The Pacific Flyway Comes to Carlsbad
The Pacific Flyway is one of four major North American bird migration corridors, running from Alaska and Canada down the Pacific coast to Central and South America. Carlsbad sits directly on it.
Every fall, millions of birds move south through this corridor — and the three Carlsbad lagoons are exactly the kind of stopover habitat that tired migrants need. Tidal mudflats for shorebirds. Freshwater marsh for waterfowl. Coastal sage scrub for warblers and flycatchers.
What to Expect Month by Month
August — Early Shorebirds
Adult shorebirds begin moving south in July; by August the numbers build. Western Sandpipers and Dunlin arrive first. Least Sandpipers, Semipalmated Plovers, and Black-bellied Plovers follow. Low tides at Batiquitos and Agua Hedionda are the place to be.
September–October — Peak Diversity
The best weeks of the year. Passerine migration adds warblers, flycatchers, and vireos to the shorebird mix. Rarities show up. The Buena Vista Lagoon monthly count (4th Saturday in October) often turns up the year’s best surprises.
November — Waterfowl Arrive
Migration transitions to winter residency. Buffleheads, Canvasbacks, and scaup fill the lagoons. Peregrine Falcons become regular over the marshes.
Where to Watch
Batiquitos Lagoon — North shore trail at low tide. Best for shorebird concentrations on exposed mudflats.
Buena Vista Lagoon — Walk the Carlsbad Boulevard shoulder for scan points across the lagoon. Monthly Audubon counts held here.
Agua Hedionda — Discovery Center area for tidal marsh species. Freshwater sections hold different species than the tidal lagoons.