The best time to visit Newfoundland for wildlife viewing is during the summer months, particularly from May through September. This period offers comfortable weather and the opportunity to see a variety of wildlife, including whales and seabirds like puffins. The peak season for whale watching in Witless Bay extends from mid-June to mid-August, while Twillingate's peak starts in mid-August. During the summer, you can also witness the capelin rolling, which attracts whales close to the shore, enhancing the whale-watching experience.