The origin of the show dates back to the 1790s when Monmouth's agricultural society organised ploughing matches. However it was not until 1857 that it was proposed that a cattle show should be created. On 30 May 1857, the eighth Duke of Beaufort gave ten pounds and John Rolls placed twenty pounds into a fund to start the Monmouth Cattle Show. The show was first staged in the October of the same year. Rolls was President of the show for his lifetime and he was succeeded by his son John Allan Rolls in 1870.
In 1876 the show was held in the town's newly established cattle market in Chippenham Fields. The show was then held annually (firstly in October, but then eventually moved to August – taking up its now traditional date of the last Thursday in August) up until the First World War. The show was restarted in 1919 when it was renamed the Monmouthshire County Show. The show was not held during the period of the Second World War, but from 1946 until 2006 it was held each year on the grounds of Vauxhall Fields. The show was not held in 1956 or 2001 due to outbreaks of foot and mouth disease.
2007 marked the 150th anniversary of the Monmouthshire Show Society. That same year the show moved to a new site on the Redbrook Road in Monmouth.
When the show started it was originally held in October but it was brought forward to September to improve the likelihood of good weather. The date has now moved to the first Saturday in July since 2017.
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