Kusatsu Onsen in Gunma: Regional Access, Nearby Attractions & Trip Planning

Where Kusatsu Sits in Gunma Prefecture

Kusatsu Onsen (草津温泉) sits at approximately 1,200 meters elevation in the mountainous northwest of Gunma Prefecture, tucked into the volcanic highlands around Mt. Kusatsu-Shirane. According to the Gunma Prefecture tourism site, it is one of the highest-altitude major onsen towns in Japan — the elevation keeps summers cool and winters snowy, making it a year-round destination.

The location is more remote than it appears on the map. Kusatsu is roughly 4 hours from central Tokyo by direct highway bus, and there is no train station in town — the nearest JR station is Naganohara-Kusatsuguchi (長野原草津口駅), which requires a further 30-40 minute bus ride to reach Kusatsu itself. This remoteness is part of the appeal: the town feels separated from the urban sprawl of the Kanto plain, surrounded by mountains and volcanic terrain.

What makes Kusatsu particularly interesting for hot spring enthusiasts is its position within Gunma's onsen network. Within an hour's drive, you can reach Manza Onsen (万座温泉) at 1,800 meters and Shima Onsen (島温泉) in a quieter river valley — each offering completely different water chemistry and bathing atmospheres. Kusatsu is the anchor of this network, but not the only destination worth visiting. For an overview of all these areas, see our Gunma onsen town destinations. For Kusatsu's history and national reputation, see our Kusatsu Onsen overview.

Getting to Kusatsu Onsen from Tokyo

Highway Bus from Shinjuku (Direct)

The most straightforward route is the JR Bus Kanto highway bus from Shinjuku Expressway Bus Terminal directly to Kusatsu Onsen. According to the JR Bus Kanto schedule, the journey takes approximately 4 hours and costs ¥4,200 (~$28) one way for adults (2025 rates).

Buses depart multiple times daily, with departures ranging from 7:00 to 20:00 depending on the season. Online reservation through JR Bus Kanto is recommended, particularly during peak periods — Golden Week, summer holidays, and winter weekends fill up.

The bus drops you directly in Kusatsu town, eliminating any need for transfers. For most visitors without a car, this is the simplest option.

Shinkansen and Local Train Route

The train route is faster in total travel time (2.5-3 hours) but more expensive and involves transfers:

1. JR Joetsu Shinkansen from Tokyo to Takasaki (approximately 50 minutes)
2. JR Agatsuma Line from Takasaki to Naganohara-Kusatsuguchi Station (approximately 80 minutes)
3. Bus from the station to Kusatsu Onsen (30-40 minutes, ¥1,000-1,500)

Total cost is approximately ¥8,000+ (~$53+) one way, significantly more than the direct bus. The train route makes sense if you have a Japan Rail Pass (which covers steps 1 and 2) or if you prefer trains to highway buses.

Route	Time	Cost	Notes
Highway bus from Shinjuku	~4 hours	¥4,200 (~$28)	Direct, no transfers
Shinkansen + Agatsuma Line + bus	~2.5-3 hours	~¥8,000+ (~$53+)	JR Pass covers train portions
Driving from Tokyo	~3 hours	Expressway tolls	Parking available in Kusatsu

For visitors driving, the route from Tokyo via the Kan-Etsu and Joshin-Etsu expressways takes approximately 3 hours. Parking is available at public lots in Kusatsu town.

Nearby Onsen Towns: Manza and Shima

Manza Onsen: Milky Sulfur Springs at 1,800m

Manza Onsen (万座温泉) sits at 1,800 meters on the slopes of Mt. Kusatsu-Shirane, approximately 30 minutes from Kusatsu by car or bus. According to the official Manza Onsen guide, the water here is distinctly different from Kusatsu — milky white and heavily sulfuric, compared to Kusatsu's clear, highly acidic springs.

The contrast makes a Kusatsu-Manza combination appealing: you soak in Kusatsu's sharp acidic waters (pH 2.0) one evening, then experience Manza's cloudy sulfur baths the next morning. The two create a genuine hot spring pairing that you cannot replicate by visiting either one alone.

Bus connections between Kusatsu and Manza exist but are infrequent — check schedules carefully. A car provides significantly more flexibility for this connection. For a detailed guide to Manza, see our Manza Onsen highland retreat.

Shima Onsen: Riverside Baths in a Quiet Valley

Shima Onsen (島温泉) lies approximately 40 kilometers from Kusatsu, roughly 1 hour by car via Route 353. According to the Shima Onsen official site, this is a quieter, more rustic onsen village set along a river valley — a stark contrast to Kusatsu's bustling town center.

Shima's appeal is its calm. The village has riverside outdoor baths, small ryokan, and very few tourists compared to Kusatsu. It works well as a detour on the way to or from Kusatsu, particularly if you are driving.

Note that in winter, heavy snow can affect the mountain roads between Kusatsu and Shima. Check road conditions before attempting this route between November and March.

Combining Kusatsu with a Gunma Onsen Itinerary

Gunma Prefecture has one of the densest concentrations of distinct onsen towns in Japan. A multi-day itinerary through the region lets you experience dramatically different hot spring waters within short distances.

Sample 2-3 Day Gunma Onsen Itinerary

2-Day Kusatsu + Manza

• Day 1: Tokyo → Kusatsu (highway bus, 4 hours). Explore town, soak in yubatake-area baths. Overnight in Kusatsu.
• Day 2: Kusatsu → Manza Onsen (30 min by car/bus). Soak in sulfur springs. Return to Tokyo via Kusatsu or Naganohara-Kusatsuguchi.

3-Day Gunma Onsen Loop

• Day 1: Tokyo → Kusatsu. Town exploration and evening bathing.
• Day 2: Kusatsu → Manza Onsen (morning soak) → Shima Onsen (afternoon, 1.5 hours via Kusatsu). Overnight at Shima.
• Day 3: Shima → Minakami area (Takaragawa or Hoshi Onsen) → Tokyo.

The 3-day loop requires a car for practical connections between towns. Without a car, the 2-day Kusatsu + Manza combination is more realistic using bus connections.

For the walking experience within Kusatsu town itself, see our Kusatsu town travel guide. For riverside bathing in Minakami, see our Takaragawa Onsen in Minakami guide, and for a historic single-ryokan experience, see our Hoshi Onsen experience.

Seasonal Highlights for Kusatsu in Gunma

Kusatsu's elevation makes it a genuine four-season destination, with each period offering a different reason to visit.

Season	Highlights	Notes
Winter (Dec-Mar)	Snow-covered yubatake, skiing at Kusatsu Kokusai Ski Resort	Heavy snow may affect bus schedules; book accommodation early for New Year
Spring (Apr-May)	Cherry blossoms arrive late at elevation, quieter crowds	Pleasant temperatures for walking; snow melting on upper mountains
Summer (Jun-Aug)	Cool highland escape from Tokyo heat, hiking Mt. Shirane	Temperatures 10-15°C cooler than Tokyo; popular weekend escape
Autumn (Sep-Nov)	Mountain foliage, warm baths in crisp air	October peak for leaf colors in the highlands

Winter is arguably the most atmospheric season — the steam rising from the yubatake against a backdrop of snow creates the classic Kusatsu scene. However, winter also brings the most logistical challenges: bus services may run on reduced schedules, and mountain roads to Manza and Shima can close due to snow.

Summer is the most practical season for combining multiple Gunma onsen towns in a single trip, with reliable road conditions and extended daylight hours for travel between destinations.

Frequently Asked Questions

How long does it take to get to Kusatsu Onsen from Tokyo?

The direct highway bus from Shinjuku takes approximately 4 hours and costs ¥4,200 (~$28) one way. The train route via Shinkansen and Agatsuma Line takes 2.5-3 hours but costs around ¥8,000+ (~$53+). Driving from Tokyo takes approximately 3 hours via expressway. The highway bus is the most popular option for visitors without a car.

Can I visit both Kusatsu and Manza Onsen in one trip?

Yes. Manza Onsen is approximately 30 minutes from Kusatsu by car or bus. The most practical approach is to overnight at one and day-trip to the other. Bus connections exist but are infrequent — a car provides significantly more flexibility. The two offer contrasting water types (Kusatsu's clear acidic vs Manza's milky sulfur), making the combination worthwhile.

Is it easy to get to Kusatsu without a car?

Yes, for Kusatsu itself. The direct highway bus from Shinjuku runs multiple times daily, and the bus from JR Naganohara-Kusatsuguchi Station takes 30-40 minutes. However, combining Kusatsu with nearby onsen towns like Manza or Shima without a car requires careful bus planning, as connections are infrequent. A car is recommended for multi-town itineraries.

What is the best season to visit Kusatsu Onsen?

Each season has its appeal. Winter (December-March) offers snow-covered yubatake scenery and skiing at Kusatsu Kokusai Ski Resort. Summer provides a cool highland escape from Tokyo's heat. Autumn (October-November) brings mountain foliage. Year-round, the hot springs are the main draw. Note that heavy snow between November and March may affect bus schedules and mountain road access to nearby onsen towns.