CastleMountain castle (yamajiro)Next 100 Fine Castles No. 133
What makes this castle distinctive
The mountain castle where Uesugi Kagetora, loser of the fight to succeed Uesugi Kenshin, met his end, and where burned rice and a charred rice ball have turned up in the soil.
Why?
In 1579, during the succession war known as the Otate Rebellion, the cornered Kagetora fled to this castle, and it fell in flames. It was abandoned afterward and never reused, so things burned that day stayed in the ground just as they were. Burned rice has been known here since the Edo period, and excavations in the third bailey even found a rice ball turned to charcoal.[1][2]
Three things not to miss
01
The view from the summit bailey
Where
The so-called honmaru, the highest bailey of the castle at about 185 m above sea level.
What to look at
The Sea of Japan and the Takada Plain to the north, the mountains on the Niigata–Nagano border to the south, and the direction of Kasugayama Castle, the Uesugi family's headquarters.
Why it's interesting
Myoko City explains that because Kasugayama Castle is clearly visible from here, the spot shows how Samegao guarded the entrance to the Takada Plain. The name honmaru (main bailey) is not original; it has been used since the Edo period simply because this is the spot with the best view.[1][4]
Can you see it?
Visible from outsideReached on foot by the castle trails. The rest hut on the summit is out of use for now because it is visibly leaning; the city asks visitors to keep away from it.
02
The rice storehouse bailey and the third bailey
Where
The so-called rice storehouse bailey and third bailey near the summit.
What to look at
The flattened baileys (kuruwa), and the earthen bank (dorui) raised directly in front of the third bailey's entrance.
Why it's interesting
The storehouse bailey has been famous since the Edo period as a place to pick up burned rice; in 1841 a samurai of the Takada domain came hiking with two friends and took some home. Excavation of the third bailey found a rice ball turned to charcoal. The bank in front of its entrance is thought to have sheltered gunners firing at enemies who broke in. The site is now a National Historic Site, and collecting burned rice is forbidden.[1][9]
Can you see it?
Visible from outsideThe earthworks can be seen. Some finds are reportedly displayed at the management center below the castle, but current displays are not confirmed.
03
The zigzag south trail and the gate bailey
Where
The south trail, which climbs the southern ridge thought to have been the castle's main approach.
What to look at
The traces of the original path zigzagging up the ridge, and the square court (masugata) at the entrance to the castle's core with an earthen bank facing it.
Why it's interesting
The path bends back and forth on purpose so attackers could not climb straight up. At the gate bailey, you enter through an opening where a gate likely stood into a square court, and the path makes a sharp U-turn in front of an earthen bank. It is a place to feel a mountain castle's defenses with your own legs.[1]
Can you see it?
Visible from outsideToday's trail runs beside the original path. It is a steep ridge walk.
At a glance for visitors
Nearest station
32 min walk from Kita-Arai Station
Climb
Steep climb
Time neededEditors' estimate
Allow 1 to 1.5 hours for a round trip from the visitor center to the summit.
Admission
Free (rest area, shop and toilets)
Hours
April–September 9:00–17:00; October 9:00–16:00; November 9:00–15:00
Access
Open to visitors
The castle site is explored on woodland trails (free). Collecting burned rice or other finds is forbidden. The summit rest hut is closed for now because it is leaning. Since April 2026 the Next 100 Castles stamp has been kept at the Hida History Park visitor center, which is open from early April to late November; where the stamp is kept in winter is not confirmed.
Samegao Castle sits on low hills in southern Niigata Prefecture, near the old border with Shinano (today's Nagano Prefecture). From the top you can see the Sea of Japan to the north, the border mountains to the south, and Kasugayama Castle, the Uesugi family's headquarters. It was one of the Uesugi side's strongholds against Takeda Shingen, who had pushed into northern Shinano through the Kawanakajima battles.[1][2]
02
Scholarly interpretation
Builder and date unknown
No record gives the year it was built. The leading theory places it around 1532–1572, when the Takeda army threatened the border and Kasugayama and other castles were being expanded; excavations have turned up many pottery fragments from the late 16th century. The castle was held by Horie Munechika, believed to have been one of Uesugi Kenshin's direct retainers.[1]
03
Historical record
The Otate Rebellion and Kagetora's end
When Uesugi Kenshin died in 1578, his two adopted sons, Uesugi Kagekatsu and Uesugi Kagetora, fought over who would succeed him in what is called the Otate Rebellion. In 1579 the defeated Kagetora shut himself up in Samegao Castle with only a few men. The castle's commander, Horie Munechika, was on Kagetora's side but was being pressed by Kagekatsu to switch sides. Kagetora took his own life here, and the war was decided in Kagekatsu's favor. These events are recorded in letters Kagekatsu wrote in the third month of 1579.[1][2]
04
Historical record
Burned, and left just as it was
Excavations found fire-damaged artifacts at every spot investigated, confirming the castle burned in battle and was then abandoned. There are no signs it was cleaned up and reused, so it is thought to preserve its 1579 appearance closely. Later development barely touched it, and six large baileys, six long trenches cut across the ridges (horikiri), and more than 100 artificial steep slopes (kirigishi) survive in good condition.[1][2]
05
Historical record
From a high-school survey to a National Historic Site
Locals long called it simply Joyama, "castle hill," but in 1963 a layout map drawn by the local history club of Arai High School was published, and the castle became widely known. It was designated a Niigata Prefecture Historic Site in 1964, and the main baileys were excavated in fiscal 2003–2006. It became a National Historic Site in 2008 and was named one of the Next 100 Fine Castles of Japan in 2017. Today it is part of the Hida History Park together with the Yayoi-period Hida site and other remains.[1][2][3]
Designated a National Historic Site (July 28)[1][2]
Named one of the Next 100 Fine Castles of Japan[3][6]
Buildings and remains
The keep today
No keep was built
A Sengoku-period earthwork mountain castle with no keep (the Japan Castle Foundation list shows none).
The site today
No buildings remain, but earthworks such as baileys, ridge trenches, cut slopes and banks cover the whole hill. The foot of the hill is laid out as the Hida History Park, with a visitor center and parking.
Main buildings
Site only
Building remains in the so-called second bailey
Excavation found post holes of a building about 8.6 m by 5.1 m, probably a work shed or storehouse. Throwing stones and burned ceramics were found around it.[1]
Key facts
Type
Castle
Setting
Mountain castle (yamajiro)built on a mountain; expect a climbEditorial article
Period
Medieval (c.1185–1570s)Editorial article
Keep (tenshu)
No keep was builtthe castle never had a keepEditorial article
National Historic Site (Samegao Castle ruins) (2008)Editorial article
Selection
Next 100 Fine Castles No. 133Japan Castle Foundation
Visiting
Access
Open to visitors
The castle site is explored on woodland trails (free). Collecting burned rice or other finds is forbidden. The summit rest hut is closed for now because it is leaning. Since April 2026 the Next 100 Castles stamp has been kept at the Hida History Park visitor center, which is open from early April to late November; where the stamp is kept in winter is not confirmed.
Address
Miyauchi, Kagomachi and Yukimori, Myoko, Niigata Prefecture[1]
Checked: 2026-10-03
Nearest stations and how to get there
Kita-Arai StationEchigo TOKImeki Railway Myoko Haneuma Line
about 32 min walk · Steep climb
About 32 minutes' walk from the station to the Hida History Park visitor center. From there, a mountain trail climbs to the summit bailey.[3][5]
Checked: 2026-10-03
Hours and admission
Hida History Park visitor center
Hours
April–September 9:00–17:00; October 9:00–16:00; November 9:00–15:00
About 10 minutes by car from Arai Smart IC on the Joshin-etsu Expressway. Free parking for 30 cars at the visitor center (per the prefecture's 2022 information).[3][5][7]
Checked: 2026-10-03
Grounds opening hours
Not confirmedChecked: 2026-10-03
Time neededEditors' estimate
Allow 1 to 1.5 hours for a round trip from the visitor center to the summit.
Steps, slopes and footing
There are three trails: the north trail with log-style steps, the steep south ridge trail, and the long, gentle east trail along the side of the ridge. All are mountain paths.[1]
Wheelchairs and strollers
Not confirmed (the castle site is reached by mountain trails)Checked: 2026-10-03
Toilets and rest
At the Hida History Park visitor center (when open)[4]
English signs / audio guide
Not confirmed
Seasons
Dogtooth violets carpet the park in April (including rare white ones), sasayuri lilies bloom in June, and the leaves turn in November. This is snow country, and the visitor center closes in winter.[4][5][7]
Photography
Not confirmed
Works, closures and restrictions
Broken branches and fallen trees have been reported throughout the park, and the city asks visitors to stay out of the woods on windy days. The summit rest hut is closed because it is leaning. Carry a bear bell or radio. For trail conditions, call the visitor center (0255-72-0697).[4]Checked: 2026-10-03
Suggested routes
Niigata Health Walking Road: Hida History Park (Samegao Castle) course 55 min
Start at the Hida History Park visitor center
See the shallow hollows left by Yayoi-period pit dwellings
Follow the woodland trail to Samegao Castle
Take in the Kubiki Plain and the Sea of Japan from the summit bailey
Return to the visitor center
A loop registered by Niigata Prefecture (3.2 km, about 55 minutes). The prefecture recommends the round trip to the summit of Samegao Castle.
A National Historic Site inside the Hida History Park, where pit dwellings from the Yayoi period, about 1,800 years ago, can still be seen as shallow hollows.[4][8]
Kofun-period burial mounds inside the Hida History Park, including a keyhole-shaped tomb.[4]
Checked: 2026-10-03
Editors' guide
An editorial guide based on sources and confirmed information — not a first-hand visit report.
Who will enjoy it
Good for those who enjoy hiking Sengoku-period earthwork castles, anyone curious where the Uesugi succession war ended, and travelers touring Uesugi castles together with Kasugayama.
What makes it interesting
There are no stone walls or buildings; the earthworks are the show. Climb the zigzag south trail, through the square court of the gate bailey and past deep ridge trenches and steep cut slopes, and you see how the whole hill was made into a defense. At the top, look for the direction of Kasugayama Castle.
Before you go
The site is reached on mountain trails with a real climb to the top. Warnings about bears and fallen trees are in effect, so carry something that makes noise and avoid windy days. The visitor center, where the stamp is kept, closes in winter, so April to November is the easiest time to go.
Ways to enjoy it
Knowing about the burned rice and charred rice ball makes the castle's last day in 1579 feel close. At the foot of the hill, Shofukuji Temple has a statue of Uesugi Kagetora. Visiting in dogtooth-violet season in spring or sasayuri season in early summer, combined with the Yayoi site and burial mounds, makes a fine day out.
Photos
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Open questions
There is no record of when or by whom the castle was built; the 1532–1572 dating is the leading theory only.
Edo-period histories say the castle was set on fire, and excavated finds confirm it burned, but accounts differ on who set the fire.
Figures for the site's size differ: Myoko City gives about 100,000 m² of built earthworks and about 220,000 m² including natural terrain, the Agency for Cultural Affairs gives about 250,000 m², and the designated area is 224,128 m².
We could not confirm where finds are displayed, where the stamp is kept in winter, park hours, English signage or photo rules. The parking figure (30 cars) is from the prefecture's 2022 information.
