Spring (Late March to Mid-April) is the most popular and "high-density" season in Japan, primarily due to the world-famous Cherry Blossom (Sakura) bloom. During this window, the country experiences its highest influx of international tourists, and domestic "Hanami" (flower viewing) parties fill the parks. Hotels often reach 100% occupancy and prices can triple. The second most popular window is Autumn (October to November), known for the "Koyo" (vibrant red and gold maple leaves), which many seasoned travelers prefer over spring because the weather is more stable and the colors last longer than the fleeting cherry blossoms. In 2026, the "Golden Week" in early May remains the busiest time for domestic travel, while winter has seen a massive surge in popularity for the "Japanow" ski season in Hokkaido. If you want to avoid the heaviest crowds and highest prices, the "shoulder" months of May (post-Golden Week) and September are considered the best balance of good weather and manageable tourist volumes, allowing you to see the temples without being shoulder-to-shoulder with thousands of others.