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City Nature Challenge: Chicagoland Region 2025


With 3,297,129 observations in worldwide, the results are in and the 2025 City Nature Challenge: Chicagoland Region brought the energy! Thanks to all the partners across the region who hosted events in 2025. Check out the City Nature Challenge results from across the globe and see how our shared work makes a difference for science!

If you didn't make it to a City Nature Challenge event, you can still explore the nature in your community and add your observations to iNaturalist at any time of year.

If you're ready to think about the 2026 City Nature Challenge: Chicagoland Region, visit its page on iNaturalist.   

Eligible counties in our region are:

  • Illinois: Cook, DuPage, Grundy, Kane, Kankakee, Kendall, Lake, McHenry, Will
  • Indiana: Jasper, Lake, Newton, Porter
  • Wisconsin: Kenosha

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2025 Events

Illinois

Indiana

Virtual and Global Events

View participating cities worldwide or join a virtual event from where ever you are!

City Nature Challenge cities participating map

Resources and Links

About the City Nature Challenge

Using iNaturalist

Presentations, Podcasts, and Other Resources

How to Make an Observation on iNaturalist using our Mobile App from iNaturalist on Vimeo.

Partners

City Nature Challenge

 

To join the organizations and people who will make the City Nature Challenge: Chicagoland Region possible, contact cassi saari (Chicago Park District). Questions or comments about the global City Nature Challenge can be directed to the international organizers.