Hawk Mountain and Fall Raptor Migration in Pennsylvania
Pennsylvania's Hawk Mountain is the world's first refuge for birds of prey. Learn when to visit, which raptors stream past, and how to read a hawk-watch.
Every autumn, thousands of hawks, eagles, and falcons stream south along the Appalachian ridges — and Pennsylvania's Hawk Mountain Sanctuary, the world's first refuge for birds of prey, is the place to witness it.
Why the ridges concentrate raptors
Migrating raptors save energy by riding updrafts deflected off mountain ridges and thermals rising over the land. The long Appalachian ridgelines act as highways, funneling birds past fixed lookouts where observers can count them by the thousands.
What flies past, and when
- Mid-September: the famous Broad-winged Hawk push — 'kettles' of hundreds or thousands swirling in thermals.
- Late September–October: Sharp-shinned and Cooper's Hawks, Ospreys, American Kestrels, and Bald Eagles.
- Late October–November: Red-tailed Hawks, Golden Eagles, and Northern Goshawks on cold north winds.
How to read a hawk-watch
Hawk-watching is its own skill — most birds are distant specks identified by shape and flight style. Sit with the regular counters, who'll teach you to separate accipiters, buteos, and falcons at a glance. Bring layers, sunscreen, and patience; the best flights follow cold fronts with northwest winds.
Beyond Hawk Mountain
Pennsylvania has other great watches, and the state also offers Middle Creek (tens of thousands of Snow Geese and Tundra Swans in late winter) and Presque Isle on Lake Erie (warblers and waterbirds). The Keystone State rewards every season.
Plan your hawk-watch
Aim for a clear day after a cold front in late September or October. Practice raptor ID beforehand, and use Birder AI to confirm the closer birds and log a day count that captures the scale of the spectacle.
Frequently asked questions
When is the best time to visit Hawk Mountain for raptor migration?+
Mid-September brings the spectacular Broad-winged Hawk flights, late September through October features accipiters, falcons, ospreys, and eagles, and late October into November brings Red-tailed Hawks and Golden Eagles. The best days follow cold fronts with northwest winds.
Why do hawks migrate along mountain ridges?+
Migrating raptors conserve energy by riding updrafts deflected off ridges and thermals rising over the land. Long ridgelines like the Appalachians act as highways that funnel birds past fixed lookouts, where they can be counted in the thousands.