[1] Kaga bordered on Echizen, Etchū, Hida, and Noto Provinces.

In 701 AD, per the reforms of the Taihō Code, Koshi was divided into three separate provinces: Echizen, Etchū, and Echigo.

Despite this classification, Kaga never developed a powerful local gōzoku clan but was divided into many shōen estates.

The area was eventually conquered by Oda Nobunaga's general Shibata Katsuie and subsequently came under the control of Maeda Toshiie under the rule of Toyotomi Hideyoshi.

The Maeda clan retained control of the province as part of Kaga Domain during the Edo period Tokugawa shogunate.