The adult male has bronzy green upperparts and the tail feathers are black with rufous edges.

Their central tail feathers are green; the rest have rufous bases, a black band near the end, and deep buffy tips.

Immature birds resemble adult females but have rusty fringes on their head and nape feathers and more green on the tail.

[5] As of July 2022 neither the Cornell Lab of Ornithology's Macaulay Library nor xeno-canto have any recordings of the glow-throated hummingbird's vocalizations.

It also lives near the top of the rather low mountains and so is expected to undergo further range contraction as the climate continues to warm.