Arctic sea ice extent, a measure of the ocean area in the northern hemisphere that is at least 15% sea ice, has trended down in past decades (NSIDC). The question will be suspended on 5 April 2026 and the outcome determined using graph data as provided by the National Snow & Ice Data Center's (NSIDC's) "Charctic Interactive Sea Ice Graph" at approximately 5:00PM ET on 6 April 2026 (Charctic Interactive Sea Ice Graph, click "Arctic" on the left side above the graph, NSIDC - About Charctic Data). The question will close as of the date of the highest reported Arctic sea ice extent (the most recent if there is a tie for the highest extent). Other site data are immaterial. As of the launch of this question, the highest daily reported Arctic sea ice extent in 2025 was 14.307 million sq. km on 22 March.

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