Lowther Castle is owned by Lowther Estate Trust and leased to Lowther Castle & Gardens Trust. It sits at the heart of a 75,000 acre agricultural estate in Cumbria's Lake District National Park, within a 3,000 acre medieval deer park originally laid out by the Lowther family in the 16th and 17th centuries. This was subsequently remodelled by Capability Brown, Richardson and Webb in the 18th and early 19th centuries for the first and second Earls of Lonsdale. The Lowther family is today maintaining and restoring this listed parkland, whilst still farming the estate.