Hokkaidō‘s temperature ranges from warm and pleasant in summer to subzero in winter. Spring and early summer can be wet and miserable. The hiking season runs from May through to October, with a peak in the July and August months when the leaves begin to change colour. Prices tend to be 20% to 30% higher during this time, and many of the popular areas will be booked solid. Typhoons, though rare in Hokkaidō, start to hit Japan in mid-August and can continue through to the end of October, causing train delays, power outages and even landslides. September and October are chilly, particularly in the mountains, and by November winter has come, bringing heavy snows and very cold temperatures. Bring plenty of layers and plan on bundling up.