Monarch Population in Mexico

Population Highest Since 2006
January 30, 2019

Scientists cheered today at a press conference in Mexico City when this year’s official monarch population estimate was announced.

The clustering butterflies cover 14.9 acres (6.05 hectares) of forest, the highest recorded since 2006 and an increase of 144% from last winter.

The annual measurements are made at Mexico’s overwintering sanctuaries every December and are considered the annual ‘report card’ on the status of the monarch population. The population has been on a downward trend for the past decade, and fell to a record low of 1.65 acres (0.67 hectares) in winter 2013-2014.

The target for monarch recovery is a sustained population of 15 acres (6 hectares). So while year's 6.05 hectares is welcome news, the monarch population fluctuates up and down naturally (see graph). Thus, monarch habitat must consistently produce higher numbers of butterflies than the levels seen during the past decade.

Monarch Population in Mexico

Resources to Explore

Monarch butterfly population in Mexico: Chart How many millions of monarch butterflies in Mexico? Monarch butterfly population in Mexico: Chart
Journey North
Historic Records
Elizabeth Howard
How Many Millions?
Journey North
Prediction for Future?
Map of monarch butterfly sanctuaries in Mexico. Monarch butterfly colony site selection in Mexico Monarch butterfly colony site selection in Mexico
Journey North
The Twelve Sanctuaries
Journey North
Evenly Distributed?
Journey North
Same Each Year?
Estimating the area of monarch butterfly winter colonies in Mexico Estimating the area of monarch butterfly winter colonies in Mexico Estimating the number of monarch butterflies winter colonies in Mexico
Dr. Lincoln Brower
Estimating Area
Wikipedia
How Many Football Fields?
Dave Kust
Estimating Numbers
 
Monarch butterfly migration map

Population Decline
Monarch numbers are down and people are wondering why. This article examines the factors that caused the decline during the past year and the downward trend over the past decade. Also, see how you can help.

 

 

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February January March