The 43km Dun Mountain Trail is one of New Zealand's Great Rides, and one of the most accessible back country alpine cycle trails in the country. Note that the 43.2km is from Nelson i-Site back to Nelson i-Site or it is 38.2km from Codgers to Codgers.
Starting from the Nelson suburbs the route winds its way through the Codgers Mountain Bike Park along the route of New Zealand’s first railway before emerging into the alpine mineral belt near the summit of Dun Mountain (878m). From the top you are faced with a challenging and technical single-track descent that drops for nearly 10km, emerging at the Maitai Dam. The last 11km of the ride follows the Maitai river into the heart of Nelson where you can relax with a beer, wine or cool glass of juice.
The Dun Mountain Trail requires a good fitness level and all riders who want to complete the circuit and ride from Coppermine Saddle to the Maitai should be confident grade 4 mountain bikers. A full suspension bike is recommended. For less expert mountain bikers, the ride up and back via Third House is still a great day out, just remember that there will be people riding up as you ride down. You will be a long way from assistance, and mobile phone reception is patchy, so please ensure you have sufficient food, drink, spare tubes and wet weather gear to handle any problems you might encounter.