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Monarch Butterfly Migration Map

They're Home!
The overwintering season in Mexico is now underway. Predictions say the population may have doubled since last year. More...

Monarch Butterflies

Felipe Martinez Espero of RBMM (Reserva Biosfera de la Mariposa Monarca)


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 2015
August - November

Watch this season's story unfold.
Monarch butterfly migration Monarch Butterfly Nectaring on Milkweed Monarch butterfly nectaring on goldenrod

About Fall Migration
August - November

Track the monarch's migration to Mexico. Weekly news updates are posted on Thursdays.

Final Generation
August 1, 2015

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

Migration Season Begins
August 20, 2015

Share your sightings and help tell the story of the monarch's migration to Mexico. The first signs of migration are expected any day.

Monarch butterfly nectaring and migrating Monarch Butterfly Nectaring on Milkweed Monarch Butterfly Migration: The Overnight Roost
Migration Building
August 27, 2015

Sightings of southbound monarchs and the first overnight roosts are clear signs that migration is underway.

Stop and Go
September 3, 2015

The stopover sites monarchs use to rest and refuel are critical for migration — and for successful overwintering in Mexico.

Southbound Butterflies
September 10, 2015

People are counting monarchs roosting by the hundreds, feeding by the dozens, and flying overhead at rates up to 2 per minute.

Monarch Butterfly Migration: The Effects of Wind Monarch Butterfly Monarch Butterfly

Peak for Great Lakes
September 17, 2015

As peak migration struck the Great Lakes this week observers saw how the wind affected our tiny travelers.

Riding a Cold Front
September 24, 2015

Monarchs filled the sky as a cold front crossed Kansas. Butterflies dropped down by the dozens to nectar in the gardens below.

Off With the Wind
October 1, 2015

A continuous stream of monarchs crossed Oklahoma on Tuesday and the migration is poised to enter Texas next.

Monarch Butterfly Monarch Butterfly Monarch Butterfly

Funneling into Texas
October 8, 2015

”There were literally thousands, coming in big and small bands like snow flurries..." And so began the mass migration into Texas.

Crossing the Border
October 15, 2015

Butterflies are crossing the border and streaming into northern Mexico after another peak week in Texas.

Streaming Across Mexico
October 22, 2015

The monarchs are crossing Mexico on the final 500 miles of migration.

Monarch Butterfly Monarch Butterflies Arriving in Mexico Monarch Butterflies

Almost There...
October 29, 2015

First arrivals are expected any moment at the monarch's winter home in Mexico.

November 3, 2015

Crossing the finish line after a long migration.

They're Home!
November 24, 2015

The overwintering season in Mexico is now underway. Predictions say the population may have doubled since last year.

Spring Migration 2015
February - July
Monarch Butterflies Monarch Butterflies Monarch Butterflies

Waiting for the Count
January 1, 2015

The wintering season in Mexico is underway. Scientists will measure the population in December and announce the results by March. Will the monarchs have increased from last year's record low?

Monarchs at Risk
January 27, 2015

Monarch population count from Mexico: Numbers remain 80% below historic levels.

Highly Concentrated
February 5, 2015

Monarchs from across the continent are now clustered by the millions in a small region of Mexico. This year, half of the monarchs are concentrated in only one of the 12 overwintering sites.

Monarch Butterflies Nectaring Monarch Butterfly in Mexico Monarch Butterfly in Mexico

Help for Monarchs
February 9, 2015

The U.S. government announced a $3.2 million initiative for monarch conservation.

Surprisingly Cold
February 12, 2015

The monarch's winter home in Mexico is surprisingly cold. Temperatures often fall to freezing! Why do monarchs migrate to such a cold place?

Late-season Storm
February 19, 2015

Spring is approaching for monarchs in Mexico, but last week's hail storm proved that winter's not over yet.

Monarch Butterflies Monarch Butterflies Monarch Butterflies

In a Flurry
February 26, 2015

Thirsty monarchs break out of their clusters in search of water.

Activity Levels High
March 5, 2015

Within the month monarchs will vacate their winter haunt and begin the recolonization of North America.

Mass Departure Imminent
March 12, 2015

Mating is at its peak as the monarchs get ready to head north to the breeding grounds. Mass departure is imminent.

Monarch Butterflies Monarch Butterflies at Sanctuary in Mexico
Monarch Butterflies at Sanctuary in Mexico

Weather Delays
March 19, 2015

Cold temperatures are holding the monarchs back. We're still waiting for the mass exodus from Mexico and first arrivals in Texas.

Here come the monarchs!
March 26, 2015

Migration began with a mass exodus on Tuesday. The northbound butterflies carry the seeds of the next generation.

Migration enters Texas!
April 2, 2015

The monarch parade began on Sunday and continued all week. What will this latest-ever arrival mean for spring production?

Monarch Butterfly Laying Eggs on Milkweed Monarch Butterfly: Early Sighting in Minnesota Monarch Butterfly Laying Eggs

Following Milkweed
April 16, 2015

With milkweed paving the way, the leading edge of the migration is now 1,500 miles from the overwintering region in Mexico. How do monarchs find milkweed?

Fading Away
April 23, 2015

No longer their brilliant orange, the monarchs from Mexico are nearing the end of their travels. A new generation will continue the journey north.

April 30, 2015

A monarch lays eggs in your garden. What happens next?

Monarch Butterfly Laying Eggs Viceroy Butterfly Looks Like a Monarch Viceroy Butterfly Looks Like a Monarch

Eating and Growing
May 7, 2015

Here comes the next generation. Eating and growing, today's monarch caterpillars will soon be northbound butterflies.

Watch out for imposters!
May 14, 2015

This is not a monarch butterfly. How can you tell?

A New Generaton
May 28, 2015

Fresh, new butterflies — children of the monarchs from Mexico — surged northward last week. The number of eggs reported brings a hopeful start to the summer breeding season.

Monarch Butterfly Calender Wheel for Generations Monarch butterfly nectaring on milkweed

How Many Generations?
June 4, 2015

The grandchildren of the monarchs from Mexico are developing now. How many generations will this summer yield?

Almost Done!
June 11, 2015

Spring migration is almost complete. The population has now expanded from 3 acres of winter habitat in Mexico into 1 billion acres of breeding habitat in the US and Canada.

Migration Winding Down
June 18, 2015

The milkweed patch is the place to be. Egg-laying females are looking for milkweed, and males are looking for females.

Monarch Butterfly Nectaring on Milkweed Monarch Butterfly laying egg on milkweed

Explore previous migration seasons:

Fall 2014
Spring 2014

Peak Breeding Season
July 2015

The population builds with each new generation and will reach its peak when fall migration begins in August.

Tracking Migration with Journey North
Report your sightings to 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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