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

Showcasing the spectacle of bird migration

When, where, and how far will birds migrate? How many birds passed last night? Our tools help you explore the answers to these and many other questions about bird migration.

Learn how


Migration tools


Explore nightly migration data in your region.  Learn more

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 Andrew Farnsworth The Cornell Lab Apr 19, 2022

The new BirdCast Migration Dashboard is here, providing nocturnal bird migration data for counties and states in the contiguous US! This tool offers new capabilities to investigate birds' movements in detail and at scales that complement our existing national forecast and live migration maps. Try it out today to explore patterns of nocturnal bird migration in your area!  Read more

By Andrew Farnsworth The Cornell Lab Oct 15, 2021

This weekend's change in temperature will harken the first big flocks of Brant, and numerous other species, arriving in the northeastern US.  Read more

By Andrew Farnsworth The Cornell Lab Sep 16, 2021

BirdCast is deeply disturbed by the mass bird collision events that occurred earlier this week in Manhattan. Light pollution and poor flying conditions on a night of intense migration contributed to these events. There are essentials actions we can take to prevent these types of events: turning off all non-essential lights, especially during migration periods, to reduce birds' attraction to and disorientation by them, and making buildings bird friendly. See our recommendations for turning off lights below.  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