After a reconnaissance in 1939 and a few serious attempts starting in 1967, the first ascent of Hardeol was made by a team from the Indo-Tibetan Border Police on 31 May 1978, led by S. P. Mulasi, climbing from the ridge connecting the peak to Trishuli. Only one further ascent, in 1991, is listed in the Himalayan Index. This ascent, by a large expedition from the Indian Border Security Force, put five members on the summit on 24 September.