A Guide to Hiking Ozegahara, Gunma's High Altitude Marshland

The marsh sits at the heart of Oze National Park and has been designated a Special Natural Monument. Each season brings a different landscape: white skunk cabbage (mizubasho) blooms in late spring, yellow alpine flowers cover the marsh in summer, and autumn transforms the scenery with fiery red foliage. The trails are typically open from May to October, closing during winter under heavy snow. In early mornings, mist clings to the pools, lifting slowly as the sun climbs behind the surrounding peaks—a quiet spectacle that feels far removed from Japan’s busy cities.

Oze also holds an important place in Japan’s environmental history. In the 1950s, local opposition to a proposed hydroelectric dam on the nearby Tadami River sparked a nationwide conservation movement. The campaign ultimately protected the area from overdevelopment and helped lay the foundations for Japan’s modern environmental laws. Today, strict rules—such as staying on the boardwalks, carrying out all waste, and limiting overnight numbers—help preserve the fragile ecosystem for future generations.

Most hikers begin at Oze Dai-ichi Parking Lot in Tokura, where you can transfer to a shuttle up to Hatomachitoge. It’s a simple process—buy your ticket at the vending machine (cash only) and board the shared bus. The winding drive climbs steadily into the mountains, trading roadside villages for forests of Japanese beech and larch.

Once at Hatomachitoge, check in at LUCY Ozehatomachi, a convenient lodge right by the trailhead. Before settling in, stop next door at the Hatomachi Base Café & Shop to try the local specialty, hanamame (flower bean) soft-serve ice cream. The shop also stocks hiking gear, snacks, and souvenirs. Dinner is usually a hearty mountain-style meal—think steaming bowls of tonjiru (pork and miso soup) with rice and local vegetables—perfect fuel to prepare for the next day's hike (there are also stay plans without meals). If the skies are clear, a short evening stroll may reward you with a sky scattered with stars, unspoiled by city glow.

Dawn comes quickly in the mountains. By 6:00 a.m., the first hikers are already lacing up boots and grabbing breakfast from LUCY’s 24-hour self-service shop, which sells everything from inari sushi to energy bars. Card and cashless payments are available. Larger bags can be stowed in lockers, leaving you free to set out with just a daypack.

The recommended route is from Hatomachitoge to Yamanohana, then on to Ryugu crossroads and back, covering about 7.7 km. The trail includes some gradual slopes with boardwalks to protect the marshlands. From Hatomachitoge, the trail dips through the quiet forest before opening out toward Yamanohana, the first viewpoint on the trail. The Yamanohana Visitor Center is a good spot for a short rest, a bathroom break, a chance to refill your water bottle, and look at seasonal flora displays before pressing on toward the marsh. Take in the beautiful views of Mt. Shibutsu before continuing along boardwalks toward the heart of the wetlands.

Boardwalks stretch out across the wetlands, guiding you over pools of clear water and clusters of wildflowers. In May and June, the white blossoms of mizubasho cover the ground, and water lilies adorn the ponds; in autumn, the grasses and surrounding forests glow with red and gold hues. Dragonflies skim the water’s surface, and if you’re lucky, you might spot a Japanese stoat darting between the reeds.

The boardwalks curve around a hill known as Ushikubi, halfway between Yamanohana and Ryugu. Just before reaching it, you will see a large pond called Sakasa Hiuchi, which means "upside-down Mt. Hiuchi." There are benches where you can rest and enjoy the view of Mt. Hiuchi reflected in the water. The mountain has traces of snow on its upper reaches, even in June. Near Ushikubi, the boardwalks fork in two directions. Take the right fork to reach Ryugu, a crossroads where many hikers pause for a break to enjoy the views of the mountains and the quaint wooden Ryugu Hut. The return route retraces your steps, with a gentle climb back toward Hatomachitoge.

By late morning, you will be back at LUCY in time for lunch. When you are ready to go, you can buy a bus ticket from the machine at Hatomachi Base Café & Shop before collecting any luggage and heading to the bus stop.

* Access: From Tokyo, take the Joetsu Shinkansen to Jomo-Kogen Station (about 70 minutes), then a Kan-etsu Kotsu bus to Tokura (about 2 hours), and finally a shuttle bus to Hatomachitoge (35 minutes). There are also direct buses from Shinjuku. For more details, read How to Get to Oze.
* Resthouses and Toilets: Facilities are available along the trail. A 100-yen contribution is requested for toilet use to support regular maintenance; the café toilet is 200 yen.
* Best Seasons: Mid-May to June for mizubasho, July to August for alpine flowers, late September to October for autumn leaves. The trails are closed in winter.
* Food & Supplies: Meals and snacks are available at LUCY Ozehatomachi and the Base Café, but it’s wise to bring your own trail snacks and water bottle.
* Packing Essentials: Waterproof hiking shoes, layered clothing, rain gear, and insect repellent in summer, and a bell to ward off bears.

Trails are well-maintained, but the wooden boardwalks can be slippery in wet weather. The elevated boardwalks are designed to protect the delicate flora from damage, so stay on the boardwalks and avoid straying into the marsh. Keep to the right side as you walk. You may also see mountain porters carrying supplies across the marsh—step aside to give them the right of way. Take all trash with you, and respect the “leave no trace” principles.

You may come across hikers wearing bells to alert bears to their presence, as bears typically avoid human contact. Bears are most active around dawn and dusk, but sightings are rare. If you see a bear, remain calm, and it will likely amble away. You can buy bells at Hatomachi Base Café & Shop.

Even in summer, mornings at this altitude can be brisk, and conditions can shift quickly from clear skies to sudden showers. Check weather forecasts before setting out, and be sure to bring a jacket and rain gear.

How to Get to Oze