Knowing the time and place will greatly improve one’s odds. Sperm and Humpback whales are most active during the winter months in Dominica and Hawaii, respectively. Humpbacks are also found during the spring and summer months around the waters of New England, Nova Scotia, Newfoundland and Alaska. Spring is also a great time to witness the Gray Whale migration off the west coast of North America. Killer whales can be seen during mid Spring to late Autumn in the Pacific Northwest during the salmon runs.