Beaumont was born at Bywell Hall, Northumberland, the son of Wentworth Beaumont, 1st Baron Allendale, by his first wife Lady Margaret Anne de Burgh, daughter of Ulick de Burgh, 1st Marquess of Clanricarde, and his wife Harriet Canning, daughter of George Canning.

He attended Eton and graduated from Trinity College, Cambridge with an MA in 1888.

[2] Beaumont was Member of Parliament for Hexham from 1895 to 1907 and served under Sir Henry Campbell-Bannerman as Vice-Chamberlain of the Household from 1905 to February 1907, when he succeeded his father in the barony of Allendale.

He was appointed Captain of the Yeomen of the Guard in April 1907 and was sworn of the Privy Council the following month.

They had six children: Lord Allendale died in London in December 1923, aged 63, and was buried in the grounds of Bretton Hall, near Wakefield.