Tanzania can be visited throughout the year, but the best time depends on your interests. The dry season, from June to October, is ideal for wildlife viewing and is the best time to witness the Great Migration. The green season, from November to March, offers lush landscapes and the wildebeest calving season. April and May are the months of long rains; during this time, there are fewer tourists and the scenery is vibrant, although some areas may be harder to access.