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 (1000 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 Ozenuma 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.
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/hour), the Joetsu/Hokuriku Shinkansen to Takasaki followed by a local train ride to Numata Station (around 2 hours, about 5000 yen) or local trains all the way to Numata Station (around 2.5 hours, 2640 yen, one transfer at Takasaki). All of the above trains are covered by the Japan Rail Pass, JR Tokyo Wide Pass, JR East Nagano Niigata Area Pass and JR East Tohoku Area 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, 2300 yen). Only a few of the buses also serve the shinkansen station, Jomo Kogen Station (110 minutes, 2500 yen to Tokura or 120 minutes, 2700 yen to Oshimizu). For 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 (including one overnight bus) between Tokyo (Busta Shinjuku) and Oze (Tokura and Oshimizu). The ride takes about four hours and costs 3900 or 4400 yen one way depending on the day of travel.
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.
From early June to late October (June 3 to October 29, 2023), there are infrequent bus connections between Nikko and Oze. The buses operate between Yumoto Onsen in Okunikko and Kamada at the entrance to Oze. The one way ride takes one hour and costs 1950 yen.
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 from Aizukogen Oze-guchi Station on the Aizu Railway Line runs via the Miike trailhead to the Numayamatoge trailhead (2 hours, 2450 yen, 4 buses per day from May through October).