Route Overview
Nagano’s Prefectural Route 20, also known as the Kaidakogen-Fukushima Line, runs through the scenic Kaidakogen Highlands in the Kiso region.
This route is famous for offering majestic views of Mt. Ontake (elevation 3,067 m), one of Japan’s iconic standalone peaks.
Due to its location at a climatic boundary, the mountain often hides behind clouds, earning a reputation as a “shy mountain.”
Still, on clear days, it appears in full glory — especially from the Ontake Viewpoint along this road.
Recommended Section
The most scenic portion stretches from central Kaidakogen to the Ontake Viewpoint area.
This segment winds gently through fields and birch forests, with stunning views of Mt. Ontake emerging on the horizon when weather permits.
Clear mornings in autumn or sunny winter days provide the best chances to see the mountain.
Road Conditions & Safety
The road is generally well-paved and moderately wide.
However, due to the high elevation, riders should be cautious of fog and potential frost, especially in the early morning or after rain.
Traffic is light, making for a pleasant ride, but wild animals may occasionally cross the road.
Suggested Stopovers
Viewpoint: Ontake Viewpoint (benches, no fee)
Local Spot: Kaidakogen Ice Cream Workshop (handmade soft serve)
Roadside Station: Michi-no-Eki Kiso Uma no Sato (souvenirs, restrooms)
Local Food: Soba with pickled radish (sunkizuke), grilled corn, and handmade buckwheat noodles
Fees & Rentals
Route 20 is completely toll-free.
Rental motorcycles are available in nearby towns such as Shiojiri or Kiso-Fukushima (advance reservation required, around ¥5,000/day).
Best Season & Climate
The best touring season is June to early October.
Summer is cool and refreshing, while autumn brings vibrant foliage and crisp mountain air.
From November to April, snow and ice may make riding dangerous or impossible.
Dining & Rest Spots
Kaidakogen has charming cafes and eateries offering local soba and seasonal vegetables.
Near Kiso Uma no Sato, you’ll also find relaxing spots to rest and enjoy views of the pastures and horses.
Sample Touring Plans
Day Trip: Kiso-Fukushima → Route 20 → Ontake Viewpoint → Kiso Uma no Sato → exit via Shiojiri (approx. 4 hours)
Overnight Trip: Stay in Kaidakogen → Next day ride to Nomugitoge or Norikura Highlands
Access
To reach Kaidakogen, drive about 1.5 hours from the Ina IC or Nakatsugawa IC on the Chuo Expressway.
The nearest station is JR Kiso-Fukushima, about 30–40 minutes by bike from the highland.
Some rental bike services may be available near the station (check in advance).