After amassing a mammoth 463 for nine in their first innings in response to Assam's paltry 81 all out, Himachal bowled out the visiting side for 161 to record the huge win.
Assam were overnight 97 for six Dheeraj Jadhav put up a stiff resistance to post a half century. His 52-run knock came off 125 deliveries and included six hits to the fence.
His was the last Assam wicket to fall in what was otherwise a shambolic batting performance.
Brief Scores:
Himachal Pradesh: 463/9d
Assam: 81 and 161 in 53.5 overs (Dheeraj Jadhav 52, Rishi Dhawan 5/58).