New Zealand Glacier Map
Tracking the Decline of Southern Alpine Icefields

Southern Alps Glacier Classifications & Vanishing Icefields (South Island)

The Southern Alps / Kā Tiritiri o te Moana still harbor several significant topographic valley glaciers and fragmented icefields. However, the geographic footprint of New Zealand’s ice is shifting. While major trunks like Haupapa / Tasman, Hooker, and Mueller persist east of the Main Divide, and the steep Franz Josef (Kā Roimata o Hine Hukatere) and Fox (Te Moeka o Tuawe) remain to the west, the overall trend is one of rapid icefield decline.

Many short side-valley and cirque glaciers have already vanished, transitioning into debris-mantled stagnant ice or rock-glacier remnants. Our maps track these changes, specifically noting how lake-terminating outlets—most notably the Tasman—retreat at accelerated rates as proglacial lakes expand and enhance calving dynamics.

• Cirque & Side-Valley Glaciers (Declining): These high-elevation ice bodies, once common in shaded Southern Alpine amphitheatres, are now frequently reduced to dead-ice patches or completely deglaciated bedrock basins.
• Long Valley & Plateau-Fed Glaciers (Retreating): Major ice trunks (e.g., Tasman, Murchison, Fox) remain active but exhibit significant topographic thinning and fragmentation. On the eastern slopes, these glaciers increasingly terminate in deep, expanding proglacial lakes.

New Zealand Glacier Retreat Timeline (1850–2026)

This retreat has accelerated significantly since the 1990s, driven by rising End-of-Summer Snowlines (EOSS) and the formation of calving proglacial lakes. Key developments in the timeline include:

• 1850–1970: Steady post-Little Ice Age retreat with occasional pauses. Most valley glaciers remained terrestrial (ending on land).
• 1980s–2000s: A unique maritime "pulse" where West Coast glaciers like Franz Josef and Fox briefly advanced due to increased regional precipitation, despite global warming trends.
• 2008–Present: Rapid, universal retreat. Tasman Glacier has shifted from a stable debris-covered tongue to a rapidly calving ice face, with Tasman Lake expanding to over 7 km in length.
• 2020s Outlook: Access tracks and tourism infrastructure are frequently realigned or closed indefinitely (e.g., Fox Glacier road) due to extreme valley instability and rockfall from thinning ice margins.

South Island Glaciers — Retreat & Recent History

New Zealand’s largest glaciers are concentrated around Aoraki / Mount Cook and the West Coast. Since the late 20th century, most have thinned and retreated markedly, with proglacial lakes expanding on the eastern side and rapid down-valley retreat on the short, steep West Coast glaciers.

Brief histories of key glaciers

• Tasman Glacier (Aoraki / Mt Cook) — A debris-mantled valley glacier that began forming a large terminal lake in the late 20th century; the lake has grown rapidly and promotes calving. Remote sensing shows ~4.5 km of retreat from 1990–2015, with lake depths measured to ~240 m by 2010.
• Franz Josef / Kā Roimata o Hine Hukatere — Famous for short advance phases (notably 1983–2008) followed by very rapid retreat since ~2008 (≈1.5 km by ~2017). Access and visitor management have been repeatedly reworked as valley hazards increased.
• Fox / Te Moeka o Tuawe — Retreated substantially in the 2000s–2020s; the valley access road was closed indefinitely in 2019 after landslide and river damage; visitors now use alternative viewpoints/tracks.
• Hooker Glacier — A growing proglacial lake (Hooker Lake) has accompanied retreat; one assessment indicates ~1.2 km of retreat from 1990–2015. The popular Hooker Valley Track provides views of the evolving lake/terminus.
• Mueller Glacier — Retreated ≈1.5 km (1990–2015) with rapid lake growth; its forefield and moraines are textbook examples used on nearby walking tracks.
• Murchison Glacier — A long east-side valley glacier feeding Tasman in the past; analyses indicate ≈2.7 km of retreat (1990–2015).
• Godley, Hooker & Mueller (east of Main Divide) — Classic long valley glaciers that carved the Waitaki headwaters; all are retreating and contributing to lake growth and forefield change.
• Bonar Glacier (Mt Aspiring region) — Key mountaineering glacier above the Matukituki; like other Aspiring ice it has thinned/retreated; Colin Todd Hut is a common staging point.
• Rob Roy Glacier (Mt Aspiring NP) — A well-known hanging glacier visible from the Rob Roy Track; ongoing retreat and rock/icefall hazards shape visitor management.
• La Perouse, Balfour, Lyell, Douglas, La Perouse tributaries (Aoraki / Westland) — Remote, avalanche-prone valley systems on the west side showing sustained thinning/retreat; rugged access and changing serac/rockfall hazards are noted in climbing guides.
• Garden of Eden / Garden of Allah Ice Plateaus (Adams Wilderness) — Large, remote icefields west of the Main Divide with documented mass-balance sensitivity to albedo/temperature; strictly protected (limited mechanised access).

What’s driving the changes?

On the eastern side, expansion of deep proglacial lakes strongly enhances calving and undercuts glacier snouts, accelerating retreat and modifying flow speeds. West Coast glaciers (short, steep, maritime) respond quickly to multi-year swings in snowfall and temperature: both Fox and Franz Josef advanced during a cluster of cool, snowy years (1980s–2000s) before returning to rapid retreat in the warmer 21st century.

Sources & further reading

• NASA Earth Observatory — “Tasman Glacier Retreats”; “Retreat of the Tasman Glacier”.
• Purdie, H. (2016). “Bathymetric evolution of Tasman Glacier terminal lake” (Marine Geology, abstract). ScienceDirect.
• Dykes, R. C. et al. (2017). “A major ice-calving event at Tasman Glacier terminus…” N.Z. Journal of Geology & Geophysics.
• Pelto, M. (2020s). “New Zealand glacier retreat” (Tasman/Hooker/Mueller/Murchison metrics). glacierchange.blog.
• Te Ara — The Encyclopedia of NZ: Glaciers & glaciation; photo set on Franz Josef advances/retreats.
• DOC (Department of Conservation): Hooker Valley Track; Fox Glacier road access update; Rob Roy Track; 2025 Hooker Track bridge updates.
• Garden of Eden / Allah icefields & Adams Wilderness background: overview.

Scientific Data & Cartographic Sources

The geographic data and glacier extents visualized on this map are derived from the following primary research and monitoring programs: