Date: 10/10/2015

Number: 1000

My husband noticed some butterflies landing in our elm tree in the back yard. We then noticed the monarchs flying in our tree row north of the yard. We went into the tree row which has cedar trees and there had to be over a thousand. I took quite a few pictures. I was up the next morning at sunrise. Observed them warming up and gradually flying off. I took some amazing pictures. It was great to see! The time was around 6:00 mountain time. The date was October 10th. There is no nectar source nearby. The overnight temps were lower 50s. Wind direction was maybe north west. They were protected in our tree row.

I did not see any last night (10/11).

Editor’s note: Observer confirmed 10/10 is the night the roost formed.

Holly, CO

Latitude: 37.9 Longitude: -102.2

Observed by: Mary
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