World Migratory Bird Day is officially celebrated on the second Saturday in May (May 9th in 2026) as migratory birds journey to nesting sites and on the second Saturday in October (October 10th in 2026) as they return to wintering areas. Because birds do not all migrate at the same time and to provide the opportunity to observe birds on stopover sites as they journey, however, we encourage you to celebrate when the timing is best at your location. WMBD programs and events are hosted nearly every month of the year.
Every day is Bird Day!
El Día Mundial de las Aves Migratorias se celebra oficialmente el segundo sábado de mayo (10 de mayo en 2025), cuando las aves migratorias se dirigen a sus sitios de anidación, y el segundo sábado de octubre (11 de octubre en 2025), cuando regresan a sus zonas de invernada. Dado que no todas las aves migran al mismo tiempo y para brindar la oportunidad de observarlas en sus lugares de escala durante su viaje, le animamos a celebrarlo cuando le sea más conveniente en su zona. Los programas y eventos del Día Mundial de las Aves Migratorias se realizan casi todos los meses del año.
¡Todos los días son el Día de las Aves!
World Migratory Bird Day is celebrated twice in one year
The day is marked on the second Saturday of May and October
, to reflect the cyclical nature of bird migration. The arrival and departure dates of migration have been consistent over the years as birds use environmental cues, including temperature, to determine when they should take flight. However, due to global warming, their annual migration rhythm is changing. Many migratory birds have to alter their routes, shorten or completely cancel their journey due to changing temperatures.
