Saku (佐久市) Travel Guide & City Profile

Last reviewed: October 23, 2026 · Prices are approximate and for orientation only.

Overview & City Profile

Saku (佐久市, Saku-shi) is a city located in Nagano Prefecture, Japan. As of 1 July 2023, the city had an estimated population of 97,454 in 41,522 households, and a population density of 230 persons per km². The total area of the city is 423.51 square kilometres (163.52 sq mi).

Within Nagano Prefecture (Chubu region), Saku (佐久市) serves as a city in nagano prefecture. Travelers exploring Nagano often combine a stop in Saku with regional highlights such as Original black-walled Matsumoto Castle, Zenko-ji Temple in Nagano, Jigokudani Snow Monkey Park, Nakasendo post towns (Narai-juku, Tsumago, Magome), Kamikochi, and Hakuba/Nozawa Onsen.

Getting to Saku & Getting Around

Via the regional hub (Nagano Station (Hokuriku Shinkansen) & Matsumoto Station (JR Azusa)): 1h 22m from Tokyo Station to Nagano on the Hokuriku Shinkansen (65m to Karuizawa), or 2h 35m from Shinjuku to Matsumoto on the JR Limited Express Azusa.

• Local rail & IC cards: Once in Nagano Prefecture, JR regional lines and local private railways connect Nagano with Saku. Nationwide IC cards (Suica, Pasmo, Icoca) work on major urban and JR commuter gates; for rural branch lines or local buses, keep ¥1,000 bills and ¥100 coins handy for the onboard fare box.
• Luggage & station lockers: Main stations in Nagano have coin lockers for day-trippers. If you are stopping in Saku en route between larger bases, check your suitcase dimensions in our Luggage & Locker Checker or forward big bags ahead with Takkyubin.
• Driving & car rental: While city centers around Saku are accessible by train and taxi, renting a car from a major Shinkansen station or airport in Nagano can be rewarding for reaching mountain gorges, coastal viewpoints, and countryside onsen. Read our Renting a Car in Japan Guide.

What to Eat in Saku & Nagano

Saku shares the culinary traditions of Nagano Prefecture and the wider Chubu region. Don't miss these local specialties during your visit:

• Shinshu soba (buckwheat noodles) — a signature specialty across Nagano Prefecture.
• Oyaki (stuffed roasted buckwheat buns) — a signature specialty across Nagano Prefecture.
• Sanzoku-yaki (crispy garlic fried chicken) — a signature specialty across Nagano Prefecture.
• Shinshu miso & apples — a signature specialty across Nagano Prefecture.
• chestnut sweets in Obuse — a signature specialty across Nagano Prefecture.

For dietary restrictions or food allergies, open our Japanese Phrasebook & Show-to-Staff Cards to display clear Japanese dietary explanations at restaurants in Saku.

Best Time to Visit & Seasonal Highlights

April for Matsumoto & Takato Castle blossoms; July–August for Kamikochi & Karuizawa highland hiking; October for Kiso Valley foliage; Dec–Mar for Hakuba, Nozawa & snow monkeys.

Regional highlights across Nagano Prefecture that pair well with a visit to Saku include: Original black-walled Matsumoto Castle, Zenko-ji Temple in Nagano, Jigokudani Snow Monkey Park, Nakasendo post towns (Narai-juku, Tsumago, Magome), Kamikochi, and Hakuba/Nozawa Onsen.

Practical Travel Tips for Saku

• Tourist information center (観光案内所): Look for the Kankō Annaijo counter inside or right outside the main train station in Saku (or at Nagano Station (Hokuriku Shinkansen) & Matsumoto Station (JR Azusa)) for free walking maps, bus timetables, and festival calendars.
• Cash & ATMs: While hotels, chain stores, and convenience stores in Saku accept international cards and IC payment, smaller family-run restaurants, shrines, and rural buses often prefer cash. 7-Eleven (Seven Bank) and Japan Post ATMs accept foreign debit cards reliably.
• Dining hours: Outside major metropolitan hubs, lunch typically runs 11:30 AM–2:00 PM and dinner spots open around 5:30 PM, with earlier last orders (around 8:00–9:00 PM) in smaller cities.