White-tailed Nighthar is not globally threatened. This species has a very large geographic distribution, and the population is presumed to be stable (BirdLife International 2014). Consequently its IUCN Red List status is evaluated as of Least Concern (BirdLife International 2014). The population on Martinique, however, which represents an endemic subspecies, is threatened by habitat destruction and introduced predators (Raffaele et al. 1998).
Generally the relative abundance of White-tailed Nighjar is assessed as uncommon and somewhat local (Panama: Ridgely and Gwynne 1989) to fairly common (Colombia: Hilty and Brown 1986; Trinidad and Tobago: ffrench 1991) or locally common (Venezuela: Hilty 2003).