The club was formed in 1968 when Peterswell and Kilchreest amalgamated. Peterswell had enjoyed early success in the late 1800s and early 1900 with them winning the
Galway Senior Hurling Championship title in 1889, 1898, 1899, 1900, 1904, 1905 and 1907. They were a major force in
Galway GAA throughout this period. The club name derives from
Thomas the Apostle, to whom the
Catholic church in Peterswell is dedicated. Both adjoining parishes were associated with hurling since its foundation but due to emigration and lack of numbers the parishes decided to amalgamate. The first year in competitive hurling was a successful one. The under-14 team brought the club its first success by winning the county title. The team would follow this up by winning the county under-16 title in 1970. Construction began on their current clubhouse which is located on the main Gort to Loughrea Road in 1976. That along with a brand new pitch were finally officially opened in 1983 by
Paddy Buggy, President of the GAA. In 1978 another milestone was reached when the club was promoted to senior ranks after reaching the county intermediate final, however they were defeated by close neighbours Kilbeacanty. Following the promotion to senior ranks the club endured a chequered existence in senior hurling. Having been relegated on a number of occasions they secured promotion with Intermediate Championship victories in 1996 and 2004. They were crowned Galway Senior Champions for the first time in 2012 by defeating
Loughrea in the final on a scoreline of 3–11 to 2–11 in Pearse Stadium. They followed this up by taking the
All-Ireland Senior Club Hurling Championship by defeating
Kilcormac-Killoughy on St Patrick's Day. In 2016, the secured a second
Galway Senior Hurling Championship by beating Gort in the final on a scoreline of 1–11 0–10. ==2013 All Ireland victory==