The route was launched on 1 June 2005 to complement the popular Sea to Sea Cycle Route (C2C) that runs from Whitehaven to Sunderland. It is designed to be slightly harder and longer than this other route, totalling either . When launched the route used sections of NCN Routes 72, 68 and 71 west of the Pennines. From Tan Hill to Sunderland a new Regional Route was created and given the number 20, with a blue background. In 2012, after improvements to meet National Cycle Network standards, it was upgrade to National Route 70. Route signs were changed to the number 70 with a red background. Around the same time the sections on the route that had previously been Route 71 and 72 were re-signed as Route 70. In 2007 a southern branch from Barnard Castle to Whitby was added. Originally classified as regional route 52, it was upgraded to National Cycle Route 165 in 2012. The Walney to Whitby route is .