City Nature Challenge

City Nature Challenge participation is easy:

• Download the FREE iNaturalist app. Find instructions for downloading the app on the iNaturalist website or go directly to the app store.
• Take photos of plants, animals, insects, and other life forms. You can do this anywhere across the bi-state* region.
• Upload your images on the greater St. Louis region's iNaturalist page.

City Nature Challenge 2026 will be April 24–27! Check back for links and more specific directions.

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City Nature Challenge 2025

April 25–28, 2025

Results are in from the 2025 City Nature Challenge! Thank you to the many partners and participants that helped make 2025 a success.

• Total observations – 10,557
• Total species observed – 1,754
• Total observers – 508
• 37 percent of species research-grade
• 343 identifiers