Mt Ishiwari (石割山)

Mt Ishiwari (石割山 Ishiwari-yama) is a mountain right next to Lake Yamanaka-ko, and its close proximity to Mt Fuji makes for some excellent scenery if the weather is in your favour. With good public transport access via a direct bus from Shinjuku to the trailhead, Mt Ishiwari can be climbed as a 10km day hike which should take just under 5 hours. Mt Ishiwari is also known for being a 100 Famous Mountain of Yamanashi.

With an elevation of 1413m, it can also be climbed in colder months, although I would double-check the trail conditions on YAMAP before climbing. Generally, the highest likelihood of snow is in February, and then there may be some snow on either side of that in January and March.

I last climbed Mt Ishiwari in mid-January of 2024 with a couple of friends, and we began our hike just after 10am. The very first hurdle you’ll face is a very long, soul-crushing staircase. This is probably the toughest part of the course, so once you’re past this it’s a relatively easy hike.

We saw some people doing the hike in the reverse direction, possibly so that they get to go down these stairs instead of up. The overall elevation gain is still going to be the same and so I don’t think one way is better than the other - it depends how much you hate stairs!

Both ends of the trail have an onsen too, so maybe you could make your choice on which onsen you’d prefer, or if there’s a specific restaurant you want to visit at the end of the trail.

The next point you’ll pass in the course is Ishiwari Shrine, which features a large cracked rock you can pass through.

For those who aren’t too tired out from the stairs, it’s said that if you do three loops around the shrine and pass through this rock, you will be granted good luck. I prayed for a good 2024 hiking year without any injuries.

After under 2 hours of hiking, and fairly soon after the shrine, you’ll reach the peak of Mt Ishiwari (石割山). Mt Fuji was a little bit shy behind the clouds today, but it wasn’t a bad view! From here we have two more peaks to pass through before we begin our descent back to the lake.

It was pretty windy and cold at the summit so we decided to continue on without having too much of a break. From here, there’s quite a steep (and a little muddy) trail downwards. There’s a rope you can hold onto for most of it though, which makes things a little easier.

After the descent and then a little bit more of a climb, you’ll reach the second peak, Mt Hirao (平尾山), again with excellent views of Mt Fuji. We decided to take our lunch break here, although the winds kept us pretty chilled. I’ve recently started bringing my burner along to hikes but the strong winds today foiled my efforts to try and properly boil some water.

The weather forecast for the evening was snow (in Tokyo as well!) so as we started our descent the skies started to become a bit cloudier. There’s some stretches of flat trail here, with the opportunity to see Mt Fuji looming before you, if you are lucky.

Finally we reach our third and final summit for the day, Mt Ohira (大平山). Even with the clouds, Mt Fuji still makes for a beautiful sight.

The trail continues a little bit more, with a final bit of descent through the forest before you’re out onto the road back towards Lake Yamanaka-ko.

As we reached the lake, we noticed there were two photographers who were feeding the swans (with bird pellets). I’m not too sure if you are supposed to be doing this, but the pair seemed quite knowledgeable about the birds and the swans seemed very used to humans.

Although we didn’t get a 100% clear view of Mt Fuji today, being able to take some photos up close with these birds was one of the highlights of today’s hike!

From Lake Yamanaka-ko, you can find a couple of restaurants if you’re looking for dinner. I stopped by the nearby Benifuji no Yu onsen. After a good soak, I hopped on my bus back to Shinjuku.

Hiking course details

Public transport access with example schedule

You will need to book your bus in advance via highwaybus.com. I recommend doing this a week in advance if you can, as the first bus departing from Shinjuku tends to become fully booked.

The bus terminal (or Busta) at Shinjuku station is accessible via its south exit. It can be a little hard to find if you’ve never been there before, and it’s also on the third floor of the building. So I would make sure to plan in enough time between getting off the train and transferring to the bus terminal.

Once you arrive at Yamanaka-ko, you will have about 6.5 hours to do your hike, which should be plenty of time, with maybe the option to squeeze in an onsen visit as well.

Unfortunately due to the tourism around Kagaguchi-ko, the buses can become a little bit delayed in getting home. An alternative option if you wanted to be more flexible on time is to go to Kawaguchi-ko after your hike, from which there are trains you can get home on instead. (Although note that the express trains back to Tokyo also tend to book out!)

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