On Sept. 6, 2016, it happened.

A monarch fluttered into our pollinator garden in Vacaville and touched down on a Mexican sunflower, Tithonia rotundifola.

It wasn't just "any ol' monarch"--if there's ever such a thing as "any ol' monarch."

This one, tagged with my alma mater, Washington State University, came from Ashland, Ore., as part of a migratory monarch research project launched by entomologist David James.

The tag's serial number read  “Monarch@wsu.edu A6093.”  It hung around for about five hours and then left.

James, an associate professor at Washington State University,  studies the migration routes and overwintering sites of the Pacific Northwest Monarch population, which overwinter primarily in coastal California. (Access his Facebook page, Monarch Butterflies in the Pacific Northwest, for his latest research.)

When we emailed him, we learned that citizen scientist Steven Johnson of Ashland tagged and released the monarch on Sunday, Aug. 28. 

"So, assuming it didn't travel much on the day you saw it, it flew 285 miles in 7 days or about 40.7 miles per day," James told us. "Pretty amazing. So, I doubt he broke his journey for much more than the five hours you watched him--he could be 100 miles further south by now."

Repeat: 285 miles in 7 days, or 40.7 miles per day. Incredible.

Fast forward to today. It's the anniversary of the sighting of A6093.

Any sightings today? Not. A. Single. One.

And not a single sighting of a tagged monarch since Sept. 6, 2016.