MYSTERY OF THE MISSING MIGRANTS | © Charley Harper Art Studio | Used with Permission

Bird migration forecasts in real-time

When, where, and how far will birds migrate? Our migration forecasts will answer these questions for the first time.

Learn how


Migration tools


Bird migration forecast maps show predicted nocturnal migration 3 hours after local sunset and are updated every 6 hours. Colorado State University and the Cornell Lab of Ornithology currently produce these forecasts.  Learn more

Forecast map: Day 1
Forecast map: Day 2
Forecast map: Day 3
Forecast map: Day 1
Forecast map: Day 2
Forecast map: Day 3

Search with our local migration alert tool to determine whether birds are passing overhead near your city tonight!  Learn more

See real-time analysis maps of intensities of actual nocturnal bird migration, as detected by the US weather surveillance radar network between local sunset to sunrise. Cornell Lab of Ornithology currently produces these maps.

Play live bird migration maps

Recent news

Forecast and Analysis
By Adriaan Dokter and Benjamin Van Doren The Cornell Lab Apr 13, 2021

The BirdCast team has unveiled a new feature on our maps! Forecast and live migration maps now indicate the total number of birds in flight above the contiguous United States.  Read more

Forecast and Analysis
By Andrew Farnsworth The Cornell Lab Apr 09, 2021

On Saturday 10 April, a frontal boundary is forecast to move into the Gulf of Mexico region. Beginning midday Saturday, birds may begin concentrating in coastal habitats, particularly in the Upper Texas and southwestern Louisiana coasts; but events may be quite complex, because forecasts suggest that the front will stall.  Read more

By Andrew Farnsworth The Cornell Lab Apr 09, 2021

Easterly winds are blowing in the North Atlantic, and they may bring some surprise visitors to northeastern North America.  Read more

All news

NASA Earth Observatory images by Joshua Stevens, using Suomi NPP VIIRS data from Miguel Román, NASA's Goddard Space Flight Center

Lights Out

Every spring and fall, billions of birds migrate through the US, mostly under the cover of darkness. This mass movement of birds must contend with a dramatically increasing but still largely unrecognized threat: light pollution.

BirdCast Partners and Support

BirdCast is a consortium of interdisciplinary researchers, primarily from three organizations at present, with a growing list of collaborators, supporters, and partners. Learn more

Core partners
Core funders
Other support
Lights Out partners