Home
Identifying Monarchs
Identifying Larvae
Report A Sighting
Monarch Hotspots
Tagging Monarchs
Request Tags
Report A Tag
Upcoming Events
Migration Map
Milkweeds
Plant Nurseries
Waystations
News
Brochure
Links
Support Us

Spring Migration North

Click here for Fall Migration South

Every Spring, monarchs begin mating around mid-February, then leave their overwintering sites in California, Mexico and the Southern United States looking for milkweed to lay their eggs. East of the Rockies their movement is generally to the north and northeast until mid-June, then they tend to stay in the local area. During the time of movement, there are several generations of butterflies, usually three to four. (There can be as few as two generations and as many as five each year.)

In most years in the East, by the time monarchs reach a latitude of 39 to 40 degrees (dotted yellow line) all the the monarchs who overwintered have died and the new generations move forward. How this works in the West is less well known.

However, citizen scientists have documented spring migration movement in several locations in the southwest.
  • Along the Colorado River on the Arizona-California border
  • In Tacna and Dateland in southern Arizona
  • Along the San Pedro River in Arizona
  • Along the Rio Grande River in San Antonio, New Mexico


Spring Migration Map

Unless specified otherwise, all data Copyright © 2010-2016 Southwest Monarch Study Inc. Information from this site may not be copied or distributed without prior written approval from Southwest Monarch Study

Webdesign Copyright © 2010-2017 Southwest Monarch Study Inc.