SilkCode LibraryCastles of Japan
No. 032Kanto & KoshinetsuNiigata

Kasugayama Castle

春日山城

Ruins & historic sites

Known as Uesugi Kenshin’s seat, Kasugayama is an extensive earth-built mountain castle. Summit enclosures, hillside terraces and the lower perimeter together reveal the scale of the complex.

A hilltop clearing and stone markers at Kasugayama Castle
A hilltop clearing and stone markers at Kasugayama CastlePhoto: ELK（投稿者） · CC BY-SA 3.0 · Resized and converted to WebP. Cards crop the display.This photograph shows the site at the time it was taken. Check the notes and official sources for current restoration work and access.

Get to know the castle

Castle at a glance

Site & layout
Earth-built mountain castle ruins
Origins
Foundation unknown; first documented in 1513
Builders & patrons
Nagao-Uesugi and Hori families
Other names
Hachigamine Castle
What remains today
Terraces, ditches, banks and outer perimeter; reconstructed features in the lower park

THE STORY

The story behind the walls

The foundation is uncertain, but a document of 1513 shows that a mountain castle already existed. It is thought to have expanded greatly under Kenshin, Kagekatsu and then the Hori. The Hori followed the Uesugi transfer to Aizu in 1598. Construction of Fukushima Castle in 1607 marked the movement of the regional centre to the lowlands.

LAYOUT & ARCHITECTURE

Read the landscape and the buildings.

This is a castle of levelled terraces, dry moats and banks, rather than stone walls and a keep. Its layout suggests expansion from a small summit stronghold to larger southern enclosures, residences and a lower perimeter. The continuous remains illustrate changing castle-building practice.

A CLOSER LOOK

Details worth a closer look.

01

Enclosures down the mountain

Groups of enclosures continue from the summit down the slopes. Contrasts between level terraces and steep ground help explain the castle.

02

Lower defensive perimeter

Ditches and banks enclosed residences at the foot of the mountain. The castle included government and living areas as well as an upper stronghold.

03

Archaeological park

The lower historic park reconstructs excavated ditches, banks and buildings. It helps explain uses of the foothill area that are less obvious on mountain paths.

THROUGH THE YEARS

A short timeline

  1. 1513

    The castle appears in a surviving document.

  2. 1598

    The Hori followed the Uesugi transfer to Aizu.

  3. 1607

    The Hori built Fukushima Castle.

BEFORE YOU GO

A note before you go.

Check Joetsu City for trail conditions and restricted areas, including weather and wildlife notices. Confirm opening days at the lower park’s visitor museum separately.

Official visitor information ↗Find it on a map ↗

Information checked: 27 September 2026

Sources & official information

Some official sources are available in Japanese only.

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