The Jumbo-Holdsworth Circuit is a popular hiking trail located in the Tararua Range, which is part of the North Island of New Zealand. It is named after the two mountains that the trail crosses: Mount Jumbo and Mount Holdsworth. The trail is known for its stunning views of the surrounding landscape and its challenging terrain, which makes it a favorite among experienced hikers.

The Jumbo-Holdsworth Circuit is approximately 24 kilometers (15 miles) long and typically takes 2-3 days to complete. The trail is well-marked and maintained, but hikers should be prepared for steep climbs, rocky terrain, and potentially hazardous weather conditions. The highest point on the trail is Jumbo Peak, which sits at an elevation of 1,420 meters (4,658 feet).

The trailhead for the Jumbo-Holdsworth Circuit is located at the Holdsworth Campground, which is about a 30-minute drive from the town of Masterton. Hikers should register at Holdsworth Lodge in the intentions book before setting out.

Hikers can choose to complete the circuit in either direction, but most prefer to start at the Holdsworth end and hike up to Powell Hut for the night. The second day typically involves hiking to Mount Holdsworth and traversing the ridge to Jumbo Hut, and either staying another night here, or descending back down to Atiwhakatu Hut and on to the Holdsworth car park through the Atiwhakatu Valley.

Along the way, hikers will encounter a variety of landscapes, including dense forests, alpine meadows, and rocky ridges. They may also spot native New Zealand wildlife, such as the kaka parrot, the North Island robin, and the New Zealand falcon.

The Jumbo-Holdsworth Circuit is a challenging but rewarding hike that offers stunning views of the Tararua Range and the surrounding landscape. Hikers should be prepared for potentially hazardous conditions and bring appropriate gear and supplies, including warm clothing, sturdy hiking boots, and plenty of food and water.