The club was formed in 1924 as the Old Caldeians Rugby Club for past pupils of Calday Grange School. The first pitch was on a field at Caldy Crossroads and the players changed in the Barn across the road at Croxtons Farm. In 1928 Sir Alfred Paton, a benefactor of the School gifted Thurstaston Hill to the National Trust, with the proviso that the Rugby Club would have a pitch in perpetuity and the rest of the 20 acres to be used for the benefit of the youth of the area. The original pavilion was built in 1928 and is still the wooden core of the current building today.
The first pitch was levelled by the members in the 1930’s when volunteers slept in the clubhouse and in tents for the summer, and a trench for the electric cabling was dug by the boys from the school who were in detention. Much of the funds for the clubhouse were raised by donations and bazaars organised by the members and the school.
In 1951 Hoylake Cricket Club moved to Paton field as tenants of the Rugby club and are now an active part of the Caldy Sports Club. In 1967 the club levelled the slope outside the clubhouse to provide a first-class 1st XV pitch at a cost of £7000.
In 1968 the Club went open and became Caldy Rugby Club. The club was an original member of the Giro bank North West league which was the forerunner of National Leagues. It had mixed success and in 1996 it was relegated into level 9 in the League pyramid. A more professional approach was taken; since 1996 the club have won 5 league titles and were runners up twice before being promoted into National 2 West in 2007. Since then, we have been runners up twice to Nuneaton (there was no play off that year due to league restructuring) and in 2012 lost to Richmond in the playoff 20-13 after extra time. In 2017 we finally won the league, after losing the first game, went unbeaten for 28 games which is a club record Winning the title after a dramatic game with Sale 28-26 after being 23-3 down at half time.
After winning the National 2 North we were promoted to National 1 which meant we were in the top 40 clubs in the Country playing such illustrious Clubs as Blackheath, Rosslyn Park, Coventry, and Moseley. In the first season we remained in the league with some notable wins against Fylde, Blackheath, Moseley, and Rosslyn Park. Unfortunately, in the following season we were relegated in the final minute of the final game losing 10-12 to Birmingham. However, the 1st XV showed great resilience and went through the following season unbeaten and secured promotion winning at Preston, unfortunately Covid intervened and prevented them from finishing the programme which would have broken all records for the club and National Leagues and were promoted back to National 1.