The most popular route is the 7-kilometre 2.5-hour round-trip trail that starts and ends at the National Park visitor centre in Letterfrack, and does a loop over the summit ridge and back to the main trail; it does not require any special hiking ability and the trail is well marked, with pathways and boardwalks over bog sections. The trail splits into a Lower Diamond Hill Walk (3 km long loop), and an Upper Diamond Hill Walk (3.7 km long loop) which reaches the summit.