The best time to go to Gassan Shizu Onsen is during the summer months, from late July to early September, or in winter from late December to March for snow activities.For those eager to experience the full grandeur of the area, summer is ideal. During this period, the Gassan Flower Line, a scenic driving route, is fully open, offering stunning views of alpine flora. It's the great time for hiking and exploring the natural beauty around the onsen, with trails leading to Mount Gassan's summit. This is particularly good for active couples and solo travellers who enjoy outdoor pursuits and fresh mountain air.Winter offers a completely different, yet equally captivating, experience. The region transforms into a snow-covered wonderland, making it excellent for winter sports enthusiasts. From late December to March, you can enjoy skiing and snowboarding in the nearby resorts.