The best time to go to Otaki, Nagano Prefecture, Japan, is from late spring to early autumn, specifically from May to October, to make the most of the outdoor activities and pleasant weather.For those keen on hiking and exploring the natural beauty, May to early July offers comfortable temperatures and lush greenery, great for walks around the Ontake Kogen highlands or visiting the various waterfalls. The weather is generally mild, making it ideal for outdoor adventures without the intense heat of mid-summer.Late September to October is another excellent period, especially for those who appreciate autumn foliage. The mountainsides transform into a spectacular display of reds, oranges, and yellows. The air is crisp, and it's a fantastic time for scenic drives or gentle strolls to admire the colourful landscapes.