Monarch PEAK Migration
Sightings report image

Date: 09/21/2021

Number: 65

Photo taken 7:09 pm on Tuesday Sept 21. Sunset was 7:18. The timing of this photo was when butterflies were still arriving to roost overnight on Tuesday.I came up with this number by adding 15 to the number of butterflies I could see roosting in the black willow the following morning at sunrise, separately reported under fall roost. The 15 represent butterflies that flew to and around other trees. Likely undercounted. Also saw a black swallowtail.

Unfortunately I had to leave on Wed morning before the temperature warmed up enough for any of the monarchs to depart after sunrise.

On Monday Sept 20 a massive number of monarchs were caught on radar coming across NW and central OK headed S/SE from the direction of Colorado.

Does OK have two peak migrations? The first comes from the direction of eastern CO. The second will be from the I-35/I-44 corridors, in my experience this is during the first week of October.

I checked again on Thursday morning before sunrise. Very few monarchs in the willow. Again I had to leave before could count departing monarchs.

Oklahoma City, OK

Latitude: 35.5 Longitude: -97.5

Observed by: Barbara
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