City Nature Challenge: San Diego

April 26-29, 2019
Calling all naturalists—San Diego can win with your help

Last year, during our inaugural participation in the City Nature Challenge, we placed in the top three for all three categories: number of species observed, number of participants, and number of observations. This year, we hope to place first across the board.

Not familiar with the City Nature Challenge? It’s a global competition to see which region can record the greatest number of observations of their local wild plants and animals over a 4-day period. And from April 26-29, The Nat is spearheading a local effort to get San Diego County residents and visitors to document as many species as possible using iNaturalist.

The City Nature Challenge begins Friday, April, 26 at 12 AM PT and ends Monday, April 29 at 11:59 PM PT. Results will be announced Friday, May 3 by organizing institutions, the Natural History Museum of Los Angeles County and the California Academy of Sciences.

How to contribute

Upload your photos and observations to iNaturalist. You can use a desktop computer or the app. Not familiar with the app? Not to worry, it’s super user-friendly. All you have to do is:

  1. Download the free iNaturalist app to your Android or iPhone
  2. Join the 2019 City Nature Challenge: San Diego iNaturalist project
  3. Take photos from April 26-29 to make observations of wild plants and animals in San Diego (in your backyard, at a park, etc.)
  4. Upload your photos to iNaturalist
  5. Learn more as the iNaturalist community helps identify your observations
  6. iNaturalist Best Practices (pdf)

Keep adding to the count!

You can upload and identify observations taken during the challenge up to and including the night of Thursday, May 2.


You can participate by uploading photos and observations of wildlife in your neighborhoodor wherever you might be in the county that weekend. We are currently working with partners to plan events around the County. Check back soon for an updated list of events.


  • iNaturalist Training | Location TBA:
    • Saturday, March 9, 9 AM - 12 PM

Want to stay involved past this event? Learn more about The Nat’s ongoing citizen science projects.

Partner with Us

Are you a nature-based or outdoor organization that wants to get involved and partner with us? Contact Citizen Science Manager Lauren Perez.


The City Nature Challenge is a wonderful opportunity to get your students outside and incorporate Next Generation Science Standards (NGSS) and STEM into your classroom. Create student iNaturalist projects using the following resources: