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Monarch Butterfly Migration Map

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They're Here!
"As if by magic, rain and dark clouds pulled apart overnight and the first monarchs appeared..." More...

Monarch Butterfly Migration
Monarchs arrive en masse at El Rosario Sanctuary on November 2, 2016 by Homero Gomez.


Help Monarchs
Report Your Sightings and Track Migration

Report your sightings each fall and spring as the monarchs travel to and from Mexico.
Track migration on real-time migration maps. Help scientists learn more about monarchs.

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Fall Migration 2016
August - November

Watch this season's story unfold.
Monarch butterfly migration
Monarch Butterfly Caterpillar on Milkweed
Monarch Butterfly Caterpillar on Milkweed
About Fall Migration
August - November

Join us as we track the monarch's migration to Mexico.

The Migratory Generation
August 1, 2016

The magnificent migratory generation is developing now. Watch for the 1st signs of fall migration in mid-August.

Fall Migration is Underway!
August 25, 2016

Sightings of southbound monarchs, intense nectaring, and the first overnight roosts are being reported.



Monarch Butterfly Caterpillar on Milkweed
Monarch Butterfly on North Dakota Prairie
Monarch Butterflies nectaring in an Iowa prairie
Clues from Tagged Monarch
September 1, 2016

What does a tagged monarch, found in Toronto, tell us about migration?

Nectar and Migration
September 8, 2016

Building fat reserves as they move toward Mexico, where can monarchs find the nectar they need?

On the Move
September 15, 2016

People are counting monarchs roosting by the hundreds, feeding by the dozens, and flying overhead at rates up to 37 per hour.

Children releasing Monarch Butterflies Monarch Butterflies nectaring in school garden in Omaha, Nebraska Monarch Butterflies Roosting in Olney, Texas
Celebrating Citzen Science
September 22, 2016

Who's watching monarchs — and what can we learn about migration from their observations?

Traveling Two Flyways
September 29, 2016

Citizen science has revealed the monarch's migration flyways, and this year's butterflies are traveling along the predicted pathways.

Another Surge Southward
October 6, 2016

The migration's leading edge advanced by over 300 miles this week and is now 800 miles from the overwintering sites in Mexico.

Monarch Butterfly Migration Monarch Butterfly Migration Monarch Butterfly Migration
Funelling into Texas
October 13, 2016

All eyes are on the sky as peak migration moves into Texas. How high do monarchs fly — and how high can we see them.

Headwinds Slowing Migration
October 20, 2016

The migration is moving southward slowly, with persistent south winds holding the butterflies back. See what migration data predicts about the population.

¡Bienvenidas a México!
October 27, 2016

Monarchs are streaming across northern Mexico now — and the very first butterflies have reached the winter sanctuaries!

Monarch Butterfly Migration    
They're Here!
November 3, 2016

"As if by magic, rain and dark clouds pulled apart overnight and the first monarchs appeared..."


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