Monarch Butterfly Migration Update: May 30, 2003
Today's Report Includes:
News From the Migration Trail
What dramatic changes this week’s migration map shows!
- Monarchs have now reached latitude 46.92N in the upper Midwest, surpassing
last week’s northernmost sighting at 43.55N in South Dakota by
250 miles. (The sightings themselves were 9 days apart, meaning the
migration advanced at a pace of 28 miles per day.)
- A very clear migratory wave moved into Minnesota and Wisconsin. Where
not a single monarch had been seen before May 24, 19 were reported in
the space of 5 days--and three more after today’s map was made!
Of this week’s 36 sightings, 53% were from those two states.
- Take a close look at the distribution pattern shown on today’s
map. The same northward pulse did not occur in the East last week. There,
the northernmost sighting is at only 42.83N. And, other than two reports
from upstate New York, no other monarchs were reported after May 23
(pink dots). The previous week the migration had advanced along the
Atlantic Coast as far as New Hampshire border. Why is the migration
lagging behind in the East, and especially inland? Will the migration
surge northward next week by 250 miles as it did in the Midwest?
- If you’re keeping track of states and provinces where monarchs
have arrived, you can add three new states to your list--Minnesota,
Wisconsin, and Colorado: Monarch
Spring Migration Route Prediction Chart
- Look at this map of the monarch’s breeding range. Can you list
the remaining states and provinces the monarchs must reach before their
migration is complete?
Milkweed Emerging Along the
The monarch's host plant is now available across its breeding range in the
United States, and into southern Canada. If you live in an area where milkweed
has not yet been reported, please let us know when it has emerged.
Stay Tuned: The Monarch Migration
Other Journey North migrations have come to an end, but we'll continue to
track the monarchs until they've expanded across their entire breeding range.
This normally takes until mid-June.
Please Help: YOUR Monarch
Sightings Are Important
Even after the first monarchs have been reported from your state or province,
we want to hear from YOU when you see YOUR first! The number of sightings
reported reflects monarch abundance, so your observations will continue
to be important.
The Next Monarch Butterfly Migration
Update Will Be Posted on June 6, 2003
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North. All Rights Reserved.
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