Harish was founded by Nahal in 1982 and converted into a kibbutz in 1985. In 1993 it was merged with neighouring Katzir to form a new town, Katzir-Harish. However, the three settlements were split in 2012, with Harish remaining a town, and Katzir reverting to the jurisdiction of Menashe Regional Council.
The master plan of Harish was prepared by the architecture firm Mansfeld-Kehat Architects and calls for the expansion of Harish to Highway 65 in the north, and Baqa-Jatt in the south. Initially Harish was envisioned as a Haredi city offering low-cost housing to this sector.In 2012, a secular buyers group organized to bid on lots zoned for 400 housing units there.