Beinn Narnain is usually climbed from Succoth at the head of Loch Long. The most commonly used route starts by climbing directly up the hillside, following a line of concrete blocks that were originally supports for a cable railway used during the construction of watercourse diversions forming part of the Loch Sloy hydro-electric scheme (Until the construction of new path, this was also the route towards The Cobbler). At one point the path crosses a level track, and one must continue by climbing some exposed rock immediately opposite - this appears to be part of the stream bed and not the path.