Get ready for an adventure like no other as the City Nature Challenge celebrates its 10 year anniversary between April 25 and April 28, 2025! 

Led by the community science teams at the California Academy of Sciences and the Natural History Museum of Los Angeles County, the City Nature Challenge is a four-day global habitat survey where cities come together in a collaboration-meets-friendly-competition to showcase their local biodiversity. It’s a chance for us to see what can be accomplished when we all work toward a common goal of understanding and coexisting with nature.

Are you up for the challenge? Here’s how you can participate:

  1. Download the iNaturalist app. It’s free and is available for both Apple and Android phones.
  2. Find Wildlife: Head out into your city and discover the incredible diversity of wildlife all around you. It can be any WILD plant, animal, fungi, slime mold, or any other evidence of life found in your city.
  3. Take a Picture: Use the iNaturalist app to photograph the plants and animals you encounter. It’s easy and free to use!
  4. Share Your Observations: Upload your photos to iNaturalist and share them with the global community of citizen scientists.

Join tens of thousands of people from around the world in the 10th annual City Nature Challenge and help us put nature in LA on the world map! And, if you’d like to join others participating in this challenge, here are a few local spots where City Nature Challenge events will take place:

Saturday, April 26, 2025 from 10:00 a.m. – 3:00 p.m.

UCLA Matias Botanical Garden, UCLA La Kretz Garden Pavilion, 707 Tiverton Drive, Los Angeles, CA 90095

Sunday, April 27, 2025 from 10:00 a.m. – 12 p.m.

Heal the Bay BioBlitz

BioBlitz in the Park, at Ballona Discovery Park, 13110 Bluff Creek Drive, Los Angeles, CA 90094

BioBlitz in the Marsh at Gardena Willows Wetland Preserve, 1202 W. 170th St., Gardena, CA 90247

Monday, April 28, 2025 from 9:00 a.m. – 7:00 p.m.

Descanso Gardens, 1418 Descanso Drive, La Cañada Flintridge, CA 91011

Started in 2016 as a friendly rivalry between Los Angeles and San Francisco, this international event has blossomed into the largest bio-blitz in the world, inspiring people from all walks of life to explore and document the wildlife in their own cities. Since its inception, 364,000 people in 1,100 cities and 66 countries have participated in the annual City Nature Challenge, generating an astounding 7 million observations. 

Don’t miss this chance to be part of something big. Together let’s uncover the wonders of LA’s urban wilderness!