During the breeding season, Harris's sparrows eat seeds, fruits, arthropods, and conifer needles. During winter and migrations, they limit their diet to seeds and fruit. In general, they are ground feeders and will kick at nearby vegetation with their feet until the seed or fruit falls down to ground level.
Animal Foods: insects; terrestrial non-insect arthropods
Plant Foods: seeds, grains, and nuts; fruit
Primary Diet: omnivore