Bombus hyperboreus have a varied diet and mostly forage on medium to deep flowers. Some species that have been observed pollinating are of the genus Pedicularis, specifically Pedicularis hirsuta and Pedicularis lapponica. But they are not limited to just those species. Near Lake Latnjajaure of northern Sweden, Bombus hyperboreus have been observed collecting pollen and nectar of Saxifraga oppositifolia and then switching to forage on Astragalus alpinus and Bartsia alpina once those come into flower. The flowers they forage on also vary depending on the season and altitude of their habitation. In Mt. Njulla of northern Sweden, for example, in the beginning of the summer, Rhododendron lapponicum and Salix species dominate their diet, but as the season goes on, their diet changes to consumption of Vaccinium species mid-summer and, finally, to consumption of Astragalus alpinus and Solidago virgaurea towards the beginning of August.
