Distance: 15.8 km
Elevation change: 1140 metres
Highest point: 2640 metres
Start: Midori-no-ike Bus Stop
Finish: Shibunoyu Bus Stop
Map: Yama to Kogen Chizu 山と高原地図 ［No.33 八ヶ岳 YATSUGA-TAKE］
Enjoy Some of Yatsugatake Best Hiking
This hike is almost a reverse offering of my previous trip to Yatsugatake a couple of years back, with difference being this time starting a little way up the mountain chain. Though daily distances seem short, the Yatsugatake terrain shouldn’t be underestimated and weather conditions are also highly changeable.
Day 1: Take a Soak in Japan’s Highest Hot Spring (5 km)
From Tokyo the only realistic option to make the first morning bus at 09:23 from Koumi Station is to take the Hokuriku-Shinkansen from Omiya to Sakudaira Station. From Sakudaira you’ll need to transfer to the Koumi Line which takes a further 45 minutes. Everything going well, the train and bus connections should time nicely. The bus is actually headed for Inagoyu Hot Spring 稲子湯 but tell the driver you want to get off at the Lake Midori bus stop みどり池入口 (one stop before, 780 yen). The start of the trail is well sign posted and you have a choice of either walking along road or following shortcuts which bypass some sections of road. Look out for a sign to Midori-ike on your left side. The hike initially passes through some delightful lowland forest before kicking into steeper action for the final 40-minute push up to the lake. Take lunch on the roughhewn benches overlooking Lake Midori with vistas of Yatsugatake augmenting the fine scenery.
When you’re ready to head off continue along the trail beside the lake. A little further down the trail forks, look for a sign pointing to Honzawa Onsen 本澤温泉. In the early summer watch for Japanese primrose (Kurinsou) coming into bloom. This section of the hike is otherwise unremarkable and an hour or so after leaving the lake you’ll arrive at a 4WD drive track where you need to turn right for a 10-minute walk up to the campsite. The Honzawa Onsen campground (600 yen) is spacious, has a water hole and on this particular weekday I was luckily the only camper. Honzawa Onsen’s claim to fame is it holds the distinction of hosting the highest open-air bath (rotenburo) in Japan at 2,150 metres! After setting up camp take a well-deserved soak in the sulphur infused waters. Make sure to pack a small towel.
Day 2: A Campsite with 360 Degree Views (5.8 km)
A flat camping site makes all the difference and after a restful night’s sleep, I arose to find Yatsugatake cloaked in a heavy mist. I decided to make an early start and by 07:00 was on my way. The trail (Shiransuna Shindo 白砂新道) up to Tengudake starts from behind the mountain lodge and becomes progressively steeper with a couple of slightly exposed sections to deal with before hitting the upper ridgeline. The mist and wind conditions at the top were significant, reducing visibility to around 30 metres. Even in bad weather following the path is relatively straightforward and it takes 20 minutes to reach the East Tengu peak 東天狗岳 (2,640 m). In better weather most climbers make a short detour over to the west peak but under the circumstances there wasn’t much point. There are two options getting down to the Kuroyuridaira Plain 黒百合平 with the left trail scrambling through a rock field and being somewhat more taxing.
After taking an early lunch break at the Kuroyuri Hyutte 黒百合ヒュッテ next to its rather forlorn looking campsite, take a short walk to Nakayama-toge 中山峠. Turn left here for another brief climb up to Nakayama 中山 (2,496 m). From here down to the Takamiishi hut 高見石小屋 the trail is akin to following a dry river bed so pay careful attention to your footwork. The campsite (550 yen) while quite small, is significantly nicer than at Kuroyuri Hyutte and behind the hut is a rocky outcrop with superb 360 degree views. Note that while this campsite doesn’t have a water hole you are provided with 2 complimentary litres and it costs 50 yen a litre thereafter.
Day 3: Scramble Down an Extensive Boulder Field (5 km)
The final day down to the Shibunoyu 渋の湯 can be challenging, not so much from a navigational standpoint but requires negotiating an extensive boulder field. Similar to the trail coming off Tengudake suggested map travel times here are tight and I would advise giving yourself extra time. Apart from the busiest times of the year, there are also only two daily buses back to Chino Station 茅野 (1,150 yen). On your ventures through the boulder field keep an eye on the red and white spots painted onto the rocks. In other sections the route is indicated by pink tape. Importantly, if you encounter heavy rain the option exists to avoid a major stream crossing by means of a lesser used course about half way along.