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Boston Area City Nature Challenge

THANK YOU to everyone who participated in this year's City Nature Challenge! We are so proud of what we accomplished this year. Out of 419 cities in 44 countries, the Boston Area team:
  • Placed 8th in number of observations
  • Had the 3rd highest number of participants
  • Placed 14th for the number of unique species observed
View Full Results

The City Nature Challenge is an annual effort to document urban biodiversity within the I-495 corridor, out to Stellwagen Bank, including Cape Cod and islands. In this bioblitz-style competition, cities around the globe are in a contest against each other to see who can make the most observations of nature, find the most species, and engage the most people. It’s simple, it’s fun, and it contributes to scientific data helping to better understand our world and our non-human neighbors.




In 2020, 1,069 volunteer observers recorded 15,347 observations of 1,702 species. For 2021, we'll build on prior success. You can participate safely, even during this time of pandemic. The effort is local; you can maintain social distance; and it helps to document biodiversity! Go slow and steady to explore in detail the biodiversity near you.

The information volunteers like you collect helps create a more accurate picture of biodiversity at this time of year. Any observation of wild plants, animals, fungi, even microbes, that are recorded with iNaturalist, is automatically included in the data for our collective annual challenge.

Join the Boston Area City Nature Challenge!

Step 1. Download the iNaturalist app and create an account.

• Download the app (easiest): Android App (Google Play) iOS App (iTunes), or use iNaturalist online.
iNaturalist "Getting Started" Guide.

Step 2: Record your observation with a photograph and upload the photo to the app.

Step 3: Confirmation

The iNaturalist community discusses and confirms the identity of the observation and lets you know.

Get Involved

CNC 2020

iNaturalist Project Page

bee on flower

Online Resources


Data Quests

Education Box1

Educator Resources

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About Us


The Boston Area City Nature Challenge is a collaborative project. Learn more about our effort here or email us at

Get social with the City Nature Challenge! Facebook |Twitter | Instagram

 CanaturalsciencescncThe City Nature Challenge is being organized on a global scale by the California Academy of Sciences and the Natural History Museum of Los Angeles County.