Data Analysis

Help Interpret Our Data

Calling all chart enthusiasts, students with science projects, and number crunchers: you're invited to interpret our firefly data. Since the end of last year, we've made each season's entire data set available from this site. Curious about firefly counts on cloudy nights, or the number of habitats near a cultivated bog? The Excel file contains all of the information you need to track whatever aspect of the data you like.

If you think you've created something that would be beneficial to the Firefly Watch community, send it to us at We'll post the best examples to this page so everyone involved with the project can benefit from your hard work. Your chart could also be featured in the Firefly Watch Update enews!

Full Data Set

This Excel file contains all of the data from the 2008 - 2014 seasons. It's divided into three data sets: habitats, observations, and individual firefly reporting.

First and Last Sightings

This chart and map uses the combined observation data from 2008 - 2013 to show when fireflies were first and last seen across the country, along with the number of observations and habitats reporting in each place.

Although this is not a comprehensive data set, it can offer an indication of when participants in the different areas can expect to see fireflies in their region.
Download (PDF)

When you join Firefly Watch, you're not only tracking firefly sightings in your yard; you're also helping local scientists with their research.
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Observing fireflies is a great summer activity. Join our network of volunteers and track your sightings throughout the season.
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Pick a location, observe it weekly, and use our online tools to follow your progress.
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Wear bug spray to protect yourself from mosquitoes, but take caution if you're handling fireflies.

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