Ikaho Onsen, Mizusawa & Haruna Guide 2026: A Gunma Highlands Two Days

Ikaho is Gunma’s other great hot spring — quieter in reputation than Kusatsu, but with a streetscape that has become an icon in its own right: a stone stairway of 365 steps climbing straight up the mountainside, lined the whole way with wooden inns, bathhouses and old-fashioned games halls. Just below it sits the temple-and-udon hamlet of Mizusawa, and above it rises the sacred Mount Haruna with its caldera lake. This guide covers all three and explains how to read them as an unhurried, culture-minded two days.

At a glance: 2 days, 1 night · best in late spring through autumn (cool, green highlands) · budget roughly ¥20,000–38,000 per person for an overnight stay with two meals and travel from Tokyo · for travellers who want history, temples and mountain scenery over nightlife · base the night on the Ikaho stone steps.

Ikaho and its stone steps

The spine of Ikaho is the ishidan-gai, the stone-step street: 365 steps rising up the slope, with the town’s “golden water” running in a glass-covered channel alongside. The number was chosen so the town’s fortunes would thrive every day of the year. The present arrangement dates to the late sixteenth century, laid out to organise the flow of the spring water down the mountain, and it remains one of Japan’s classic retro spa streetscapes — especially atmospheric in the evening when the lanterns come on and bathers in yukata drift between the inns.

At the top of the steps stands Ikaho Shrine, the town’s thousand-year-old guardian shrine, long associated with hot-spring healing and with matchmaking and safe childbirth. From near the summit, a short cable car — the Ikaho Ropeway — rises to a hilltop deck with views over the town, the Haruna massif and, on clear days, far across the Kanto plain (open roughly 09:00–17:00; around ¥830 round trip, approx., 2026).

Ikaho has two distinct waters: the iron-brown kogane-no-yu, “golden water,” which oxidises to a rusty colour in the air and is the town’s historic spring, and a clear shirogane-no-yu, “white water,” developed more recently. Many inns offer both.

Mizusawa: the temple and the udon

A few minutes downhill from Ikaho lies Mizusawa, famous for two things that have gone together for centuries. Mizusawa Kannon (Mizusawa-dera) is the sixteenth temple of the Bando pilgrimage of thirty-three Kannon temples, said to have been founded some 1,300 years ago; its grounds hold a fine two-storey gate and an unusual hexagonal rotating sutra hall, whose central column of scriptures you turn for blessings as you circle it (open roughly 08:00–17:00; free).

The pilgrims who came to the Kannon needed feeding, and so Mizusawa udon was born — thick, glossy, hand-cut wheat noodles with a firm, springy bite, counted among Japan’s three great udon and traditionally served cold with two dips, soy-based and sesame. A cluster of historic udon houses lines the temple road; Tamaruya, which traces its founding back some four hundred years, is the senior name, with the neighbouring Shimizuya a well-regarded alternative (note differing closing days — Tamaruya typically Wednesdays, Shimizuya Tuesdays; approx., 2026).

The full timed route linking Ikaho, Mizusawa and Haruna, with hours and journey times for each stop, is our Ikaho and Haruna heritage itinerary.

Mount Haruna: the restored shrine and the caldera lake

Above Ikaho rises Mount Haruna, a dormant volcano whose crater holds a still caldera lake. The mountain’s spiritual heart is Haruna Shrine, founded more than 1,400 years ago: a long approach winds half a mile up a wooded gorge past waterfalls, weathered rock formations and seven small halls before reaching the main shrine, set dramatically against a towering pinnacle of rock. The richly carved buildings, many of them Important Cultural Properties, emerged at the end of 2025 from an eight-year restoration, so the colours and carving are freshly renewed — a good moment to visit. The cryptomeria-lined walk in is as much the experience as the shrine itself.

Higher up lies Lake Haruna, the caldera lake at around 1,100 metres, with the symmetrical cone of Haruna-fuji rising from its shore. It is a cool highland retreat in summer, with rowing boats and a lakeside path, and a quiet frozen world in winter. The Mount Haruna Ropeway lifts from the shore to the summit of Haruna-fuji in a few minutes for a long view across the plain (open roughly 09:00–17:00; around ¥1,100 round trip, approx., 2026 — note a roughly one-week maintenance closure usually around February–March).

Getting there and getting around

From Tokyo, take the Joetsu or Hokuriku Shinkansen or the limited express to Takasaki, then change for the local line to Shibukawa Station; buses run from Shibukawa up to Ikaho in about 25 minutes. Total travel time is roughly two hours. For the second day on Mount Haruna, a car or the seasonal bus is genuinely useful, since the shrine, lake and ropeway are spread around the mountain and the connecting roads wind. Bring layers — the lake and shrine sit high and stay cool even in summer.

Where to stay

Stay on the stone steps so you are in the lantern-lit town in the evening. Long-established inns such as Hotel Kogure draw abundantly on both the golden and white waters, with large baths and valley views; a room with two meals lets you bathe in both waters and walk the steps after dark. Note that some inns schedule maintenance in the quieter early months and the town occasionally suspends the spring supply on scattered cleaning dates, so reconfirm bathing arrangements when you book.

Best time to visit and practical tips

Ikaho is comfortable year-round, but the highlands above it shape the seasons. Spring brings cherry blossom to the lower town and fresh green to Haruna; early summer is cool and quiet; autumn lights the gorge approach to Haruna Shrine and the slopes around Lake Haruna in colour, and is arguably the best window of all. Winter is cold and can be snowy on the mountain roads, though the town itself stays accessible and the baths are at their most welcome. If the Haruna Shrine restoration and its freshly renewed carvings are a draw, 2026 is an ideal year to come, with the spring anniversary festival around April 1–8 adding ceremony to a visit.

A few practical notes: the climb up the 365 steps is genuinely steep, so pace yourself and use the small footbaths along the way. Wear shoes you can slip off easily, since you will be in and out of baths and tatami rooms. Carry some cash, as the smaller udon houses and communal baths may not take cards. And remember that the golden water stains lightly, so rinse and avoid your best white towels.

FAQ

How do you get from Tokyo to Ikaho Onsen? Take a train to Takasaki, change for the local line to Shibukawa Station, then a bus up to Ikaho (about 25 minutes). The whole trip is roughly two hours. Direct highway buses from Tokyo also run in season.

What is Mizusawa udon and where do you eat it? Mizusawa udon is a thick, springy hand-cut wheat noodle eaten by pilgrims to the Mizusawa Kannon temple for centuries, usually served cold with soy and sesame dips. A cluster of historic udon houses lines the temple road below Ikaho; Tamaruya and Shimizuya are the best-known.

Is Haruna Shrine worth the climb? Yes. The half-mile approach up a wooded gorge past waterfalls and rock formations is a highlight in itself, and the main hall is set spectacularly against a rock pinnacle. The buildings were freshly restored at the end of 2025, so they are looking their best in 2026.

Can you combine Ikaho and Kusatsu in one trip? You can, but they are about 90 minutes apart by road and each deserves its own overnight. If you have three or four days, pairing them works well; for a single night, choose one and explore its surroundings rather than rushing between both.

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