August Migration
This article was originally published in the San Joaquin Audubon Society’s The Hoot Owl newsletter, August 1, 2025 edition.
We’re nearing the end of another sizzling summer in the Central Valley. Many of us have been dragging through the summer doldrums – a period of dampened bird activity – while daydreaming about the upcoming migration that promises to inject excitement back into our birding lives. Peak fall migration in the lower 48 states is generally September through October, but did you know that August is when shorebirds are on the move?
These next several weeks are the perfect time to be scanning water sources to welcome back familiar friends from their breeding adventures. Shorebird rarities or short-term visitors will be popping up throughout the county. Look out for phalaropes spinning around in dizzying circles as they swirl up their food in the resulting vortex. Grab your scope and scan the groups of peeps (small sandpipers) to see if a Baird’s or Semipalmated Sandpiper can be plucked out of a flock. Take an extra moment to review Spotted Sandpipers in case the similar Solitary Sandpiper is actually the one bobbing along the water’s edge looking for food.
A useful tool to help predict upcoming bird migrants is eBird’s bar chart feature. Available for hotspots, counties, and even your own personal location, bar charts collect eBird data and display bird frequencies for your selected location. Use this link for the San Joaquin County bar charts (keep in mind that rarities are captured in the bar charts and do not necessarily represent expected species for the area). You can also review a nocturnal migration dashboard on BirdCast, which provides live and historical data during the spring and fall migration periods. Check out these resources, brush up on your shorebird ID, and brave the last heat of the summer as the final migration of 2025 gets underway!