Event
City Nature Challenge
Become a community scientist by capturing observations of biodiversity from April 25 - 28, 2025, using the iNaturalist app. Join the iNaturalist project for your city or area, and head outside to snap photos of plants, fungi and wildlife.
Project Overview
iNaturalist Project Hub
Find all of the TNC-related iNaturalist projects for the 2024 City Nature Challenge. Projects for the 2025 City Nature Challenge will be added soon!
Additional Resources
Learn more about how to make observations on iNaturalist and discover the educational tools available to engage students of all ages.
Places We Protect
Explore TNC Preserves with Public Access
Looking for a nature preserve to hike, explore and make observations in during the City Nature Challenge? Check out this map of TNC properties, and select the "open to public" button to locate a natural area with public access near you.
How to Participate
Find bioblitz events to attend and make observations, or join an iNaturalist project for your area and contribute your observations on your own. You don't have to attend an event to participate; observations can be made from your backyard, a local park or any other outdoor location in your area! See events and iNaturalist projects below. All observations should be made from April 25 - 28, 2025.
Coming Soon!
Stay tuned for a list of our 2025 events and projects.