was part of the Monmouthshire County team that faced the same touring South Africans on Boxing Day 1906. Jenkins, along with captain George Travers, was one of only two players with international experience, and the team was further weakened after Newport refused to release their players after an argument over the venue. South Africa out-classed Monmouthshire, winning 17-0, and Jenkins himself gave away the second try after a loose kick. In 1908, Jenkins was invited by fellow London Welsh teammate and friend, Arthur Harding, to join his Anglo-Welsh team on their 1908 tour of New Zealand and Australia. Jenkins was forced to turn down Harding's offer due to personal commitments. Towards the end of his rugby career, Jenkins became much more connected to London Welsh, and in the 1910/11 season was given the club's captaincy. He also played a large role in committee matters, and was Honorary Secretary between 1908 and 1911. In 1911 he was one of three members that wrote the club membership rules, but after returning from active duty in France, Jenkins resigned from the club after discovering that the trustees of the club had sold the freehold to Heathfield Ground on Wandsworth Common, London Welsh's home ground. Although Jenkins severed all ties between himself and the club from 1919, his record at London Welsh remained impressive, spanning 12 years and 200 games.
