America spans an enormous range of climates, from the subtropical warmth of Florida to the subarctic extremes of the far north, and the gap between the warmest and coldest states exceeds 40 degrees Fahrenheit. At the frigid end of that spectrum sits a group of states where winter is not a season to endure for a few weeks but a defining force that shapes daily life for months. Alaska leads this group by a margin so wide it stands alone, followed by a cluster of Northern Plains, Upper Midwest, Mountain West, and New England states where subzero temperatures and heavy snow are annual certainties. Knowing which states are coldest, what drives their cold, and how that cold affects the homes people live in matters for anyone considering a northern move or evaluating property in a cold climate.

This piece ranks the coldest states, explains the geography behind the cold, and looks at the real consequences of extreme cold for housing and the cost of ownership.

How Cold Is Measured Across States

Ranking the coldest states requires a consistent measure, and the standard is the average annual temperature calculated for each state. A statewide average is not the reading of a single thermometer but a figure NOAA constructs from thousands of weather station observations spread across a fine grid and weighted by area, so it represents an entire state at once rather than any one location.

The coldest states by this measure are concentrated in the northern United States, where higher latitudes and continental climates produce long, harsh winters with heavy snowfall. They cluster in the Upper Midwest, the Northern Plains, the Mountain West, and northern New England, regions defined by their proximity to Canada, their distance from the equator, or their high elevation. A complementary measure looks at winter severity alone, averaging the three coldest months of December, January, and February, which often reveals just how brutal a state’s winter is even when its annual average is moderated by milder shoulder seasons. Both measures identify a similar group of states, though the precise order can shift depending on which is used and which year’s data is applied, since a single year’s weather differs from a long-term climate normal.

Alaska Stands Alone

Alaska is the coldest state in the United States, and the remarkable thing is the size of its lead. Alaska averages roughly 29 degrees Fahrenheit annually, the lowest in the country, placing it nearly 15 degrees colder than the next-coldest state. That margin is wider than the gap separating the second-coldest state from states in the mid-50s, which means Alaska does not merely top the ranking but occupies a category entirely its own.

The intensity of Alaska’s cold comes from its geography. Positioned in North America’s extreme northwest corner near the Arctic, Alaska endures long, dark winters, and even its summers remain cool. The interior, around Fairbanks, sees the most extreme temperatures, with winter lows plunging toward minus 50 degrees Fahrenheit, while the state’s record low reached an astonishing minus 80 degrees at Prospect Creek Camp in 1971. Ocean currents and cold winds flowing down from northern Canada and Siberia drive this severity, combined with the deep continentality and prolonged winter darkness of the interior. The remote town of Utqiaġvik on the Arctic Ocean is arguably the single coldest inhabited location in the country. Nothing else in the United States approaches Alaska’s cold.

North Dakota and the Frozen Plains

North Dakota ranks as the coldest state in the contiguous United States, brutally cold despite being a distant second to Alaska. Sitting in the geographic center of North America, North Dakota is exposed to Arctic air that rolls south across flat prairie with no mountain barrier to slow it. The state’s winter average, across December through February, sits just under 13 degrees Fahrenheit, and wind chills reaching minus 50 occur nearly every winter.

North Dakota exemplifies the extremes of a continental interior climate. In 1936, the state recorded its coldest day ever at minus 60 degrees in Parshall in February, then months later registered 121 degrees in Steele in July, a temperature swing of 181 degrees within a single year. This enormous range reflects the absence of any moderating ocean influence, which allows both fierce summer heat and severe winter cold. The neighboring Upper Midwest states, Minnesota chief among them, share this pattern, enduring long subzero winters and heavy snowfall driven by the same Arctic air masses that sweep across the northern plains.

The Mountain West and the Power of Elevation

Some of the coldest states are not among the farthest north, and this reveals the importance of altitude. Wyoming and Montana rank among the coldest states in the country, colder than several states closer to the Canadian border, because elevation can substitute for latitude. Both average in the mid-40s Fahrenheit, cold figures produced largely by their high elevations rather than their position on the map.

NOAA’s methodology accounts directly for elevation, which is why a high interior Western state can rival the cold of one near the northern border. In these mountain states, higher elevations bring colder temperatures, longer winters, and heavier snowfall, with mountainous regions significantly colder than the valleys below. Montana, known as Big Sky Country, endures harsh winters especially in its mountains, where snow-capped peaks and frozen lakes define the season. Idaho follows the same pattern, its mountain terrain driving the statewide cold. This elevation effect explains why the coldest states include high-altitude interior states and are not simply the northernmost ones, since thin mountain air produces genuine cold regardless of how far south a state sits.

Northern New England

The northern reaches of New England complete the ranking of coldest states, their cold produced by a combination of latitude and continental influence. Maine consistently ranks among the coldest states, with winter averages in the low 30s and steady snowfall throughout the season. Vermont and New Hampshire share this cold, their winters marked by consistent snow and low temperatures that have made the region a hub for winter sports, drawing skiers and snowboarders to mountain resorts across the three states.

While not as extreme as Alaska or the Northern Plains, the cold in northern New England is sustained and severe enough to shape both daily life and the regional economy. The reliable snowfall sustains a substantial winter recreation industry, and generations of adaptation to long winters have shaped the character of these communities. Maine, with its northern latitude and exposure to cold air masses, endures winters that place it firmly among the coldest states in the nation.

What Makes These States So Cold

Several factors combine to determine a state’s cold, and together they explain the pattern of the rankings. America’s coldest states lie in the northern regions near Canada or at high altitudes, and the primary drivers are latitude, elevation, and continentality.

Latitude is the most intuitive factor, since states farther from the equator receive less direct sunlight and grow colder, which accounts for the dominance of northern-tier states. Elevation is nearly as powerful, as temperatures fall with altitude, letting high mountain states like Wyoming and Montana rank among the coldest despite not being the farthest north. Continentality, the distance from the moderating influence of oceans, intensifies cold in interior states like North Dakota, where no nearby ocean buffers the extremes and Arctic air flows unobstructed across open terrain. Proximity to water can moderate temperatures or, through lake-effect snow, intensify winter conditions depending on the geography. These factors together explain why the coldest states concentrate in the Upper Midwest, Northern Plains, Mountain West, and northern New England, with Alaska’s far northern position setting it apart from all the rest.

How Cold Shapes Homes and Their Costs

For anyone weighing a home in one of the coldest states, the cold carries direct and significant consequences for how homes are built and what they cost to own, and those consequences track the temperature closely.

The frost line is the clearest illustration of cold reaching into property. It is the depth to which winter cold penetrates the soil, and across all fifty states, how deep the ground freezes moves almost exactly opposite to temperature, a single factor that explains roughly four-fifths of why one state is colder than another. Its practical effects are profound. In Alaska, frost can reach around 100 inches deep, deep enough to dictate how foundations and pipes must be built. In cold states generally, foundations must extend below the frost line so that freezing and thawing ground does not heave and crack them, and water pipes must be buried deep enough to avoid freezing. Building codes encode these requirements, which makes construction in cold states inherently more expensive, as deeper foundations and frost-protected plumbing add costs that warmer states never face.

Heating costs are the most direct financial burden of a cold climate. Homes in Alaska, North Dakota, Minnesota, and the other coldest states require substantial heating for months on end, and the energy needed to keep a home warm through a long, severe winter is a major recurring expense unknown in warmer states. Given the length and severity of the heating season, heating ranks among the largest components of the cost of homeownership in these states, and buyers should build realistic heating costs into any assessment of affordability.

Cold shapes housing in further ways beyond foundations and heating. Homes in cold states need robust insulation, high-performance windows, and heating systems capable of withstanding extreme cold, all of which raise construction and maintenance costs. Roofs must bear heavy snow loads, especially in mountain states and snow-belt regions where annual snowfall can range from 50 to more than 200 inches depending on elevation and geography. Pipes inside and outside the home require protection against freezing, a constant winter concern. These demands mean homes in cold climates are built differently and cost more to construct and maintain than comparable homes in temperate regions, a reality that shapes property markets throughout the northern and mountain states.

The practical lesson for prospective residents and buyers is that cold in these states is not merely a comfort issue but a substantial factor in the cost and nature of housing. A home in a cold state comes with higher heating bills, more demanding maintenance to guard against freezing and snow, and construction built to standards warmer regions never require. Yet many of the coldest states offer real advantages, from the natural beauty and winter recreation of Montana, Vermont, and Maine to the affordability and open space of the Northern Plains, and for those prepared for the winters, they can be excellent places to live. Understanding what the cold demands, in heating costs, frost-protected construction, and winter-ready housing, is essential for anyone making a property decision in America’s coldest states, where the thermometer shapes not only the weather but the fundamental economics of owning a home.

FAQ

What is the coldest state in the US?

Alaska is the coldest state in the United States by a wide margin, averaging roughly 29 degrees Fahrenheit annually, nearly 15 degrees colder than any other state. Its extreme cold comes from its far northern position near the Arctic, cold winds from northern Canada and Siberia, and the deep continentality of its interior. The Fairbanks area sees winter lows near minus 50 degrees, and the state’s record low reached minus 80 degrees. No other state approaches Alaska’s cold, placing it in a category of its own.

What are the coldest states after Alaska?

After Alaska, North Dakota is the coldest state in the contiguous United States, with a winter average just under 13 degrees Fahrenheit, driven by its central position where Arctic air sweeps south across flat prairie unobstructed. Other consistently cold states include Minnesota, Maine, Wyoming, Montana, Vermont, and New Hampshire. The precise order varies by year and by whether annual or winter-only averages are used, but these northern and mountain states reliably rank among the coldest.

Why are Wyoming and Montana so cold despite not being the farthest north?

Wyoming and Montana rank among the coldest states because of their high elevations, since altitude can substitute for latitude. Temperatures drop as elevation rises, so the high mountain terrain of these states produces cold comparable to states nearer the Canadian border despite their more southerly location. NOAA accounts directly for elevation in its calculations, which is why these interior Western states with substantial mountain terrain match or exceed the cold of some northern-tier states. Their mountain regions are considerably colder than their valleys.

How are the coldest states measured?

The coldest states are ranked by average annual temperature, which NOAA calculates from thousands of weather station observations spread across a fine grid and weighted by area, representing an entire state rather than a single point. An alternative measure uses winter-only averages for December, January, and February to capture the severity of the cold season. Both approaches identify a similar group of states, though the order can shift depending on which measure is used and which year’s data is applied.

How does extreme cold affect homes in cold states?

Extreme cold has major effects on housing. The frost line, the depth cold penetrates the soil, can reach about 100 inches in Alaska, requiring foundations to extend deep below ground and pipes to be buried deep to prevent freezing, which raises construction costs. Homes need robust insulation, high-performance windows, heating systems built for extreme cold, and roofs able to bear heavy snow loads. Heating is a major ongoing expense given the long, severe winters. These requirements make homes in cold states more expensive to build and maintain than those in temperate regions.

Which states have the most severe winters?

Alaska has the most severe winters by a wide margin, with months of subzero temperatures, long dark nights, and extreme cold. In the contiguous United States, North Dakota and the Upper Midwest states like Minnesota experience the most severe winters, with December-to-February averages in the low teens and wind chills reaching minus 50 degrees. The mountain states of Wyoming, Montana, and Idaho endure severe winters at elevation with heavy mountain snowfall, while northern New England states like Maine and Vermont have long, snowy winters that sustain a major winter sports industry.