At a traditional roost site in Frederick, Oklahoma an estimated 4,000 monarchs arrived on October 1st. They stayed in large numbers until a cold front arrived on October 6th:

"Unfortunately a hailstorm hit the roost site that night. Miraculously, we only found 15 dead monarchs the next morning. The next night only 400 straggled in. The cold front made a huge difference!"

— Melynda Hickman, Flat Wildlife Management Area October 8, 2016

Melynda Hickman

 

Copyright Journey North (journeynorth.org). All Rights Reserved.