While studying at Cambridge University, Hardwicke played first-class cricket on four occasions for Cambridge University Club in 1856 and 1857. He was sworn of the Privy Council in 1866. In 1873 he succeeded his father in the earldom and entered the House of Lords.
The following year he was appointed Master of the Buckhounds under Disraeli, and continued in this post until the government fell in 1880.
In 1879 Lord Hardwicke had a horse race, the Hardwicke Stakes, named after him. Lord Hardwicke married Lady Sophia Georgiana Robertina, daughter of Henry Wellesley, 1st Earl Cowley, in 1863.
The Countess of Hardwicke died in June 1923.
19th United Kingdom Parliament. 20th United Kingdom Parliament.