Kassengoya

Kassengoya (合戦小屋) is a mountain rest hut located at approximately 2,350 m on the Kassen Ridge (合戦尾根) of the Northern Japan Alps, in Azumino City, Nagano Prefecture, Japan. It sits on the Omote-Ginza traverse route connecting Nakabusa Onsen with the Jōnen mountain range, about four hours from the Mt. Tsubakuro trailhead and roughly ninety minutes below Enzanso. Unlike a full mountain lodge, Kassengoya does not offer overnight accommodation; it functions as a rest stop and shop providing meals, drinks, fruit, and sundries to hikers. It is operated by Enzanso Co., Ltd. (株式会社燕山荘), the company that also runs Enzanso, Arimineso, Daitenso, Hutte Nishidake, and Hutte Otake. The hut is best known for two signature items: watermelon (suika) and udon noodles. Watermelon is sold from late June to mid-September, with Matsumoto-Hata-grown melons appearing from early July, and udon is served from mid-June to November 3. The menu also includes pork miso soup (tonjiru), oden, cup ramen, oshiruko, coffee, hot milk, canned beer, water, and juice, along with original merchandise such as tenugui towels and badges. The hut operates seasonally, typically from late April to late November, with daily operation during the summer peak and weekend-only operation in the shoulder seasons. A small tent site with space for three tents is available at ¥2,000 per person, and a simple toilet is on site; there is no water source, so water is sold in bottles. Kassengoya is part of the Enzanso Group, a family-run mountain lodge business founded in 1921 when Chihiro Akanuma built the original "Tsubame no Koya" on Mt. Tsubakuro. The group has operated Kassengoya for decades and installed a cargo cableway from Nakabusa to the hut in 1964. The hut is a well-known landmark on the Omote-Ginza route and has been featured in regional food media, including a 2026 article by JA Nagano Chūōkai's web magazine about tasty Nagano foods enjoyed at mountain huts.

Kassengoya is a mountain rest hut on the Kassen Ridge of the Northern Japan Alps, in Azumino City, Nagano Prefecture. It is located on the Omote-Ginza traverse route that connects Nakabusa Onsen with the Jōnen mountain range, at an elevation of about 2,350 m. The hut does not offer overnight stays; it provides meals, drinks, and goods for hikers. It is operated by Enzanso Co., Ltd. (株式会社燕山荘), a company founded in 1921 when Chihiro Akanuma built the original 'Tsubame no Koya' on Mt. Tsubakuro. The company was renamed Enzanso in 1928 and incorporated in 1934. Over the decades, Enzanso expanded its operations to include several mountain lodges, and Kassengoya became part of its portfolio. A significant development for Kassengoya was the installation of a cargo cableway from the mountain foot to the hut in 1964 (Showa 39), which improved supply logistics. The hut has since served as a rest stop for climbers on the Omote-Ginza route, offering food and drinks. In 2000, Enzanso took over the management of Arimineso and Daitenso, further consolidating its group operations. Kassengoya continues to operate seasonally, typically from late April to late November, with daily service during the summer peak and weekend-only service in the shoulder seasons. Its signature items, watermelon and udon, have made it a well-known stop on the route, and it has been featured in regional media, including a 2026 article by JA Nagano Chūōkai's web magazine.

• 2026

  Kassengoya's watermelon is featured in JA Nagano Chūōkai's web magazine.

• 2000

  Enzanso takes over the management of Arimineso and Daitenso, expanding the group.

• 1964

  A cargo cableway is installed from Nakabusa to Kassengoya.

• 1934

  Enzanso becomes a incorporated company (株式会社燕山荘).

• 1928

  The hut is renamed Enzanso.

• 1921

  Chihiro Akanuma builds 'Tsubame no Koya' on Mt. Tsubakuro, the origin of Enzanso Co., Ltd.

A seasonal mountain rest hut and shop on the Omote-Ginza route, known for its watermelon and udon, serving hikers as a rest and refreshment point below Enzanso.

• Watermelon

  Signature item, sold from late June to mid-September; from early July, Matsumoto-Hata-grown watermelons are used.

• Udon noodles

  Sold from mid-June to November 3; varieties include sansai mushroom udon, kakiage udon, curry udon, shrimp tempura udon, meat udon, cold Nozawana udon, and cold plum mekabu udon.

• Tonjiru (pork miso soup)

  Sold from 7:00 to 15:00.

• Oden

  Sold from 7:00 to 15:00.

• Oshiruko

  Sold from 7:00 to 15:00, except during watermelon sales period.

• Cup ramen

  Available as part of the lunch menu.

• Drinks

  Coffee, hot milk, canned beer, water, juice, etc.

• Original goods

  Tenugui towels with original watermelon and bear designs, badges, in Jelly, sports yokan, Amino Vital, etc.

• Tent site

  Space for 3 tents, ¥2,000 per person (tax included).

1. 1合戦小屋｜北アルプス表銀座 燕岳（つばくろだけ）の山小屋enzanso.co.jp
2. 2会社案内enzanso.co.jp
3. 3合戦小屋 - Wikipediaja.wikipedia.org
4. 4Kassengoya - Wikidatawikidata.org