GREAT AMERICAN VACATION
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The best time to visit is June through August, when the weather is mildest (though you should still anticipate cool, wet, and sometimes stormy weather), daylight hours are longest, and the wildlife is most abundant. Because summer is so short, though, things happen fast, and seasonal activities may need to be crammed into just a couple of weeks.
Go birding in May and August, when migrants come through. The peak wildflower season is usually short, particularly in the Arctic, when most flowers may not blossom until mid-June and then go to seed by late July.
Salmon runs vary from region to region, so it's best to do your homework before choosing dates. For the most part, though, you're looking at July and August, which is also when the tundra starts turning from its summer hues to autumnal colors. The best times for bear viewing coincide with salmon runs.