Few nests of Stripe-tailed Hummingbird are reported. In Mexico, breeding extends from April (Rowley 1984, Binford 1989) to August (Howell and Webb 1995); in Costa Rica, breeding is from September/October to March/April (Stiles and Skutch 1989).
The nest is a cup composed of plant down, lined on the outside with lichens, especially red lichens (Rowley 1984, Stiles and Skutch 1989), and sited 1-3 m above the ground, often near streams (Rowley 1984, Stiles and Skutch 1989). The measurements of one nest were: external diameter 46.5 mm, outer depth 38.3 mm, diameter of cup 25.1 mm, depth of cup 29.3 mm (Rowley 1984).
The clutch is two; the eggs are white and unmarked, although sometimes the eggs take on a pink stain from the red lichens in the nest (Rowley 1984). Mean egg dimensions (n = 5, from 3 clutches) are 12.9 mm x 8.6 mm (range 12.2-13.5 mm x 8.1-9.2 mm) (Rowley 1984).