Kumakogen Town: Clear Air and Starry Skies of the Highlands Spreading on the Roof of Shikoku

Kumakogen Town in Kamiukena District, Ehime Prefecture, is a highland town spreading at the southern foot of the Ishizuchi mountain range. Called the roof of Shikoku, its appeal is a refreshing climate that stays cool even in summer, and it is wrapped in air so clear you would hardly believe it is only about an hour by car from central Matsuyama. Seeking rich nature, a sky full of stars, and highland flavors, many people visit throughout the seasons, making it a popular spot.

Highlights: Clear Highlands on the Roof of Shikoku

Kumakogen lies deep in the Shikoku Mountains, a quiet highland area surrounded by peaks. Because the elevation is high and the air is clear, the sky feels surprisingly close; by day there are green mountain ranges and refreshing breezes, and by night a dark sky undisturbed by city lights. Even in summer the temperature is a few degrees lower than the lowlands, so many visit as a summer retreat, and activities to enjoy nature such as trekking, camping, and cycling are plentiful.

Kumakogen Astronomical Observatory and the Starry Sky

One of Kumakogen's great charms is its breathtakingly beautiful starry sky. On the highlands with little light pollution, the Milky Way and countless stars can be seen clearly even with the naked eye, offering a night sky like scattered jewels. The town has the Kumakogen Astronomical Observatory equipped with a full-scale telescope, where you can observe planets and nebulae while listening to explanations from specialist staff. Viewing sessions are sometimes held, making for an unforgettable night for families and astronomy fans.

The Ohenro Pilgrimage and Shikoku Karst

Kumakogen Town has Daiho-ji Temple (No. 44) and Iwaya-ji Temple (No. 45) of the Shikoku 88 Sacred Sites, and is known as a place of pilgrimage. Iwaya-ji Temple in particular draws worshippers with its distinctive scenery of halls built nestled against a giant rock wall. Kumakogen is also a southern gateway to the Shikoku Karst, formed by vast grasslands and limestone, and trips extending there together are popular.

Seasonal Enjoyment and Access

The best season runs from the vivid greenery of early summer through the even clearer air of autumn. Autumn brings beautiful mountains dyed in foliage, and winter offers snowy scenery. For access, it is convenient to take a bus toward Kumakogen from the JR Matsuyama Station area, or drive south on National Route 33. In winter there is road freezing and snow, so if driving, do not forget preparations such as appropriate tires. Bus frequency is limited, so checking the timetable in advance is reassuring.

Practical Travel Notes

• Highland nights are cold even in summer. Always bring a layer for stargazing.
• Observatory viewing sessions and facility operation vary with the weather and season. Confirming the opening status before visiting is reassuring.
• Public transport is limited. If you also want to visit the nearby karst and pilgrimage temples, traveling by car is realistic.
• Beware of snow and ice in winter. If you are not confident driving, choosing a season with little snow is recommended.

One Piece of Advice

Kumakogen is a place where you can savor two faces at once: refreshing nature by day and a star-filled sky by night. If you are going to visit, staying overnight rather than a day trip and enjoying the stars after dark is recommended. Combining it with the Shikoku Karst and pilgrimage temples makes for a trip that lets you feel the charm of the roof of Shikoku more deeply.

📚 Sources

The information here is based mainly on the public guidance from Kumakogen town and its tourism association. The information for the Kumakogen Astronomical Observatory, access to Daihoji and Iwayaji temples and the Shikoku Karst, and on-site information boards are also useful references. Because observatory star-viewing sessions and hours, winter road conditions, and bus service may change, please confirm the latest details with each facility or Kumakogen town before you visit.

Visitor Checklist

• Estimated time needed: About half a day for the observatory and nearby sights; if you also enjoy stargazing, staying overnight and allowing a full day or more is recommended.
• What to bring: Always bring a layer, as highland nights are cool even in summer. Prepare warm clothing for stargazing, and if driving in winter, do not forget snow tires and other winter measures.
• Suggested route: By day, enjoy the highland nature, the pilgrimage temples Daihoji and Iwayaji, and a trip to the Shikoku Karst; by night, enjoy the stars at the Kumakogen Astronomical Observatory. An overnight stay is more relaxed than a day trip.

Practical Information for Your Visit

• Opening days of the Kumakogen Astronomical Observatory: Tuesday to Sunday and public holidays. It is closed on Mondays and on the day after a public holiday (excluding Saturdays and Sundays). Since April 1, 2025 (Reiwa 7) the same schedule has applied in both the regular season (April 1 to November 30) and the winter season (December 1 to March 31).
• Opening hours: 10:00-17:00.
• Planetarium screenings: Three times a day at 11:00, 13:30 and 15:00, each lasting about 30 minutes. Capacity is 20 people, and tickets go on sale one hour before each screening.
• Observatory stargazing sessions: Reservations by telephone only (accepted from three months in advance, between 10:00 and 17:00). From April 1 to September 30 they are held on Fridays and Saturdays at 20:00 and 21:00, from October 1 to November 30 on Fridays and Saturdays at 19:30 and 20:30, and from December 1 to March 31 on Saturdays at 19:00.
• Admission: For both the planetarium and the observatory, 500 yen for adults, 400 yen for high school and university students, and 300 yen for preschool children and elementary and junior high school pupils. Showing a disability certificate or similar halves the price.
• In rainy or cloudy weather: Stargazing sessions are cancelled, so you need to call between 16:30 and 17:30 on the day to check.
• Equipment: The observatory is equipped with a reflecting telescope with a 60 cm aperture.
• Address and contact: 488 Otsu, Shimohatanogawa, Kumakogen Town, 791-1212 (inside Kumakogen Furusato Ryokomura), telephone 0892-41-0110.
• Parking: In addition to the car park in front of the observatory (which can take microbuses), there is a second car park a 5-minute walk away.
• Access: About 30 minutes by car from the Matsuyama IC. About 1 hour by bus on the Kumakogen line from JR Matsuyama Station, getting off at Kumakogen.

(Source: Kumakogen Town official website)