Roughly 80 percent of Greenland lies buried under an ice sheet up to three kilometers thick, leaving only a narrow coastal fringe, about 410,000 square kilometers, that is technically ice-free. But “ice-free” is a far cry from “habitable.” Much of that exposed land is steep mountain terrain cut by deep fjords, underlain by permafrost, and locked in conditions that make permanent settlement difficult or impossible. Greenland’s population of around 56,000 people clusters in small towns and villages along the southwest coast, occupying a sliver of the island so thin it barely registers on a map.
What the Ice-Free Fringe Actually Looks Like
Greenland’s shape, geologically speaking, is a bowl. The interior is a basin depressed below sea level by the weight of the ice sheet, while peripheral mountain ranges ring the edges. The ice sheet fills this bowl, pushes through the mountains in places, and calves directly into the sea at many points along the coast. The ice-free areas sit at the fringes, squeezed between glacier outlets and ocean, and are themselves mountainous and deeply incised by fjords.
1Geological Society of America. Quaternary Geology of the Ice-Free Areas and Adjacent Shelves of GreenlandThe terrain alone rules out large tracts. Fjord walls rise steeply from the water, leaving only narrow strips of relatively flat ground at their heads or along their shores. Thin glacial till covers much of the exposed rock, but deep, fertile soil is rare. The patches of usable lowland are scattered, isolated from one another by ice tongues and mountain ridges, and often reachable only by boat or helicopter. This fragmented geography is one reason Greenland’s settlements never grew into large connected cities the way communities on continental landmasses did.
Permafrost Under Every Surface
Even where the ice sheet has retreated, the ground itself is frozen. Continuous permafrost extends across northern Greenland and persists in discontinuous patches down the west coast as far as the southernmost towns. Permafrost does not make land uninhabitable in an absolute sense, since people build on frozen ground across the Arctic, but it imposes steep engineering costs. Buildings need elevated foundations. Roads buckle and crack as the active layer freezes and thaws each year. A study of Arctic road infrastructure found that about 12 percent of paved roads built on sediments were highly susceptible to permafrost thaw settlement, meaning they could require significantly more maintenance as temperatures rise.
2Cold Regions Science and Technology. Thaw settlement susceptibility mapping for roads on permafrost – Towards climate-resilient and cost-efficient infrastructure in the ArcticFor a place like Greenland, where most communities rely on unpaved tracks or no roads at all between towns, the permafrost challenge is less about road repair and more about what can be built in the first place. Water and sewer pipes cannot simply be buried underground. In many settlements, water is delivered by truck to household tanks, and sewage is collected in bags or holding tanks rather than flowing through buried mains. The ground conditions that most people in temperate climates take for granted, stable soil you can dig into, simply do not exist across most of Greenland’s ice-free land.
Where People Actually Live
Greenland’s population concentrates overwhelmingly in the southwest. Nuuk, the capital, is home to roughly a third of the island’s residents. A handful of other towns, including Ilulissat, Sisimiut, and Qaqortoq, account for much of the rest. The east coast is nearly empty, with only a few small settlements like Tasiilaq and Ittoqqortoormiit clinging to fjord shores. The far north has just a couple of inhabited places, including Qaanaaq, where the local population has relied for centuries on the marine resources sustained by the North Water polynya, a persistently open patch of sea between Greenland and Canada that supports rich populations of fish, seals, and seabirds.
3PubMed Central. Introducing the North Water: Histories of exploration, ice dynamics, living resources, and human settlement in the Thule RegionThe pattern is not random. The southwest coast benefits from a relatively mild maritime climate, access to open water for fishing and transport, and some of the only terrain flat enough to support an airport runway. Settlements elsewhere exist largely because of specific local resources: good fishing grounds, a sheltered harbor, or proximity to hunting areas. The idea that Greenland has vast empty lands waiting for people to move in misses the point. The empty land is empty for reasons that are expensive or impossible to overcome.
Growing Seasons and Thermal Limits
Temperature is the most basic constraint. Even in southwest Greenland, the thermal growing season, the window when average daily temperatures stay above the threshold for plant growth, is remarkably short. At Upernavik in the northwest, the growing season historically began around early August and ended by mid-August, barely two weeks. Stations farther south in western Greenland fare somewhat better, but normal mean annual temperatures have historically run about half a degree Celsius below what would be considered marginal for most temperate crops.
4Taylor & Francis Online (Arctic, Antarctic, and Alpine Research). Variations in Thermal Growing, Heating, and Freezing Indices in the Nordic Arctic, 1900–2050Climate projections for the mid-21st century suggest western Greenland could see a modest temperature increase of less than 2°C above present normals, which would lengthen the growing season but not transform the landscape into farmland overnight. For comparison, Iceland’s growing season is already substantially longer, and even Iceland struggles to grow anything beyond hardy grasses and root vegetables without greenhouses. Greenland’s thermal window is a hard ceiling on what the land can support.
4Taylor & Francis Online (Arctic, Antarctic, and Alpine Research). Variations in Thermal Growing, Heating, and Freezing Indices in the Nordic Arctic, 1900–2050The Small World of Greenlandic Agriculture
Agriculture in Greenland exists, but it is tiny and confined to the southernmost tip of the island. Sheep farming has been practiced in the Qaqortoq and Narsaq area since the early 20th century, taking advantage of the relatively mild conditions and grassy valleys that the Norse once used for the same purpose a thousand years ago. Farmers already use irrigation and fertilizer to boost production, and studies have modeled how rising temperatures could expand the area of sufficient biomass for grazing. But the projections are driven solely by temperature, and real-world farming depends on soil quality, water availability, and proximity to settlements and infrastructure.
5Science of The Total Environment. Greenlandic sheep farming controlled by vegetation response today and at the end of the 21st CenturySome potato and vegetable growing has expanded in recent years, again limited to the south. Greenland imports the vast majority of its food. The arable potential of the ice-free land is a rounding error by any global standard, and even under optimistic warming scenarios, the island is unlikely to become a meaningful agricultural producer. The soil is thin, the terrain is steep, and the growing window is punishingly short.
Water Supply as a Habitability Bottleneck
Greenland is surrounded by ice and ocean, yet access to clean freshwater is a genuine challenge for many communities. Most of the island’s freshwater is locked in the ice sheet itself. In ice-free areas, rivers and lakes provide water, but infrastructure to treat and deliver it is limited. In rural settlements, many households rely on water trucked to holding tanks or collected directly from rivers, lakes, and even sea ice. Research on domestic water supply in rural Greenland found that even in towns with piped water, residents often preferred to collect drinking water from natural sources like rivers, especially during summer months when access was easier.
6PubMed Central. Domestic water supply in rural Greenland – sufficiency, affordability and accessibilityGlacial meltwater is creating new freshwater resources. Glacial lakes are expanding rapidly across the Arctic as ice retreats, and about half of the world’s glacial lake water volume sits within roughly 60 kilometers of a coastline and below 200 meters elevation, much of it in places like Greenland, Arctic Canada, and Patagonia. For now, demand in these areas is low enough that the supply is more than sufficient. But if populations grow or new mining and industrial operations expand, the question of how to capture and deliver that meltwater will become a real infrastructure problem.
7Nature Water. Evolving resource potential of glacial lakes with ongoing deglaciationWhat the Norse Experiment Tells Us
Greenland has been through this before, in a sense. Norse settlers arrived around 985 CE and established two main colonies in the southwestern fjords. For about 500 years, they raised cattle and sheep, built churches, and traded walrus ivory with Europe. Isotope records from lake sediments in the Eastern Settlement confirm that southern Greenland experienced a period of relative warmth between roughly 900 and 1400 CE, overlapping with what is sometimes called the Medieval Warm Period. This warmth made pastoral farming viable, though the Norse diet always depended heavily on marine resources as well.
8Geology. Medieval warmth confirmed at the Norse Eastern Settlement in GreenlandThe end of the Norse colonies is a cautionary tale about habitability’s fragility at high latitudes. The climate shifted toward the Little Ice Age starting around 1250 CE, and conditions became increasingly unstable. The southern Greenland ice sheet readvanced during this period, and research has shown that sea-level rise driven by glacial rebound and ocean dynamics flooded lowland pastures that the Norse had depended on for grazing.
9PubMed Central. Sea-level rise in Southwest Greenland as a contributor to Viking abandonmentThe Norse vanished from Greenland by the mid-15th century. Their failure was not simply about cold weather. It was about a suite of pressures, loss of pastureland to rising seas and advancing ice, disrupted trade routes, and an unwillingness or inability to adopt the marine-hunting strategies that Inuit communities used to thrive in the same environment. The Inuit, who arrived in Greenland centuries before the Norse disappeared, successfully inhabited far harsher areas of the island by orienting their entire economy around sea ice, marine mammals, and seasonal mobility. Habitability, it turns out, depends as much on cultural adaptation as on raw climate.
Greenland Is Getting Greener, Literally
Satellite imagery over the past three decades shows a striking change: the amount of vegetation across Greenland’s ice-free areas has roughly doubled. Shrubs are expanding into areas that were previously bare rock or thin tundra, particularly in the southwest. This phenomenon, observed widely across the Arctic, is driven primarily by rising temperatures extending the growing season and allowing woody plants to establish where they previously could not survive.
10PubMed Central. Land cover changes across Greenland dominated by a doubling of vegetation in three decades 11Arctic, Antarctic, and Alpine Research. Shrub Expansion in SW Greenland Under Modest Regional Warming: Disentangling Effects of Human Disturbance and Grazing
Climate models project substantially larger areas becoming suitable for trees and shrubs by 2100, with expansion reaching even into northern Greenland. The regions around Kangerlussuaq and Nuuk in central-western Greenland, and parts of the central-east coast, are projected to see the greatest increases in the number of native and non-native species that could establish.
12PubMed Central. A greener Greenland? Climatic potential and long-term constraints on future expansions of trees and shrubsWhether greening translates into greater habitability for humans is less certain. Vegetation expansion stabilizes soil and could eventually support more grazing. But the greening is happening on terrain that remains steep, remote, and permafrost-riddled. A hillside covered in dwarf willows is more ecologically productive than bare rock, but it is not farmland, and it is not a place where you would build a town.
New Land Emerging from Meltwater
One of the more counterintuitive effects of ice sheet retreat is the creation of new land. As glaciers thin and pull back, meltwater carries enormous quantities of sediment into fjords and lakes, building deltas that grow outward year by year. The Sermilik delta in southeast Greenland expanded by roughly 26 square kilometers between 1987 and 2022, gaining area at an accelerating rate driven by increasing meltwater runoff.
13Earth Surface Processes and Landforms. Accelerating growth of Sermilik Delta, Greenland (1987–2022), driven by increasing runoffSimilar delta growth is occurring around the island wherever meltwater rivers meet the coast or lakes. These deltas are flat and low-lying, which in principle makes them more buildable than the surrounding mountains. In practice, they are made of loose, freshly deposited sediment, subject to flooding, and located in remote areas with no infrastructure. They are fascinating as a geological process, but calling them habitable land would be a stretch for now.
10PubMed Central. Land cover changes across Greenland dominated by a doubling of vegetation in three decadesNatural Hazards Along the Coast
The same climate-driven changes that are greening Greenland and creating new deltas are also generating new dangers. As glaciers thin, the mountain slopes they once buttressed become unstable. In 2023, a massive rock-and-ice avalanche of about 25 million cubic meters plunged into Dickson Fjord in eastern Greenland, triggering a tsunami with an initial wave height of 200 meters. The resulting seiche, a standing wave that sloshed back and forth in the enclosed fjord, generated a seismic signal that was detected globally for nine days.
14PubMed. A rockslide-generated tsunami in a Greenland fjord rang Earth for 9 daysThat event occurred in an uninhabited fjord. An earlier landslide-triggered tsunami in 2017 was not so fortunate. A rockslide into Karrat Isfjord in western Greenland sent waves into the small settlement of Nuugaatsiaq, destroying community infrastructure, injuring several people, and killing four.
15Natural Hazards and Earth System Sciences. Arctic tsunamis threaten coastal landscapes and communities – survey of Karrat Isfjord 2017 tsunami effects in Nuugaatsiaq, western GreenlandThese events are not freak occurrences that can be dismissed. Researchers describe them as part of a cascading feedback loop between the cryosphere, the oceans, and the rocky landscape. As ice continues to retreat, more slopes will be exposed and destabilized, and more fjord communities will face tsunami risk. For a population that lives almost entirely on fjord shores, this is a direct threat to the already limited habitable zone.
Mosquitoes and the Paradox of Summer
One rarely discussed factor that shapes life in Greenland’s ice-free areas is the insect situation during the brief summer. When temperatures climb above freezing and the tundra thaws into shallow pools, mosquitoes emerge in enormous numbers. A survey at Thule Air Base in far northwestern Greenland, one of the most remote inhabited places on Earth, documented swarms of blood-feeding mosquitoes from June to late August. Active breeding sites were found throughout the base and the surrounding valley, and over 3,000 individual mosquitoes were collected during just a few weeks of sampling.
16BioOne Complete. Mosquitoes of Thule Air Base, GreenlandMosquitoes do not make land uninhabitable in any strict sense, but they shape how and when people use the landscape. For caribou herders, hikers, and construction workers, the summer mosquito season is a genuine occupational hazard. In some parts of the Arctic, mosquito harassment is intense enough to affect caribou migration patterns and reduce the time people spend outdoors. It is a small reminder that habitability is not just about temperature and terrain. The brief window when Greenland’s tundra is warm enough to be comfortable for humans is also the window when it is most comfortable for biting insects, and the insects have a significant head start in numbers.