Climate change affects important biological processes, bird migration phenology being
a particular well-documented one. While spring migration have been found to advance
by numerous studies, autumn migration is less studied and show more variable change in
timing. Few studies of autumn migration are based on data from after 2000, leaving the
last two decades to be relatively less studied. Here, we investigate recent change in autumn
migration phenology of European passerines. The most recent available bird ringing data
from Denmark is used to analyse phenological change of median and late migration of 14
passerine migrants between 2003–2021. We find an overall delay of autumn migration,
mainly driven by short-distance migrants. All short-distance migrants, one out of five
medium-distance and three out of five long-distance migrants delay autumn migration.
None of the included species advance autumn migration significantly. As climate change
has continuously resulted in milder conditions in north-western Europe, we expect this to
cause further effects on migration phenology also in recent decades. Our results provide
novel insight into recent migration phenology trends, and the observed delay in long-
distance migrants may illustrate a changed response to climate change.