Alaska was covered by glaciers during the Great Ice Age (Pleistocene).
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USGS Frequently Asked Questions

Question: Alaska was covered by glaciers during the Great Ice Age (Pleistocene).

Answer:

No - interior Alaska was a grassland refuge habitat for a number of plant and animal species during the maximum glaciation.

Source of this FAQ:
http://ak.water.usgs.gov/glaciology/FAQ.htm

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