I climbed Mt. Jonen, 2857m (9373 ft), in the Japan Alps on October 11. It was just before the trail`s peak is covered by snow (usually snow falls before Oct 11, but this year snowfall was late because of global warming).
It is a 8-9 hour hike, so you can possibly go on a one-day hike from early morning if the condition is not bad.
After walking up a long trail enjoying the beautiful fall foliage, suddenly the famous Mt. Yari, 3180 m (10433 ft), came in to my sight, at Jonen-Nokkoshi. It was an amazing experience.
Then I left my rucksack by the side of the Jonen Hut and climbed up to the summit of Mt. Jonen (a one and half hour tougher hike than expected).
It was a perfectly sunny day.
At the top, I could see most of the mountains of Japan Alps and Mt Fuji.
See this blog in the website “Explore Azumino!” about the access to the trailhead to Mt. Jonen.