Swarm Sunday: 6/21/15 – 6/27/15

Dragonfly Swarm Project logoIt’s Sunday, so time for this week’s swarm report!  Swarms occurred in the following locations over the past week:


Mobile, AL
Aurora, CO
Boulder, CO
Broomfield, CO (2 swarms)
Centennial, CO
Denver, CO (3 swarms)
Longmont, CO
St. Charles, MO
Long Branch, NJ
Cayce, SC
Spokane, WA


Hoi An

And here is the US map for last week:

swarm map 6.21.15 to 6.27.15


Red pins are static swarms, yellow pins are migratory. Click the map to enlarge!

Clearly there’s something interesting going on in Colorado!  Everyone is reporting flooding and severe storms there, so it looks like a disturbance in the area is stirring up the dragonfly population pretty well.  That seems to happen periodically in Colorado – big storms or fires or floods produce big dragonfly events for a few weeks.  We’ll see if it lasts into next week.  Otherwise, just a few reports scattered across the country, i.e. the normal conditions for this time of year.  Also, a new country for the list where swarms have been reported to date: Vietnam!  That brings the total up to 31 countries, which really highlights the fact that a variety of species do this behavior and it’s not specific to a certain area or group of species.

The season should be picking up soon, so send in reports of any swarms you see!


Have you seen a dragonfly swarm? I am tracking swarms so I can learn more about this interesting behavior.  If you see one, I’d love to hear from you!  Please visit my Report a Dragonfly Swarm page to fill out the official report form.  It only takes a few minutes! Thanks!


Want more information? Visit my dragonfly swarm information page for my entire collection of posts about dragonfly swarms!


Unless otherwise stated, all text, images, and video are copyright © C. L. Goforth