Arctic sea ice has likely reached its smallest extent of the year and begun to refreeze. The preliminary minimum of 4.60 million square kilometers (about 1.78 million square miles) occurred on Sept. 12, based on National Snow and Ice Data Center data, according to an analysis by Alaska climate specialist Rick Thoman published Sept. 17.

That figure ties last year's minimum for the 11th lowest since satellite records began in 1979. At first glance, that sounds like a reprieve, but it is not. "That may not sound very impressive," Thoman wrote in his Alaska and Arctic Climate Newsletter, before noting that the 2026 minimum is still nearly 15 percent lower than the minimum in any year before 2007.

The figure should be treated as preliminary until the National Snow and Ice Data Center, based at the University of Colorado Boulder, confirms it on its Sea Ice Today page. Thoman noted that Japan's space agency and the European OSI SAF sea ice index both showed a tentative minimum on Sept. 13, and that ice extent has grown since then in all three analyses.

A Middling Year on a Much Lower Baseline

Rankings can mislead without context. According to Thoman, the typical minimum extent in recent years is 34 percent below the early-1980s average, which is why an 11th-place finish now counts as an ordinary year.

NSIDC's sea ice analyses show how far the baseline has moved. The center has noted that since 2007, the Arctic minimum has dropped below 5 million square kilometers every year except 2009, 2013 and 2014, when it barely crossed that line, and that the minimum averaged 6.46 million square kilometers in the 1990s. The 2026 minimum is about 1.86 million square kilometers below that 1990s average, an area slightly larger than Alaska.

The spatial pattern has changed too. Thoman noted that both the Northern Sea Route along Russia's Arctic coast and the Northwest Passage through the Canadian Arctic islands were open in late summer, something that rarely happened in the 20th century. The ice edge north of the Franz Josef Land archipelago sat near 83 degrees north.

Why the Summer Minimum Has Plateaued

Since 2007, there has been no significant trend in the Arctic-wide September minimum. In 15 of those 20 years, the minimum has fallen between 4.1 and 4.8 million square kilometers, Thoman wrote. The record low, set in 2012, has not been broken.

The reasons are complex. Thoman pointed to long-term variations in ocean and atmospheric circulation, and to geography: ice at lower latitudes now largely melts away by early September, and what remains is mostly north of 76 degrees north, where strong solar heating lasts a shorter time each summer.

Regional trends differ. In the Asian Arctic seas, the Kara, Laptev and East Siberian, the five lowest minimums occurred between 2007 and 2020, and ice has recovered slightly in the past six years. In the Chukchi and Beaufort seas north of Alaska, the trend has been flat for 15 years without a sustained recovery. In the Atlantic Arctic, the minimum has kept declining since the 1990s.

A plateau is not a recovery. The minimums of the past two decades remain far below anything recorded before 2007, and year-to-year weather can easily mask the longer-term decline.

Winter Ice Set a Record Low Earlier This Year

The summer figure follows a record-setting winter. NSIDC reported in March that the 2026 Arctic winter maximum statistically tied 2025 for the smallest of the satellite era, according to Climate.us. "We've now had two years in a row with record-low winter maximum extents," NSIDC senior research scientist Walt Meier said, adding that such extents reinforce Arctic sea ice's significant long-term downward trend.

NSIDC director Mark Serreze cautioned at the time that there is no correlation between the winter maximum and the following summer minimum, which helps explain how a record-low winter was followed by a middling summer. The ice has also grown thinner over the decades, making it more vulnerable to melt and breakup.

Why It Matters from Alaska to the Lower 48

For Alaska, less sea ice means longer open-water seasons along the northern and western coasts. That can expose communities to fall storm surges and erosion without an ice buffer, change access for subsistence hunters, and open routes for shipping. Thinner, less extensive ice also affects walrus, polar bears, and ice seals that depend on it.

Farther south, the connections are real but indirect. Scientists study how Arctic warming may influence the jet stream and weather patterns in the mid-latitudes, though that link remains an active area of research with no settled consensus.

Monitoring itself has become a policy question. In early August, NOAA ended its support for the annual Arctic Report Card, which had been issued since 2006. Thoman, one of the report's three editors, wrote in his September newsletter update that the Report Card has found a new online home, with support from the American Geophysical Union, Climate.us, CU Boulder and the University of Alaska Fairbanks.

What happens next is a refreeze through autumn and winter, followed by next March's maximum. NSIDC's confirmation will settle the preliminary figure. The bottom line: 2026 was an ordinary year by modern Arctic standards, and that is exactly what makes it notable.

What Readers Want to Know

How low did Arctic sea ice get this year?

The preliminary minimum was 4.60 million square kilometers on Sept. 12, based on NSIDC data analyzed by Rick Thoman. The figure remains preliminary until NSIDC confirms it.

Where does 2026 rank?

It ties 2025 for the 11th lowest minimum since satellite records began in 1979.

Is an 11th-lowest ranking good news?

Not really. The 2026 minimum is nearly 15 percent lower than the minimum in any year before 2007, and typical minimums are now about a third below the early-1980s average.

Why hasn't the summer minimum set a new record since 2012?

The minimum has plateaued since 2007, partly because of circulation variability and because the remaining late-summer ice sits at high latitudes with shorter heating seasons. That is not a recovery.

What happened to winter sea ice this year?

NSIDC reported that the March 2026 maximum statistically tied 2025 for the smallest in the satellite record.

How does this affect Alaska?

Less ice can mean longer open-water seasons, more exposure to fall storms and erosion, changes for subsistence hunting, and effects on ice-dependent wildlife.