"Wondering about the best time to go whale watching in Hawaii? Your best bet will be to go either at the end of the calendar year, or right at the start. “Humpback whales migrate back to Hawaii every year to mate and give birth and are only here during the winter months—December to April—with a few eager whales showing up as early as October and some stragglers staying through May,” according to Toni Colombo, a Lahaina local who owns and operates Hawaii Ocean Rafting with her husband Peter."