By Elizabeth Howard
The migration exploded across the northern breeding grounds, with 36% of the season's sightings reported in a single week.
This newborn Texas monarch will fly to the northern breeding grounds.
Monarchs rarely remain in the South to breed during the heat of summer.
Image by Jody McBeath
| What a week! People reported 179 new sightings, a dramatic increase over this spring's average of 26 sightings per week. The migration advanced another 200 miles northward, for a 2-week total of 450 miles. The northernmost monarch has now reached latitude 48°N in Thief River Falls, Minnesota.
Notice the delayed arrival in the East. There, the migration has only reached latitude 41°N in New Jersey, about 800 miles lower in latitude than the Minnesota sighting. Because of the distance and the delay, monarchs begin breeding later in the east than in the Midwest. This is one reason the eastern breeding grounds contribute less to the overwintering population. Generation Two Counting Generations
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| First Adult report | map | list |
Milkweed report | map | list |
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| First Egg report | map | list |
First Larva report | map | list |
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