# North American bird migration patterns

> Live situation record from CLSTR: https://clstr.news/situations/north-american-bird-migration-patterns
> Updated: 2026-09-15T12:59:55.000Z. Sources: 7. Developments: 2.

As autumn approaches, bird species across North America are beginning seasonal migrations toward warmer climates in South and Central America. In Canada’s boreal forests, an estimated five billion birds depart annually, undergoing physiological changes such as hyperphagia to build fat reserves for their journeys.

In Wyoming, specific hummingbird species including Broad-tailed, Rufous, and Calliope hummingbirds are starting their southward movement. These birds may travel up to 1,500 miles, typically following a pattern where adult males depart first, followed by females and then the young. To assist these travelers, experts suggest maintaining clean feeders, though Wyoming officials advise removing them once migration begins to prevent attracting bears.

## Timeline

### 2026-09-15: Wyoming hummingbirds begin southward migration for winter

Hummingbirds in Wyoming are migrating south toward the southern US and Mexico. Species like the Broad-tailed and Rufous hummingbirds lead the seasonal movement to escape the winter cold.

2 sources. https://clstr.news/cluster/wyoming-hummingbirds-begin-southward-migration-for-winter

### 2026-09-05: Bird migration begins across North America as autumn approaches

North American bird species, including hummingbirds and songbirds, are preparing for fall migration by building fat reserves and traveling toward warmer climates in Central and South America.

5 sources. https://clstr.news/cluster/bird-migration-begins-across-north-america-as-autumn-approaches

---
Cite as: North American bird migration patterns. CLSTR, https://clstr.news/situations/north-american-bird-migration-patterns