Monarch Fall Roost

Date: 09/01/2021

Number: 100

Hundreds of monarchs roosting in the backyard last evening 09/01/2021. Many of the beaches looked like this one. Maybe more than 100

[Additional information contributed by observer, added by Journey North, 09/17/21]:

For the last 5 years we have seen them roosting in the yard by never in numbers like this. Normally we will see 20-40 at a time. Counts there are easy. This year we saw roosts 4 times in normal numbers but for 3 days we saw the large number reported.

The wind was out of the south. When we see this it always is. When it goes to the north, they leave. I don’t recall the temp. We do have honeysuckle a vegetable garden and a number of flowering plants. Normally they roost in the shielded branches of our ash trees. For this event they were not only there but also in the river birch and the neighbors crabapple and maple. All shielded from the wind. Count was done by branch count on multiple branches and an estimate of some that were in flight

We had southerly wind yesterday and only saw a couple monarchs flying and no roosting so feel that the bulk of the migration may have passed.

Sioux Falls, SD

Latitude: 43.5 Longitude: -96.7

Observed by: Todd
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