Mt. Kurofu

Mt. Kurofu2,404 mGunma

100 Mountains of Flowers100 Mountains of Gunma

🚃 Reachable by public transport · Day trip · Easy · a relaxed hike

Easy

Stamina1/10

TechnicalA well-maintained trail Official

Trail time 2h 14mestimatedDistance 5.16 kmmeasuredTotal ascent ↑435 mmeasuredHighest point 2,393 m

📍 Distance, ascent and trail time are for the route shown on the map. (of 2 routes; others differ in difficulty)

Access ease Moderate

Gateway station Sakudaira Station / Komoro Station, Shinjuku Station → Trailhead Asama Trailhead / Karuizawa Pass, Takamine Kogen Hotel-mae

2 public-transport routes ・ One way ¥3,100

🔍 Find similar mountains →

“bk” = data from books (being replaced with our own measurements). Distance, ascent and trail time are measured/estimated from the map route.

Mt. Kurofu (黒斑山) is the highest peak of the first outer-rim of Mt. Asama, straddling the border of Gunma and Nagano Prefectures.
The approach from Kurumazaka-toge (Takamine Kogen) is the shortest, and from the outer-rim ridge you can see the crater area of Mt. Asama, Mt. Yatsugatake, and even the Northern Alps in good conditions.
The course is well-maintained, popular as a step-up for beginners in summer, and as an introduction to snow mountains with crampons / wakan / snowshoes in winter.

The trailheads are two: “Mt. Asama Trailhead,” which has Asama Sanso etc. along the course, and “In front of Takamine Kogen Hotel,” which has Takamine Onsen etc.

Timetable last checked: May 22, 2026

Mt. Asama Eruption Alert Level 2 (crater-area regulation)

Mt. Asama is at Eruption Alert Level 2, so entry within approximately 2km of the crater is prohibited. The trail from the Sai-no-Kawara junction to Mt. Maekake is in the regulated area and not passable. Mt. Kurofu (the Omote course / Naka course from Kurumazaka-toge) is outside the regulated area and climbable.

Latest info: JMA Mt. Asama activity status

How to access the trailheads

[Outbound] Sakudaira Station / Komoro Station → Mt. Asama Trailhead / Kurumazaka-toge (Takamine Kogen Hotel-mae)
[Outbound] Shinjuku Station → Takamine Kogen Hotel-mae
[Return] Kurumazaka-toge (Takamine Kogen Hotel-mae) / Mt. Asama Trailhead → Sakudaira Station / Komoro Station
[Return] Takamine Kogen Hotel-mae → Shinjuku Station

Hiking Course Details — Mt. Kurofu

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Map & Recommended Route — Mt. Kurofu

1. [Outbound] Sakudaira Station / Komoro Station → Mt. Asama Trailhead / Kurumazaka-toge (Takamine Kogen Hotel-mae)

From Sakudaira Station on the Hokuriku Shinkansen or Komoro Station, board the JR Bus Kanto “Takamine Kogen Line” and get off at Mt. Asama Trailhead or Kurumazaka-toge (Takamine Kogen Hotel-mae)

Travel time: about 54–59 minutes from Sakudaira Station
Fare: Sakudaira Station → Takamine Kogen Hotel-mae ¥1,380 | Komoro Station → Takamine Kogen Hotel-mae ¥1,050
2 services per day. IC cards accepted.
Operation: year-round

Bus TimetableSakudaira Station / Komoro Station to Mt. Asama Trailhead / Kurumazaka-toge (Takamine Kogen Hotel-mae)

Sakudaira Station	Komoro Station	Mt. Asama Trailhead	Kurumazaka-toge (Takamine Kogen Hotel-mae)
8:35	8:53	9:10	9:29
13:22	13:45	14:02	14:21

Reference: JR Bus

2. [Outbound] Shinjuku Station → Takamine Kogen Hotel-mae

From Shinjuku Station New South Exit “Busta Shinjuku,” board the JR Bus “Shinjuku ~ Saku / Komoro / Takamine Kogen” line and get off at “Takamine Kogen Hotel-mae.”
Travel time: about 3 hours 46 minutes
Fare: ¥3,100 (online reservation ¥2,980) | early discount ¥2,950 (online reservation ¥2,830)
1 service per day. Reservation system, Wi-Fi available.
Operation: year-round

Bus TimetableShinjuku Station to Takamine Kogen Hotel-mae Bus Timetable

Shinjuku Station	Takamine Kogen Hotel-mae
10:35	14:21

Reference: JR Bus

3. [Return] Kurumazaka-toge (Takamine Kogen Hotel-mae) / Mt. Asama Trailhead → Sakudaira Station / Komoro Station

From Kurumazaka-toge (Takamine Kogen Hotel-mae) or “Mt. Asama Trailhead,” board the JR Bus Takamine Kogen Line toward Sakudaira Station and get off at JR Sakudaira Station or Komoro Station.

Travel time: about 58–70 minutes from Takamine Kogen Hotel-mae to Sakudaira Station
Fare: Takamine Kogen Hotel-mae → Sakudaira Station ¥1,380 | Takamine Kogen Hotel-mae → Komoro Station ¥1,050
2 services per day.
Operation: year-round

Bus TimetableMt. Asama Trailhead to Sakudaira Station / Komoro Station Bus Timetable

Kurumazaka-toge (Takamine Kogen Hotel-mae)	Mt. Asama Trailhead	Komoro Station	Sakudaira Station
10:02	10:20	10:42	11:00
16:20	16:38	17:10	17:30

Reference: JR Bus

4. [Return] Takamine Kogen Hotel-mae → Shinjuku Station

From “Takamine Kogen Hotel-mae,” board the JR Bus “Shinjuku ~ Saku / Komoro / Takamine Kogen” line and get off at the terminus, Shinjuku Station New South Exit “Busta Shinjuku.”

Travel time: about 3 hours 57 minutes
Fare: ¥3,100 (online reservation ¥2,980)
1 service per day.