There are two main approaches to Oze National Park: one from the south through Gunma Prefecture and one from the north through Fukushima Prefecture. For visitors coming from Tokyo, the approach through Gunma Prefecture is much more convenient.
From Tokyo via Gunma Prefecture
There are three major trailheads on the Gunma side of Oze:
Most popular is the Hatomachitoge trailhead because of its proximity to the marshland, a one hour walk away. The road to Hatomachitoge is closed to private vehicles during the peak seasons (daily from late May through July and from mid September to mid October and on weekends during August and the first half of September). Shuttle buses operate to Hatomachitoge from Tokura (900 yen one way), where there are several large parking lots and bus connections to/from Numata and Tokyo. No public transportation is provided to Hatomachitoge outside of the above mentioned peak seasons.
The second most popular trailhead is the Oshimizu trailhead because of its proximity to the pond, a two hour walk away. In contrast to the road to Hatomachitoge, the road to Oshimizu remains open to private vehicles during the entire hiking season. Many buses from Numata and Tokyo run all the way to the Oshimizu trailhead between mid May and mid October (the others terminate at Tokura).
The third trailhead, the Fujimi-shita trailhead is the least popular, because it is not convenient for accessing either the marshland or the pond. The road to the trailhead remains open to private vehicles during the entire hiking season, and there are only very few bus connections per day between the trailhead and Tokura from mid May to mid October.
By train and bus
From Tokyo, three types of trains can be used to reach Oze National Park: the JR Joetsu Shinkansen to Jomo Kogen Station (around 75 minutes, about 5500 yen, 1 train per hour), the Minakami limited express train to Numata Station (around 2 hours, about 4000 yen, 3 trains per day) or local trains to Numata Station (around 2.5 hours, 2520 yen, one transfer at Takasaki Station). All of the above trains are covered by the Japan Rail Pass and JR East Pass.
From Numata Station, there is at least one bus per hour to Tokura (80 minutes, 2100 yen), with many continuing on to the Oshimizu trailhead (95 minutes, 2200 yen). Only a few of the buses also serve the shinkansen station, Jomo Kogen Station (110 minutes, 2450 yen to Tokura or 120 minutes, 2600 yen to Oshimizu). For access to Hatomachitoge, change to a shuttle bus at Tokura.
By direct bus
From late May to mid October, Kanetsu Kotsu operates three highway buses per day between Tokyo (JR Shinjuku Highway Bus Terminal near the New South Exit) and Oze (one terminates at Tokura, two continue to Oshimizu). The one way journey takes about four hours and costs 3700 yen, while a round trip ticket is available for 7000 yen.
By rental car
Rental cars can be acquired at Jomo Kogen Station, Numata Station and Takasaki Station. A rental car allows travelers to combine the trip to Oze with other sites, such as Minakami Onsen or Nikko, which is only 30 kilometers away along National Route 120. There is no public transportation available along the road between Oze and Nikko, and the road gets closed in winter.
From Fukushima Prefecture
When approaching the park from the north, the Numayamatoge trailhead is most convenient for accessing Ozenuma Pond (about a one hour walk away), while the Miike trailhead is most convenient for accessing Ozegahara Marshland (about a two hour walk away). A bus connects both trailheads from Aizu-Tajima Station on the Aizu Railway Line (around 2.5 hours and 2500 yen, 4 buses per day).
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