SEASONAL MIGRATION
SPRING
March-April
Crows Return to Territories
Crows may migrate to our metro suburbs or fly hundreds of miles.
March-April: roost counts decrease and by mid-month are reduced by 75% or more: from 18,000 to 3500.
May: crows continue to depart and nightly roosts are limited to a few hundred by the end of the month.
SUMMER
May-July
Peak Regional Breeding Season
May-July: the only crows remaining in the city center appear to be local residents (i.e. downtown is their territory or non-breeding adults that come into town at night)
FALL
August-October
Crows Return to PDX
Mid-late August- crow numbers roosting downtown increase to the hundreds.
September, October-crowns continue to return to Portland at night. Numbers grow from hundreds to thousands. The pre-roost is spectacular!
WINTER
November-February
Peak Urban Roost
Nov-February- Counts observed between 6000-18,000
A Season Of Portland Crows
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