City Nature Challenge: San Diego

Help San Diego Win

City Nature Challenge , which takes place from April 27-30, 2018, is a worldwide competition to see which city can make the most observations of their local plants and animals over a 4-day period. And San Diego composes part of one of only 35 biodiversity hotspots in the world, so we should have this in the bag!

The global event is organized by Natural History Museum of Los Angeles and California Academy of Sciences, and The Nat is spearheading our local effort. The goal is to document as many species as possible via your smartphone. The event begins Friday, April 27 at 12 AM PT and ends Monday, April 30 at 11:59 PM PT.

View a livefeed of results here .

Unlisted City Nature Challenge 2018: Which City Can Find the Most Nature?

Welcome to the 2018 City Nature Challenge! Over 60 cities will be competing to see who can make the most observations of nature, find the most species, and engage the most people in the worldwide 2018 City Nature Challenge.

Crowdsource for science!

You can participate by uploading photos and observations of wildlife in your neighborhood--or wherever you might be in the county that weekend. Are you a social butterfly? If so, we welcome you to participate in one of the many City Nature Challenge programs taking place around the county.

Leading Up to the Challenge


Challenge Day 1 | Friday, April 27

Challenge Day 2 | Saturday, April 28

Challenge Day 3 | Sunday, April 29

Challenge Day 4 | Monday, April 30

  • iNaturalist with Nat staff | The Nat | Monday, April 30, 11 AM – 3 PM

The Museum will announce the tallied results on Friday, May 4.

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 2018 City Nature Challenge: San Diego iNaturalist project
  3. Take photos from April 27-30 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

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 in partnering with us? Learn more about hosting your own event.

Host an event