1948 Aoraki Mount Cook South Ridge Expedition
Sir Edmund Hillary and Harry Ayres achieved the first ascent of the demanding South Ridge of Aoraki / Mount Cook (3,724m) on January 30, 1948, establishing a landmark in New Zealand alpine climbing.

Mountain Safety & Conditions Disclaimer: High-altitude climbing, glacial travel, and technical ascents entail severe objective risks including avalanches, serac collapses, rapid weather collapse, and altitude illness. Historical route descriptions and summit claims on Mountanity reflect documented archival sources and must not be used as live operational safety assessments. Local regulations, permits, and physical glacial topography change continuously.
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Official Expedition Narrative & Archival Record
In January 1948, Edmund Hillary teamed with New Zealand's greatest ice technician, Harry Ayres, alongside Mick Sullivan and Ruth Adams, to attempt the untamed South Ridge of Aoraki / Mount Cook. Overcoming sheer step-cutting on vertical verglas and knife-edge cornices high above the Caroline Face, Hillary and Ayres reached the High Peak on January 30, 1948. The climb solidified Hillary's extreme technical icecraft and alpine confidence, directly forging the physical endurance that would carry him to the summit of Mount Everest five years later.
Documented Team Composition
- Edmund Hillary
- Harry Ayres (Guide & Co-Leader)
- Mick Sullivan
- Ruth Adams
Key Statistics & Topographic Figures
- Ascent Date
- January 30, 1948
First Ascent of South Ridge
- Lead Climbers
- Harry Ayres & Edmund Hillary
Pioneering Ice Partnership
- Mountain
- Aoraki / Mount Cook (3,724m)
Highest Peak in New Zealand
Archival Primary Source Quotations
“Harry Ayres was the greatest ice climber of our generation. On that South Ridge of Mount Cook, he taught me the balance and rhythm that later took me to the top of Everest.”
Defined Alpine Terminology & Concepts
- South Ridge (Mount Cook)
- A long, heavily glaciated technical ice ridge rising from the Empress Glacier to the low peak of Aoraki / Mount Cook.
Frequently Asked Questions: 1948 Aoraki Mount Cook South Ridge Expedition
Why was the 1948 South Ridge climb of Mount Cook significant for Edmund Hillary?
The January 30, 1948 first ascent of the technical South Ridge of Aoraki / Mount Cook (3,724m) was Edmund Hillary’s breakthrough climb, establishing him as New Zealand’s foremost ice climber and directly leading to his selection for the British Everest expeditions.
Who was Edmund Hillary’s mentor and climbing partner on Mount Cook in 1948?
Harry Ayres, New Zealand’s legendary chief alpine guide and master ice craft technician, partnered with Hillary alongside Mick Sullivan and Ruth Adams.
Ascent Route & Topography

South Ridge of Aoraki / Mount Cook
The South Ridge of Aoraki / Mount Cook is a celebrated technical alpine route on New Zealand's highest peak. First climbed on January 30, 1948, by Sir Edmund Hillary, Harry Ayres, and Mick Sullivan, the route established Hillary's reputation as a world-class ice climber. Starting from Gardiner Hut, climbers traverse the Noeline Glacier to access the knife-edge rock and ice crest. The route demands steep mixed rock climbing, delicate step-cutting on exposed ice slopes, and navigation across corniced arêtes to reach the Low Peak and High Peak (3,724m).
Target Objective Peak
Aoraki / Mount Cook
Aoraki / Mount Cook is the highest mountain in New Zealand at 3,724 meters (12,218 ft). Located in the Southern Alps, it is an ultra-prominent glaciated peak rising dramatically above the Tasman Glacier. It is sacred in Māori mythology as the ancestor Aoraki. The mountain is renowned as the formative training ground where Sir Edmund Hillary developed his high-altitude icecraft. On January 30, 1948, Hillary completed the historic first ascent of the technical South Ridge alongside Harry Ayres. Climbing Aoraki requires expert crampon technique, glacier navigation, and vigilance against severe maritime storms.
Featured Expedition Climber

Sir Edmund Hillary
Edmund Percival Hillary was born in Auckland, New Zealand, on July 20, 1919. A school trip to Mount Ruapehu sparked his lifelong passion for alpine climbing. He completed his first major ascent on Mount Ollivier (1,933m) in 1939. During World War II, Hillary served as a navigator in the Royal New Zealand Air Force. Afterward, he trained under master alpine guide Harry Ayres in the Southern Alps. On January 30, 1948, Hillary and Ayres achieved the first ascent of Mount Cook's South Ridge. This demanding technical climb established Hillary as New Zealand's foremost ice climber. In 1951, Eric Shipton recruited Hillary for the British Everest Reconnaissance Expedition. Hillary and George Lowe pioneered a viable route through the chaotic Khumbu Icefall. Their breakthrough unlocked the southern approach into the Western Cwm. Hillary returned to the Himalayas for the 1952 British Cho Oyu Expedition. There, he tested experimental open-circuit oxygen equipment above 6,800 meters. Colonel John Hunt subsequently selected Hillary for the 1953 British Mount Everest Expedition. On May 29, 1953, Hillary and Tenzing Norgay launched their summit push from 8,500 meters. High on the Southeast Ridge, they encountered a formidable 12-meter rock barrier. This vertical cliff between rock and snow is now called the Hillary Step. Hillary jammed his body into a narrow crack and levered upward with crampons. He breached the crux and safely belayed Tenzing up the pitch. At 11:30 AM, both men reached the 8,848.86-meter summit of Mount Everest. They achieved the first confirmed human summit in history. Between 1956 and 1958, Hillary led the New Zealand Trans-Antarctic expedition party. He drove three modified Ferguson farm tractors across treacherous crevassed icefields. On January 4, 1958, Hillary's team successfully reached the South Pole. It was the first overland journey to the pole since Captain Scott in 1912. In 1960, Hillary organized the high-altitude Silver Hut Expedition. His team conducted physiological research and made the first ascent of Ama Dablam. Hillary dedicated decades of his life to helping the Sherpa communities of Nepal. In 1960, he established the Himalayan Trust to fund essential local infrastructure. The foundation built 27 schools, two hospitals, and twelve medical clinics in Solukhumbu. It also constructed the mountain airstrip at Lukla to connect remote villages. Grateful Sherpas honored Hillary with the affectionate title of Burra Sahib. In 2003, Nepal granted Hillary honorary citizenship, making him the first foreign national so recognized. Queen Elizabeth II invested him as a Knight Companion of the Garter in 1995. Hillary passed away in 2008, remembered worldwide as a compassionate explorer.
Associated Historical Chronicles & Stories
1948 Mount Cook South Ridge: Hillary's Alpine Baptism
How Edmund Hillary and Harry Ayres conquered the unclimbed South Ridge of Aoraki / Mount Cook in 1948.
Documented Sources & Archival Citations
- High Adventure(Sir Edmund Hillary / Hodder & Stoughton)
Supporting claim: First-hand autobiographical account of the 1948 Mount Cook South Ridge first ascent
Accessed/Documented: 1955 - New Zealand Alpine Journal(New Zealand Alpine Club)
Supporting claim: Official expedition chronicle of the South Ridge first ascent
Accessed/Documented: 1948
