Narusawa Ice Cave

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Narusawa Ice Cave (Narusawa Hyoketsu) is a lava-tube cave near Lake Saiko, formed by Mount Fuji's ninth-century Jogan eruption. Inside, the temperature stays near freezing year-round, sustaining ice pillars and glassy walls even in high summer.

A designated Natural Monument, the cave once served as a natural refrigerator, storing ice and seeds, and today offers a short, atmospheric descent into Fuji's volcanic underworld.

Narusawa lets you walk inside a lava tube and see natural ice formations glinting in near-freezing air while it is sweltering outside, a memorable contrast and a glimpse of Fuji's volcanic power. Its historic use as an ice store adds interest.

Compact and easy to combine with the nearby Fugaku Wind Cave and Lake Saiko, it is a popular, refreshing stop.

The ring-shaped 150-metre cave passage, the seasonal ice pillars and the ice-lined chambers are the main highlights. The historic ice-storage area, once used to preserve silkworm eggs and food, is notable.

The low, narrow lava passages and the constant chill even in midsummer make the descent a highlight in itself.

Descend into the cave and follow the circular route past ice formations, ducking through the narrow lava passages. Learn about the cave's formation and its historic use as a natural refrigerator.

Combine the visit with the nearby Fugaku Wind Cave, walk the connecting Aokigahara forest path, and explore Lake Saiko's viewpoints and Iyashi-no-Sato village.

The seasonal ice pillars, thickest in spring, are the essential sight, along with the ice-store chamber. The low-ceilinged lava passages that require crouching are a memorable feature.

The short Aokigahara forest trail linking Narusawa to the Fugaku Wind Cave is a worthwhile add-on.

The quiet forest trail through the sea of trees between the ice and wind caves reveals moss-covered lava terrain few rushed visitors explore. Early or late visits avoid the tour-bus crowds inside the tight passages.

Interpretive displays reveal the cave's little-known role in Japan's silk industry as a cool egg store.

The cave's history as a natural refrigerator, used from the Edo period to store ice, food and later silkworm eggs, offers insight into pre-modern preservation. Interpretive signs explain this heritage.

Set on Fuji's sacred slopes and within the Aokigahara forest, the site connects to the region's volcanic and cultural landscape.

Narusawa is a product of Fuji's volcanism, a lava tube left by flowing molten rock, set within the dense Aokigahara forest that grew on the same eruption. The surrounding woodland offers short trails.

The cave's unique cold microclimate and ice formations showcase a remarkable natural phenomenon amid the forest.

Children enjoy the adventure of descending into the cave and ducking through the narrow, icy passages, a cool novelty in summer. The short route suits families with school-age children.

Combined with the nearby wind cave, forest walk and Lake Saiko attractions, it makes an engaging family outing.

Narusawa Ice Cave is a daytime natural attraction with no nightlife; it closes in the late afternoon. The forested area is quiet and remote after dark.

For evening dining and onsen, nearby Kawaguchiko offers restaurants, bars and hot-spring hotels a short drive away.

The illuminated ice pillars and glistening ice walls inside the cave make striking, if challenging, low-light shots. The narrow lava passages and the mossy forest trail outside offer atmospheric compositions.

Spring, when the ice is thickest, gives the most dramatic frozen scenes.

The cave formed during Mount Fuji's Jogan eruption in 864, when flowing lava left a hollow tube. From the Edo period it was used as a natural cold store for ice and food, and in the Meiji era for preserving silkworm eggs.

It was designated a National Natural Monument in 1929 for its geological significance.

The cave's role in the historic silk and ice trades ties it to the wider economy of old Yamanashi. Today it sits within the nature-tourism culture of the western Fuji lakes.

Hoto cuisine and Fuji reverence connect the surrounding area to the region's traditions.

Summer offers the most dramatic contrast, escaping the heat into near-freezing air, while spring is when the ice pillars are largest. The cave is refreshing on any warm day.

Winter visits are possible but less striking, and outdoor conditions can be icy; check seasonal hours before travelling.

Inside, the cave holds a near-constant temperature around freezing all year, so bring warm clothing even in summer. Outside, the forested highland is cool in summer and cold in winter.

Ice formations peak in spring and persist through summer; the surface forest paths can be muddy or icy after rain and snow.

The cave itself has no festivals, but the nearby Lake Saiko and Fuji Five Lakes area hold seasonal events, and the spring ice is a natural highlight. Iyashi-no-Sato nearby hosts craft events.

Check the Fuji Five Lakes tourism calendar for regional happenings when planning a visit.

Descend into the ice cave, follow the circular route past the ice pillars, then walk the short forest trail to the Fugaku Wind Cave. Combine both with Lake Saiko's Iyashi-no-Sato village.

Afterward, continue to Lake Kawaguchi for lunch, or explore the western lakes and viewpoints nearby.

The ice cave takes about 20 to 30 minutes to explore. Adding the forest trail and the Fugaku Wind Cave makes a one to one-and-a-half-hour outing.

Combined with Lake Saiko's attractions, it forms part of a half-day exploring the western Fuji area.

From Kawaguchiko Station, take the Fujikyu Retro Bus (green line) toward Saiko and the caves, about 30 to 40 minutes, alighting at the Narusawa Ice Cave stop. Some services continue to the wind cave.

By car, it is a short drive west of Kawaguchiko IC via prefectural roads, with a car park at the cave.

The cave is explored on foot along a fixed circular route with steps and low passages; sturdy footwear is essential. The nearby wind cave is reached by a short forest walk or a stop further on the bus.

A car or the Retro Bus links the caves to Lake Saiko and Kawaguchiko.

Kawaguchiko Station on the Fujikyuko Line is the nearest rail hub, connected to the cave by the green Retro Bus line. There is no station nearby.

Drivers use the Kawaguchiko interchange on the Chuo Expressway, then head west to the caves.

The cave generally opens daily around 9am and closes in the late afternoon, roughly 5pm, with seasonal variation. It may close or reduce hours in deep winter.

Check the Narusawa Ice Cave official site for current opening times before visiting.

Admission is around 350 yen for adults, with lower rates for children; a combined ticket with the Fugaku Wind Cave offers savings. Prices are modest.

Confirm current fees and combined-ticket options on the official site.

A small shop and cafe at the cave entrance sell snacks, drinks and souvenirs, and the nearby Saiko area has limited eateries serving soba and hoto. Iyanshi-no-Sato has village cafes.

For a fuller meal, nearby Kawaguchiko offers hoto restaurants and cafes a short drive away.

The regional staples are hoto pumpkin-and-noodle stew and soba made with clear local water. Grilled trout and Yamanashi fruit are local treats.

Koshu wine and seasonal produce complement a meal after the cool cave visit.

There is no lodging at the cave itself; the nearest options are Lake Saiko's campgrounds and pensions and Kawaguchiko's onsen ryokan and hotels. Camping is popular in the surrounding forest.

Staying in the Saiko or Kawaguchiko area makes a convenient base for the caves and western lakes.

A cave visit costs only about 350 yen, or a little more for a combined cave ticket, plus modest bus fares and snacks. It is a very affordable, refreshing stop.

Combined with the wind cave and free Saiko viewpoints, the western-lakes area offers excellent value.

The entrance shop sells cave-themed souvenirs, snacks and local products. Nearby Iyashi-no-Sato offers handmade crafts, and Kawaguchiko has a wider souvenir range.

Look for Yamanashi wine, fruit products and Fuji-themed gifts in the broader area.

The cave is cold, dark, wet and slippery, with low ceilings requiring crouching, so wear sturdy, non-slip shoes and watch your head and footing. It is not suitable for those with mobility issues or claustrophobia.

Bring warm clothing even in summer, and stay on marked forest paths outside, as Aokigahara is dense.

The cave involves steep steps, narrow, low passages and slippery, uneven ground, making it unsuitable for wheelchairs, strollers or those with limited mobility. There is no accessible route inside.

Visitors unable to enter can still enjoy the forest surroundings and nearby Lake Saiko viewpoints.

Some English signage explains the cave and its history, and the site is popular with international visitors, but staff may speak limited English. A translation app helps with tickets and details.

Basic Japanese greetings are appreciated by local staff.

Wear warm clothing and sturdy, non-slip shoes even in summer, as the cave is near freezing and slippery. Duck carefully through the low passages, and buy a combined ticket to add the nearby wind cave.

Visit in spring for the biggest ice pillars, come early to avoid tour crowds, and carry cash for the small fee.

Bring a warm layer or jacket even in summer, sturdy non-slip shoes, and cash for the entry fee and combined ticket. A light is provided but a phone torch helps.

Watch loose bags in the tight passages; a small daypack is easiest. Add rain gear for the forest trail.

Protect the fragile ice formations and cave environment by not touching them and carrying out all litter. Use the Retro Bus where possible, and keep strictly to marked paths in the surrounding Aokigahara forest.

Support local shops and the nearby craft village, and respect the site's protected Natural Monument status.

The Fugaku Wind Cave is a short forest walk away, and Lake Saiko with Iyashi-no-Sato and its viewpoints is close. Lakes Shoji and Motosu lie further west, and Kawaguchiko is a short drive east.

The Aokigahara forest surrounds the caves for guided walks.

The Narusawa Ice Cave official website and the Fuji Five Lakes tourism site provide opening hours, admission and combined-ticket details and access directions. The Kawaguchiko Station visitor centre offers maps and Retro Bus schedules.

Staff can advise on winter operation and combining the caves with Lake Saiko.

This section is being updated and will be available shortly.

This section is being updated and will be available shortly.