April begins as the end of winter. You might see the northern lights and there may be enough snow for winter sports. By the end of the month, it's nearly spring.
Alaska Travel Guide
Best Time to Visit Alaska - When to Travel to Alaska — Handpicked Alaska
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Alaska in April: A Complete Guide to Visiting in Spring
11 Things To Do In Alaska In April (During Spring Time)
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Best Time to Visit Alaska - Weather, Wildlife & Daylight by Month
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The best time to cruise Alaska - The Points Guy