You might count the number of sightings per day, then make a graph so you can see the peak migration dates. According to Journey North Data. The female usually arrives a few days after the male, and she's the one who builds the nest. These eye-catching, bright orange and black birds are the size of blackbirds, but they stay high in trees. If you learn the song, you will look up the moment you hear it, and might be rewarded with a glimpse of the oriole.
Orioles have a rich, full-throated whistle.
The melody and rhythm can vary greatly, but the tone stays the same. If you've already heard your resident oriole sing, it means he's establishing territory. Look for the female to arrive a few days after that. Soon after, the nest building will begin. You might see the females flying with nesting materials such as plant fibers or string.