Hakone and Owakudani: Volcanic Valley

Ride the Hakone Ropeway to Owakudani, a steaming volcanic valley famous for black eggs, Mount Fuji views and a lively Hakone day trip.

Published October 16, 2026 at 11:09 PM JST | By Tokyo Paul

Quick answer: Owakudani is a volcanic valley in Hakone formed about 3,000 years ago, famous for kuro-tamago, eggs boiled in hot spring water until their shells turn black. Most visitors arrive on the Hakone Ropeway, which can be suspended when volcanic gas levels are high.

Steam, Sulfur and Fuji Views

Autumn is a rewarding season to head up into the mountains of Hakone, because crisp air can give Mount Fuji a better chance of showing itself above the hills. At the top of the sightseeing route sits Owakudani, a volcanic valley where steam drifts from the ground and the air carries a faint smell of sulfur. It is also the home of the kuro-tamago, the black egg that has become one of Hakone's best-known snacks.

This guide explains how the valley formed, why the eggs turn black, how to get there by ropeway, and what to know about volcanic gas and safety. It also looks at how Owakudani fits into a wider day in Hakone, with its hot springs, lake cruises and art museums, so you can plan a visit with confidence.

How Owakudani Was Born

Owakudani is a volcanic valley in Hakone, in Kanagawa Prefecture, formed around 3,000 years ago by an explosion of the Hakone volcano. The Hakone Ropeway describes it as a place shaped by the Kamiyama crater, with barren ground that still emits steam and volcanic gas. The name means "Great Boiling Valley," and the ropeway's information says the valley was known by another name, Daijigoku, until it was renamed Owakudani in 1873.

Today the valley sits inside the Fuji-Hakone-Izu National Park area, a region known for hot springs, mountain scenery and views of Mount Fuji. Active vents and hot spring water give the valley its distinctive look, with bare, steaming slopes that contrast with the green mountains around it. It is a vivid reminder that Hakone's famous onsen come from real volcanic activity beneath the ground.

The Famous Black Eggs

Kuro-tamago are ordinary chicken eggs that are cooked in the hot spring water of Owakudani, which turns the shells black. According to Japanese tourism sources, the sulfur and iron in the water cause the color change. Local lore says that eating one adds seven years to your life, a charming saying that visitors often repeat while peeling their eggs.

Visitors can buy the eggs at the Owakudani Station dining hall, on the second floor of the station, and at the Kurotamagokan shop near the station. The dining hall also serves Owakudani curry and katsu curry, and the station store sells original goods that are available only there. The egg-boiling site itself is a different matter. Since the 2015 volcanic activity, the walking trail to it has been closed to individual travelers, and as of autumn 2026 the most recent reports say that access is only by a guided tour requiring advance reservation. Eggs are not sold at the boiling site, and the situation can change, so check the official ropeway website before you go.

Riding the Ropeway Safely

The most memorable way to reach Owakudani is the Hakone Ropeway, which covers about four kilometers in around 24 minutes and sends gondolas out every minute. The ride passes over the valley, with the volcanic floor roughly 130 meters below between Sounzan and Owakudani, and on clear days there are views of Mount Fuji and Lake Ashi. The route continues down to the lakeside, where the evening lights can be seen from the gondola.

It helps to know a little of the recent history. The valley was closed in May 2015 because of volcanic activity and reopened in part on April 27, 2016, and visitors have not been able to walk close to the steaming vents since then. Local shops have turned the black egg into souvenirs of all kinds, including bean-jam manju shaped like eggs and cookies, which are easy to carry home. In the town below, the Hakone Tozan Cable Car carries passengers up to Sounzan, where the ropeway begins.

The ropeway is not the only way up. Visitors can also reach the valley by bus from stations such as Odawara, Hakone-Yumoto and Kowakidani, which is useful if the gondolas are not running. The ropeway's own pages note that the route takes in views of the valley floor, Lake Ashi and, on clear days, Mount Fuji, which rises 3,776 meters. At Owakudani Station an observatory overlooks the volcanic landscape, so even a short stop offers a good look at the steaming slopes.

Operating hours vary by season, with shorter days in winter, and the ropeway runs daily throughout the year. Service can be suspended when volcanic activity or gas concentrations reach unsafe levels, so checking the operator's website on the day of your visit is the most reliable way to avoid disappointment.

The valley's gases include sulfur dioxide and hydrogen sulfide, and the ropeway operator provides clear guidance for visitors. People with allergic asthma, bronchial or pulmonary conditions, heart disease or a pacemaker, or who are not feeling well, are asked not to board the ropeway between Sounzan and Ubako stations. In rare cases the gas may cause asthma-like symptoms in sensitive people, including pregnant women, infants and the elderly, and the operator offers wet hand towels for covering the nose and mouth.

The operator also provides a four-language pamphlet, emergency kits with oxygen and wet towels in the gondolas, and first-aid offices at each station. These precautions are practical rather than alarming, and most visitors enjoy the area without difficulty. Still, if you or a family member are sensitive, consider an alternative route such as visiting other parts of Hakone and following staff advice. Dress in layers, since the mountains can be cooler and windier than the town below, and bring a light rain jacket.

Making It a Full Hakone Day

Hakone is a town in Kanagawa Prefecture known for hot springs, Lake Ashi and its art museums, and it is home to around 11,000 residents. Decorated pirate-style ships cross the lake, the Hakone Tozan Line climbs from Odawara toward Gora, and the Odakyu line connects Odawara to Shinjuku in about 70 minutes. The Hakone Free Pass offers unlimited rides on most local transport for several days and is sold at stations including Shinjuku and Odawara. Attractions include the Hakone Open-Air Museum and the Pola Museum of Art, and the historic Hakone Checkpoint recalls the Edo-period highway.

Quick Takeaways

Owakudani offers a rare chance to stand beside an active volcanic landscape and taste a quirky regional snack. Check the ropeway status before you go, read the health guidance, and be ready for changing weather. A black egg with a view of Fuji is a simple pleasure that fits neatly into a Hakone day.

Pair the valley with a lake cruise, a museum or a soak in a hot spring, and the trip becomes a well-rounded getaway from Tokyo.

Frequently Asked Questions

Why are Owakudani eggs black?

The eggs are cooked in the valley's hot spring water, and the sulfur and iron in the water turn the shells black. Local lore says that eating one adds seven years to your life, though this is a saying rather than a fact.

Can you walk to the egg-boiling site?

Since volcanic activity in 2015, the trail has been closed to individual visitors, and recent reports say access is by guided tour with advance reservation. Eggs are sold at Owakudani Station rather than at the boiling site, so check the ropeway website for updates.

Is Owakudani safe for people with breathing problems?

The ropeway operator advises that people with allergic asthma, lung or heart disease, or a pacemaker should not board the ropeway between Sounzan and Ubako stations. Service may also be suspended when gas levels are high, so check the operator before you travel.

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