The Green-crowned Brilliant's current IUCN status at the global level is Least Concern, as it does not approach the thresholds for Vulnerable under any of the IUCN criteria (BirdLife International 2011). It is not listed as threatened at the national level in any of its range countries. As is true of all hummingbirds (regardless of rarity), it is included in Appendix II of CITES.
Effects of human activity on populations
Some parts of the species' range, such as the Costa Rican highlands, are relatively well protected, and it has been recorded in many protected areas (Stiles 1999). Like many hummingbirds, the Green-crowned Brilliant shows some tolerance of habitat fragmentation, degradation and disturbance (e.g. Borgella et al. 2001, J. Taylor pers. obs.); however, outright forest clearance is expected to cause local population declines, and such declines are suspected to be taking place (BirdLife International 2011). In most parts of its range in Colombia, it has probably suffered moderate to severe habitat loss due to deforestation (Stiles 1999). The predominant drivers of forest clearance throughout the species' range are likely to be agricultural expansion and timber extraction.