Oirase Gorge in Autumn 2026: When to Go, What to Walk, Buses and Lake Towada

Aomori · Towada · Oirase Stream · Lake Towada · Hakkoda

By Nobu · sources checked 16 October 2026 · a researched guide · Sources at the end

The Oirase stream runs for about 14 km out of Lake Towada in Aomori, with a walking path beside it from end to end that joins the road in places. The leaves usually turn first at the top, near the lake, from mid-October, and the lower stream around Yakeyama usually keeps its colour into early November. Below are walking times for each section, the 2026 bus and boat dates, and two day plans that fit them. One change this year: the private-car restriction on the gorge road was held in September instead of late October.

The stream drops about 200 m in 14 km, from 400 m at Nenokuchi to 200 m at Yakeyama. The gradient is gentle, but it is still a long walk on a natural path that turns muddy after rain. JR buses stop at nine points along Route 102 beside it: get off at one stop, walk any section, and get back on further along.

When do the leaves turn at Oirase Gorge?

Aomori Prefecture’s map text says the colour begins on the Hakkoda summits in late September and takes about a month to reach the stream. Usual timings in the gorge, from the Towada Oirase Tourism Organization:

2026 update: on 13 October 2026 the Hakkoda Ropeway reported the summit leaves fallen and the foot of the mountain at 40%. We found no 2026 Oirase colour report on towadako.or.jp (Towadako National Park Association), its blog or towada.travel when we checked on 16 October 2026. Our live koyo tracker adds forecasts as they publish.

If I had to pick dates without any forecast, I would aim for the last ten days of October, and move down the stream if the top is past its best.

Once you have dates, check rooms around Lake Towada and Oirase on Booking.com if you want to start walking early, and check each property’s location (see Where to stay below).

Who is Oirase for, and when to skip it?

The Oirase stream section by section

Distances and walking times from the Oirase ecotourism project’s 2026 walking map, top to bottom:

For Ishigedo to Nenokuchi, the project’s walking page says about 2.5 hours, its FAQ 3–4 hours; the map’s times add up to 3 hours 5 minutes. I would plan on 3 hours plus stops. The Oirase Field Museum, run by Aomori Prefecture’s road division, recommends walking upstream, from Yakeyama towards the lake, so that the water comes towards you and the forest is backlit.

The Towada caldera formed about 15,000 years ago; later its rim gave way and a flood from the lake carved the valley (Field Museum). Prefecture map text says the lake has long evened out the flow, and with a drop of only 1 m in every 70 m, moss and shrubs grow even on small rocks and fallen trees in the river. Since 2013 the Bryological Society of Japan has listed Oirase as one of its “precious moss forests of Japan”, with more than 300 species recorded.

Nenokuchi: where the lake becomes a river

Nenokuchi is the outlet of Lake Towada, with a bus stop, a boat pier and a rental-bike counter. A sluice gate here lets a set flow into the stream in the daytime; at night and in winter it is almost closed, and the stream runs lower, mainly on its side streams (prefecture map text).

Usual colour: from mid-October, the first part of the gorge to turn. Access: Nenokuchi bus stop or the boat from Yasumiya.

Choshi Otaki

Choshi Otaki is the only waterfall across the main stream: 7 m high and 20 m wide. Prefecture text says it stopped fish swimming up into the lake, hence its other name, Uodome-no-taki, “the fall that stops the fish”. It has its own bus stop, so you can see it with little walking.

Access: Choshi Otaki bus stop; 1.5 km from Nenokuchi.

Kumoi Falls

Kumoi Falls comes off a cliff in the forest in three steps, 20 m in all. Side falls slowly wear back into the cliff; Kumoi carries more water than the others, so it has worn much further back, prefecture map text says.

Access: Kumoi-no-taki bus stop, beside the road. The nearest public toilet upstream is at Tamadare, about 500 m from the Kumoi-no-nagare stop towards the lake (project FAQ).

Ashura-no-nagare

Ashura-no-nagare, between Kumoi Falls and Makadoiwa, is the stretch prefecture text says “can be said to represent Oirase”: fast water pushing between rocks under thick trees. The Field Museum notes that much of the middle section runs beside the road and is the busiest part of the gorge. I would walk it early; on the Hachinohe plan below you reach it around midday, the busiest time.

Access: between the Kumoi-no-taki and Makadoiwa stops, 1.5 km apart.

Ishigedo

Kedo is local dialect for a hut, so Ishigedo is the “stone hut”: a large rock propped up by a katsura tree beside the path. It has the gorge’s only rest house, and the official highlight section up to Nenokuchi starts here.

Access: Ishigedo bus stop. The rest house has no car park, the operator says.

Yakeyama and the Oirase Keiryu-kan

The bottom of the gorge is Yakeyama, where the Tsuta River joins. The Oirase Keiryu-kan here is the visitor centre, with exhibits, a nature-guide desk, a shop and a cafe. Before you set off, ask at the guide desk whether any part of the path is closed that day. The prefecture’s inspection of the whole path on 24 April 2026 found one collapse and “no serious hazards”. Usual colour: into early November.

Other stops:

Hours, toilets and bikes

How do you get to Oirase Gorge?

From Tokyo

Take the Tohoku Shinkansen to Hachinohe, 2 hours 49 minutes on the Hayabusa 1 (JR East’s October 2026 timetable; times differ on some days, so check yours), then the JR bus. From Shin-Aomori the only bus towards the lake leaves at 11:50 and reaches Ishigedo at 14:07, too late for a long walk.

The JR buses: Oirase-go and Mizuumi-go

The Oirase-go runs from Hachinohe Station (west exit), the Mizuumi-go from Aomori over the Hakkoda mountains; both serve the gorge stops and end at Yasumiya. Key 2026 autumn times:

Shorter runs between Yakeyama and Yasumiya fill the gaps. IC cards are accepted; there is no toilet on board, but the long runs stop for 5–10 minutes. Every stop and time is in JR Bus Tohoku’s 2026 timetable (PDF).

Rail passes: the JR East Pass and the Japan Rail Pass are valid on these buses; the two South Hokkaido rail passes are not (JR Bus Tohoku).

After the autumn timetable:

• JR buses: the Aomori line stops serving the gorge and the lake from 12 November 2026 and runs only to Sukayu Onsen until 31 March 2027; the Hachinohe line stops from 18 November (JR Bus Tohoku).
• Local bus: Towada Kanko Dentetsu’s bus from Towada city reaches the Oirase Keiryu-kan at Yakeyama several times a day on weekdays (timetable as of 1 October 2026). On Saturdays, Sundays and holidays only one bus goes in (arriving 15:51) and the only one back leaves at 8:54, so a same-day return is not possible.
• The path: snow closes it from late December to mid-April, the Field Museum says.

Can you drive through Oirase Gorge in autumn 2026?

Yes. Aomori Prefecture and the Oirase ecotourism project have trialled closing Route 102 through the gorge to private cars since 2003, to protect the forest and ease traffic. Recent dates:

No second, autumn restriction was listed on the prefecture or project pages when we checked on 16 October 2026. When no restriction is in place, private cars can use the road, so check for updates before driving. The project’s parking and driving times (to the gorge and Lake Towada area):

• Park: free car parks by the Oirase Keiryu Onsen ski area at Yakeyama (340 spaces), or paid car parks at Yasumiya (640 spaces)
• Kosaka interchange: about 40 minutes
• Towada interchange: about 50 minutes
• Hachinohe-nishi smart interchange: about 1 hour
• Aomori city, over the Hakkoda–Towada Gold Line: 1.5–2 hours

With a car, park at Yakeyama, walk up and take a “down the gorge” bus that serves the Oirase Keiryu Onsen stop (not the 8:15).

A bypass is planned to take cars out of the gorge

Japan’s transport ministry (MLIT) is building the Oirase (Aobunayama) bypass, 5.2 km from Aobunayama to Nenokuchi, to take traffic around the gorge; work on the main tunnel began in June 2025. Aomori Prefecture plans year-round vehicle restrictions on the gorge section of Route 102 once it opens, turning the gorge into what it calls the “Oirase Natural History Museum”, centred on people walking. That is a project name, not a building or the Oirase Field Museum website quoted above. The prefecture already uses it for the private-car restriction week, and billed the full closure on 13 September 2026 as a one-day taste of that future. No opening date was given on the pages we checked.

Lake Towada by boat, and what is near the pier

Lake Towada is a caldera lake, 327 m at its deepest point and the third-deepest in Japan, the operator says. The sightseeing boat crosses from Yasumiya, the main lakeside village, to Nenokuchi in about 50 minutes.

Near the Yasumiya pier:

One-day plans that fit the 2026 timetable

Plan A: from Hachinohe (or a long day from Tokyo), until 17 November

The train times are examples from JR East’s October 2026 timetable, not confirmed for November; check both trains for your date before you book the bus.

The 16:15 bus leaves 4.5 hours after you start, enough even at the FAQ’s 3–4 hours. To add the lake you must reach Nenokuchi by about 14:40 (the 2.5-hour pace, no long stops), until 11 November: the 14:50 bus to Yasumiya (15:05, ¥720), then the Oirase 24 from there at 16:00 (¥3,050 to Hachinohe).

Without a car restriction the road can be busy on fine weekends, and 48 minutes between the bus and the train is not much slack; a night in Hachinohe is safer. In poor weather, shorten the walk: get off at Kumoi-no-nagare (11:54) and walk the top 4.2 km on the 2026 map to Nenokuchi, about 90 minutes.

Plan B: from Aomori, with the boat (until 5 November)

You have about 3 hours 45 minutes to reach the 13:30 boat: comfortable at the map’s 3 hours, too tight at the FAQ’s 4. If things change:

• Boat cancelled: if you hear in time to catch it, take the 13:30 bus from Nenokuchi instead (Yasumiya 13:45, ¥720) and keep the rest of the plan; you still have over an hour at Yasumiya before the 15:00 bus. If you miss it, use the buses below.
• Missed the boat or that bus: buses go straight back to Aomori from Nenokuchi at 14:00, 14:45 and 15:15 (Aomori 16:29, 17:14 and 17:44; ¥3,060; all until 11 November).

With a night at the lake: take the 9:30 boat from Yasumiya to Nenokuchi (10:20) and walk down to Ishigedo for a late lunch; from there the 15:34 bus goes to Aomori (until 11 November) and the 16:34 to Hachinohe. You walk downstream, against the Field Museum’s advice, but you catch the morning boat. If Oirase is one stop on a longer trip, our 5-day Tohoku itinerary shows where it fits.

How cold is it, and what should you wear?

The Japan Meteorological Agency station at Yasumiya on the lake, 414 m up and about the height of the top of the gorge, has 1991–2020 normals of an average daily high of 15.1°C and low of 6.5°C in October (152.5 mm of rain), and 8.2°C and 0.9°C in November (127.5 mm).

Late-October afternoons are usually cooler than that average high, and November mornings can be near freezing. For October and November the Field Museum advises a thick fleece or down jacket, a knit hat, gloves and rainwear, and waterproof walking shoes because the path gets muddy after rain. Our guide to what to wear in Japan in November has a fuller list.

More autumn in Tohoku: Naruko Gorge in Miyagi and Yamadera in Yamagata. Closer to Tokyo, see Nikko’s autumn leaves.

Where to stay for Oirase and Lake Towada

A night near the gorge lets you start walking early; you still need the bus for the leg you do not walk.

Questions travellers ask