There is little information on the breeding biology of Scissor-tailed Nightjar. Specimens in breeding condition are reported from southern Brazil from September through November, and nests with eggs are reported from the same region in late November and late December (Belton 1984). Nests with eggs are reported from Argentina from early October to early December (de la Peña 1987). There is no nest; the eggs are placed directly on the ground. One nest was sited on nearly bare granitic rock in scrub on a rocky hillside; a second nest was on the ground in a grove of a non-native Acacia (Belton 1984). The clutch is two; the eggs are light brown, creamy white, or pinkish buff, scrawled or spotted with darker brown and gray (Belton 1984, de la Peña 1987, Cleere 1998). Egg dimensions are 24.6-30.8 x 17.9-22.6 mm (Cleere 1998). Nothing further is known about the nesting biology of this species.