Monarch Fall Roost
Sightings report image

Date: 09/01/2021

Number: 100

I saw hundreds of monarchs roosting for the night. Along the Ottawa Creek.

[Additional information contributed by observer, added by Journey North, 10/02/21]:

I noticed an increase of Monarchs flying around my house where I live on August 31-Sept 1. On September 1, there was a huge influx in the middle of the afternoon so I went back out in the evening after work. That was when I found the roost. Some of the butterflies were still there the next morning. But by the afternoon of September 2nd, they were all gone. We have seen a few monarchs straggling around ever since, but that would be about 2 or 3 a day.

Nearby nectar sources: A ton of wild grass and weeds (including milkweed). There is a large batch of wild grass/weeds that are owned by the City of Columbus. They are not kept up at all and grow wild so there is a bit of everything in there. This is right next to where the monarchs were sited.

Overnight temperatures were chilly but mild. I don't remember the exact temperature but I was definitely walking around in a tshirt and comfortable. It was not a terribly windy day.

Tree species: Cottonwoods, Black Walnuts, and a large willow oak tree. This is the back line of a wooded area. That spot is sheltered from North-South winds, but not really West-East winds. There are a few other trees along the woods as well, but those are the most common ones.

I didn't really count them because there were too many. There were large groups of them together spread out along the trees on the wood line (in the roosting packs). They were also flying around and darting from tree to tree.

Radnor, OH

Latitude: 40.4 Longitude: -83.2

Observed by: Ryan
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