This is a species of dense vegetation. The buff-throated saltator feeds on fruit (e.g. of Cymbopetalum mayanum (Annonaceae), Trophis racemosa (Moraceae), and gumbo-limbo (Bursera simaruba)), buds, nectar and slow-moving insects. It forages at low and mid levels, sometimes with mixed species flocks.
The two pale blue eggs per clutch measure some 22–32 mm (0.87–1.26 in) long by about 16.5–21.5 mm (0.65–0.85 in) wide and weigh about 4.8–6.1 g (0.17–0.22 oz) each, which is large among Saltator eggs. They are laid in a bulky cup nest up to 2 m (6.6 ft) high in a tree or bush.