Firefly Watch: View & Explore Data
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.
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1-5 fireflies seen
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6-10 fireflies seen
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11-25 fireflies seen
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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.
Week of
Previous Years
View firefly observation and density maps for previous years of the project.
- 2022 observation maps
- 2021 observation maps
- 2020 observation maps
- 2019 observation maps
- 2018 observation maps
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.