January
Baltimore Orioles begin the new year in the tropics, mostly in social flocks that look like bright tropical ornaments in good feeding trees.
February
Baltimore Orioles are on their wintering grounds in Florida, Central America, and the northern part of South America, with a handful usually in coastal California. Occasionally, a straggler or two survives the winter in the central or even northern states. Some are starting to migrate through Panama throughout the month.
March
Some migrating Baltimore Orioles are reaching Mexico, while many are still found south to Panama.
April
The peak of oriole migration occurs from mid-April through mid-May. The first Baltimore Orioles are reaching Texas, and by the month's end, a few are reaching the central states.
May
Baltimore Orioles reach the northern states and provinces. May is the peak month for nest-building.
June
This is the month most baby Baltimore orioles hatch. Parents are busy incubating eggs and raising babies.
July
As Baltimore Oriole babies become independent, parents begin molting their body and flight feathers, and some are already starting to migrate at the beginning of the month.
August
Migration for Baltimore Orioles peaks in August and September. Birds are steadily molting their body and flight feathers.
September
Migration for Baltimore Orioles continues. Birds are still molting their body and flight feathers.
October
Migration for Baltimore Orioles in North America ebbs during the first half of the month, and most birds reach their tropical wintering grounds. Birds are done molting their body and flight feathers.
November
Baltimore Orioles are mostly in the tropics, though a few individuals linger, even in the northern states and provinces.
December
Just about all Baltimore orioles are in the tropics, but one or two stragglers might be seen on Christmas Bird Counts.