Due to wildlife visibility and comfortable weather conditions for sightings, mid-May to mid-September is the best time to visit Alaska. Days are longer and warmer during the summer. The weather during this period is mostly pleasant but it can change quickly any time of the year, so pack a warm coat anyway. Crowded summer and early autumn are perfect for glacier cruises or for conquering Denali, Alaska's highest peak. In view of the frosty weather, tours usually stop in late September. October opens a season colder and darker days, and Alaska enters hibernation until April. However, November and December are perfect for ice skating or railroad trips. January to April can be a good idea if you are desperately longing for winter sports or Northern Lights watching. The period between May and June sees rising temperatures, awakening wildlife, and shoulder-season prices.