Ashtown was educated at Eton College. On 11 January 1894, he married Violet Grace Cosby, the youngest daughter of Col. Robert Ashworth Godolphin Cosby of Stradbally Hall, Queen's County.
Ashtown attended Eton College and later married Violet Grace Cosby, the daughter of Colonel Robert Ashworth Godolphin Cosby from Stradbally Hall in Queen's County on January 11, 1894.