Records concentrate heavily on the North Slope, with more scattered reports from Yukon Delta National Wildlife Refuge and Arctic National Wildlife Refuge. That’s treeless tundra and coastline, essentially the whole of this fox’s US range, since Alaska is the only state where it occurs at all.
Foxes here den on raised tundra banks and rocky slopes that a family can reuse for generations, hunting lemmings and voles inland and switching to seabirds, eggs, fish, and scavenged carrion along the coast. Extra food gets cached under stones for the leaner stretches, and a pair may raise more or fewer pups from one year to the next depending entirely on how the lemming cycle is running.
Records climb sharply through May and June before falling off for the rest of the year. That spike lines up with pups first appearing above ground at dens, not a true summer population surge.
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