Monarch Fall Roost
Sightings report image

Date: 09/30/2019

Number: 30000

Roost stayed for three days then left 10/2

Editor's note: contacted observer for more details on this sighting

Date the roost first formed? 9/28-10/1

Time of day did you observed them? Around 6:30 pm

How did you arrive at 30000 adults? They were scattered along a path way that was about 100 feet and then there were more grouped up on top a canal road next to the path way. It was hard to count so I just estimated how many were flying and in trees.

Were there nectar sources nearby? Along the pathway there are Russian olive trees, cotton wood and they are surrounded by farm land that includes alfalfa, wheat, milo, and corn. This area is full of natural native plants that all potentially provide nectar.

Overnight temperatures? The highs ranged from 95 and lows 67

Wind? Were the monarchs shielded from the wind in this location? The wind was in full force when they roosted. It was probably blowing between 30-50 that day with no real direction. Yes, there was plenty of coverage within the trees.

The photos are not great because the wind was so bad but I have attached video.

It really was an amazing unique experience. Each year we watch them pass through but not in the number witnessed that day.

Wiley, CO

Latitude: 38.2 Longitude: -102.7

Observed by: Samantha
Contact Observer

The observer's e-mail address will not be disclosed.
Contact will be made through a web-based form.


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