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Mount Robert Carpark, St Arnaud
9 km
5 hours
600 metres
If you’ve ever seen a postcard of Nelson Lakes National Park, chances are it featured the piercing blue waters of Lake Rotoiti framed by the rugged, snow-dusted peaks of the St Arnaud Range. While many visitors are content to stay at the lake’s edge, there is a special kind of magic reserved for those who head uphill. The Mount Robert Circuit is, quite simply, one of the best day walks in the South Island.
This 9km loop offers a quintessential New Zealand alpine experience without requiring a multi-day commitment. It’s a trail that transitions from the whispering shade of ancient beech forests to the wide-open, wind-swept grandeur of the Southern Alps. Whether you are a local looking for your weekend fitness fix or a tourist wanting to see the "Big Country" of the South Island, this circuit delivers a massive reward for your effort.
The Mount Robert Circuit is a tale of two halves, and your experience will depend largely on which way you choose to tackle the loop. Most seasoned trampers recommend heading up the Pinchgut Track and descending via Paddy’s Track.
Starting from the Mount Robert Carpark, the Pinchgut Track wastes no time living up to its name. It is a relentless, zig-zagging climb that gains elevation quickly. You’ll find yourself beneath a canopy of regenerating beech forest, where the air is cool and smells of damp earth and moss. As you push higher, the trees begin to shrink and thin out, eventually giving way to the sub-alpine zone. This is where the magic happens. Suddenly, the canopy disappears, and you are standing on the edge of a vast glacial basin. Below you, Lake Rotoiti stretches out like a sheet of blue silk, and the tiny township of St Arnaud looks like a toy village in the distance.
The track then traverses an exposed ridgeline. This section is the highlight of the walk, offering a true sense of "being in the mountains." On a clear day, the views extend across the Wairau Valley and deep into the heart of the Nelson Lakes National Park. You’ll eventually reach Bushline Hut, a classic DOC (Department of Conservation) hut perched in a spectacular spot overlooking the lake. It’s the perfect place to catch your breath, have a snack, and chat with other hikers.
From the hut, the circuit begins its descent via Paddy’s Track. This side of the mountain is more open and rocky, winding through scree-filled gullies and alpine herb fields. The descent is generally gentler on the knees than the ascent, allowing you to keep your eyes on the horizon. Eventually, you’ll re-enter the forest for the final leg back to the carpark. While the trail is rated as hard due to the 600-metre elevation gain and the rugged nature of the alpine terrain, it is well-formed and easy to follow. It’s also surprisingly kid-friendly for active families with older children who have a bit of hiking experience under their belts. Just be prepared for a few "are we there yet?" moments during the initial climb!
The Mount Robert Carpark is located at the end of Mount Robert Road, approximately 5 km from St Arnaud township. The road is gravel, narrow, and winding in sections, requiring caution. Toilets are available at the carpark. On busy weekends, the carpark can fill up quickly, so an early arrival is recommended. Vehicles longer than 7 metres are not recommended on Mount Robert Road. The carpark has been known to be targeted by vandals, so ensure all valuables are locked away or not left in sight.
Get DirectionsKeep an eye out for these native and local bird species along the trail
Nestor notabilis
Intelligent alpine parrot endemic to the South Island. Known for curiosity and problem-solving abilities.
Best time: Year-round
Prosthemadera novaeseelandiae
Endemic New Zealand honeyeater with distinctive white throat tuft and iridescent plumage. Known for its complex and beautiful song.
Best time: Year-round
Refuel after your hike at these nearby spots
5km away
The only full-service restaurant in St Arnaud village, offering breakfast, lunch, dinner, and takeaway pizzas. Known for its cozy atmosphere, stunning natural views, and dishes crafted from local ingredients.
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Loop
The standout attraction of the Mount Robert Circuit is, undeniably, the panoramic vistas of Lake Rotoiti. There are several "photo stops" along the ridgeline where the lake is perfectly framed by the surrounding mountains.
Bushline Hut is another highlight. Even if you aren't staying the night, the hut's deck offers one of the best lunch spots in the region. It’s a great example of New Zealand’s tramping culture—rugged, functional, and situated in a location that a five-star hotel would envy.
Keep an eye out for the unique alpine flora. Above the bushline, the landscape is dotted with hardy tussocks, mountain daisies, and specialized plants that cling to the rocky slopes. The transition from the lush, green beech forest to this stark, beautiful alpine environment is one of the most interesting geological features of the walk.
To reach the trailhead, drive to the village of St Arnaud. From there, follow Mount Robert Road for about 5km until you reach the end. Be aware that the road is gravel, narrow, and can be quite winding. Take it slow, especially on the corners.
The Mount Robert Carpark has toilets available, which is handy before you set off. However, a few words of caution: this carpark is a known hotspot for opportunistic thieves. Ensure you don't leave any valuables in your vehicle, and try to make the car look as empty as possible. Also, if you are driving a campervan or a large vehicle, note that vehicles longer than 7 metres are not recommended on this road due to the tight turns and narrow sections. On sunny weekends, the carpark fills up by mid-morning, so an early arrival is highly recommended to secure a spot.
Nelson Lakes is a haven for native birdlife, and the Mount Robert Circuit provides a fantastic cross-section of habitats to explore.
In the lower beech forests, keep an ear out for the melodic chime of the Bellbird (Korimako) and the boisterous call of the Tūī. You are almost certain to encounter the South Island Robin (Toutouwai); these friendly little birds are famously curious and will often hop right up to your boots to see if you’ve stirred up any insects in the leaf litter.
As you move into the higher forest and near the bushline, listen for the high-pitched "zee-zee" of the Rifleman (Tītitipounamu), New Zealand’s smallest bird. If you are very lucky, you might spot the rare Yellowhead (Mohua).
Once you hit the alpine zone, keep your eyes on the sky. The Kea, the world’s only alpine parrot, is an occasional visitor here. They are highly intelligent and inquisitive, but remember: never feed them, no matter how much they beg for your sandwich!
The area around Lake Rotoiti and Lake Rotoroa holds deep significance for Māori, particularly for the Ngāti Apa ki te Rā Tō iwi. According to legend, the lakes were carved out by the great explorer Rākaihautū using his digging stick (tuwhakaroria), creating the "food baskets" that provided sustenance for generations.
The name Rotoiti translates to "Little Lake," while Rotoroa means "Long Lake." Historically, this region was a vital travel route for Māori moving between the east and west coasts of the South Island, particularly in the search for pounamu (greenstone).
Geologically, the landscape is a masterclass in glacial action. The massive U-shaped valleys and the moraine wall that holds Lake Rotoiti in place are reminders of the enormous glaciers that once dominated this region. Today, the area is a focal point for conservation, with the Rotoiti Nature Recovery Project working hard to control pests and bring back the dawn chorus that once filled these valleys.
After five hours on the trail, you’ll likely be ready for some serious refueling. Head back down to St Arnaud village (just 5km away) where you have a few excellent options:
The Mount Robert Circuit is more than just a hike; it’s an invitation to stand on top of the world for a moment and appreciate the raw beauty of the South Island. Put it at the top of your Nelson Lakes bucket list!
Gallirallus australis
Flightless rail known for bold, inquisitive behaviour. Found mainly in the South Island and some offshore islands.
Best time: Year-round
Petroica australis
Friendly forest bird that often approaches walkers. Males are dark grey-black; females are paler.
Best time: Year-round
Anthornis melanura
Endemic songbird with bell-like calls. Males are olive-green with a purple head sheen; females are browner with a narrow white-yellow stripe across the cheek.
Best time: Year-round
Acanthisitta chloris
The tītitiponamu is New Zealand's smallest native bird, often seen flitting quickly up tree trunks and branches.
Best time: Year-round
Mohoua ochrocephala
Also known as the yellowhead, this small, insect-eating bird is a threatened species unique to the South Island forests.
Best time: Year-round
5km away
A local store offering takeaway food, a cafe menu, and coffee, perfect for a quick bite before or after your hike.
5km away
A cafe in St Arnaud that is open throughout the day, offering another option for hikers seeking refreshments.