Next edition — Dec 26–27, Dec 30–31, 2026; Jan 1–3, Jan 9–11, Jan 16–17, Jan 22–24, Jan 29–31, Feb 5–7, Feb 10–14, Feb 19–23, 2027 (CONFIRMED)
Zao's snow monsters are Aomori firs buried in rime around the Zao Ropeway's upper stations, 1,331–1,661 m up, above the hot-spring town of Zao Onsen in Yamagata. They begin forming in November and peak in February. Non-skiers ride up by day, or after dark on light-up evenings from late December to late February. Sleep in Zao Onsen for the night rides: the last bus to Yamagata leaves at 19:50.
How the date is set — Zao Ropeway publishes a calendar of light-up evenings ahead of each winter; the 2026–27 one went up on 4 October 2026 and lists 31 evenings between 26 December 2026 and 23 February 2027, 17:00–21:00, almost all of them Fridays, weekends and public holidays. Daytime rides to the trees run through the winter, weather permitting.
How often it runs — Every winter. The trees grow through January, are at their largest in February, and thin and collapse from March as the air warms and rain falls.
Goes first — Saturday nights on the light-up calendar, above all in February, when the rime is at its largest. Then the holiday runs: 30 December–3 January, 9–11 January, 10–14 February and 19–23 February 2027.
Act by — Now. The 2026–27 light-up calendar is out, so hold a cancellable room in Zao Onsen for your evening before you book the Night Cruiser tour.
Zao Ropeway posted the season's 31 light-up evenings on 4 October 2026.
Zao Ropeway — “Juhyo light-up notice and 2026–27 flyer (posted 4 October 2026)” — https://zaoropeway.co.jp/winter/info_detail.php?q=4217 (read 2026-11-03)
A sold-out listing may reopen after a cancellation or an additional room release. 空きウォッチ Aki checks Rakuten Travel for new openings, so you can act when one appears.
Watch the rooms — free, no account
North-west winds from Siberia pick up moisture over the Sea of Japan, drop snow on the Asahi range, then rise again over Zao. Inside those clouds, droplets stay liquid below zero until they strike a branch and freeze into feathery 'shrimp tails' that point into the wind. Snow packs into the gaps and hardens, again and again, until each Aomori fir vanishes inside its own frozen shell.
The ropeway's own guide charts the year: the coating starts in November and December, the tails lengthen through January, and February brings the biggest monsters. In March they melt thin, and rain can bring them down all at once.
On light-up evenings the ropeway runs again from 17:00. The lower line climbs 464 m in seven minutes to Juhyo Kogen, at 1,331 m. There you change to the Sancho line, a funitel of 18-seat gondolas slung between paired cables, built to sway less in strong wind, for ten minutes to Jizo Sancho at 1,661 m. Coloured light picks out the frozen shapes along the line.
The Night Cruiser is the other way in. The heated snow-cat leaves Juhyo Kogen, crawls uphill beside the Sancho line to its fourth pylon and turns back: about half an hour on the snow, without reaching the summit station.
Zao Onsen's water is strongly acidic sulphur spring, pH 1.25 to 1.6, at 45–66°C from the source; the town calls it the most acidic in Tohoku. Three communal bathhouses, Kamiyu, Shimoyu and Kawarayu, open from 6:00 to 22:00, and adults drop ¥300 in the box. On a light-up night that means you can ride down at 21:00 and still soak before they close.
Lodgings run from ryokan to pensions and lodges spread through the town, and the bus terminal is about ten minutes on foot from the ropeway. Check the walk from your door to the base station before you book: on a light-up night you make it twice, in the dark.
Anyone can ride; you do not need to ski. On light-up evenings the ropeway sells a return from Zao Sanroku to Jizo Sancho, and the Night Cruiser snow-cat tour is booked online only. Skis and snowboards stay behind at night, and groups of 20 or more must reserve.
Watching for free — Not from the ground: the trees stand around the ropeway's upper stations, so seeing them close up means a ride, and at night you see them only from the cabins and in and around the stations.
How hard it actually is — Zao Onsen is the one base where you can ride down at 21:00 and walk to your bed and a bath; its lodgings run from ryokan and hotels to pensions and minshuku. Yamagata city is 40 minutes away by bus, but the last bus leaves Zao Onsen at 19:50, before the light-up ends. 空きウォッチ Aki checks rooms listed on Rakuten Travel in its Yamagata–Zao search area: Zao Onsen, Yamagata city, Tendo and Kaminoyama.
What a night costs — The 2026–27 light-up ride costs ¥4,600 per adult (¥2,300 for ages 6–11); the Night Cruiser tour is ¥8,000. The bus from Yamagata is ¥1,200 each way. Hot-spring inns in Zao Onsen add Yamagata City's bathing tax of ¥150 per person per night; the city's planned 3% accommodation tax starts only on 1 April 2027, after the light-up season.
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