Firefly Watch: View & Explore Data

Lupines & Fireflies © Mike Lewinski (CC BY 2.0) via Flickr
Lupines & Fireflies © Mike Lewinski (CC BY 2.0)

Lupines & Fireflies © Mike Lewinski (CC BY 2.0)

2023 Firefly Observation Data

The map below shows firefly observation data. Click on an individual marker to see a participant's first and last recorded observations at that location. See the legend below the map for an explanation of the "fireflies seen" icons.

"Fireflies Seen" Legend

Icons indicate the average of all 3 counts submitted per observation period. 

1-5 fireflies seen
6-10 fireflies seen
11-25 fireflies seen
More than 25 fireflies seen

We worked with volunteers at Mapbox to create a visualization of firefly report density from the observations collected. Adjust the slider to see how the reported firefly numbers vary week to week through the summer.

View the map fullscreen >

Week of

"Visualization of firefly reports in 2023" created by Matthew Smith and Mapbox volunteers Lo Benichou and Sam Fader.

Previous Years

View firefly observation and density maps for previous years of the project.

Archived Data (2008-2016)

The Museum of Science in Boston spearheaded the Firefly Watch project for the 9 years. The data from 2008–2016 is available for download as a Microsoft Excel (.xlsx) file.