City Nature Challenge Events
Get outside and photograph nature! Go out on your own or with others. You can even join our partners at the events listed below. Be sure to check back in as we will continue to add new events.
Can’t get outside? No problem. Take part from the comfort of a desktop computer and help identify the plants and animals people observe with their cameras. Find more information on how to identify observations.
We are encouraging everyone to follow recommended protocols related to staying healthy, keeping safe, and staying respectful of wildlife and wild spaces.
Leading up to the challenge
Thursday, April 10
Thursday, April 17
Thursday, April 24
Friday, April 25
Saturday, April 26
- Habitat Restoration & BioBlitz: San Diego River Estuary
- Guided Bird Walk at the San Diego Botanic Garden
- 8:30 AM, Saturday, April 26
- Hosted by the San Diego Botanic Garden
- Please note that this special guided walk is included with paid admission.
- BioBlitz at Crestridge Ecological Preserve
- Wander the Wetlands BioBlitz at Kendall-Frost Marsh Reserve
- 9 AM-11 AM, Saturday, April 26
- Hosted by UC San Diego Natural Reserve System and San Diego Bird Alliance
- Bilingual BioBlitz at Tijuana Slough
- 9 AM–11 AM, Saturday, April 26
- Bilingual English/Spanish & ADA Accessible
- Hosted by the San Diego Natural History Museum and San Diego Bird Alliance
- Creek to Bay BioBlitz and Cleanup
- 9 AM–12 PM, Saturday, April 26
- Hosted by San Diego Canyonlands and I Love a Clean San Diego
- BioBlitz at Cabrillo National Monument
- 9 AM - 5 PM, Saturday, April 26
- Hosted by Cabrillo National Monument
- Nature Hike: Dos Picos County Park
- 10 AM - 12 PM, Saturday, April 26
- Hosted by San Diego Natural History Museum's Canyoneers
- Nature Lab at the Library
- 10 AM–1 PM, Saturday, April 26
- Hosted by Coronado Public Library
- City Nature Challenge BioBlitz and Nature Walk
- 10 AM - 2 PM, Saturday, April 26
- Hosted by Batiquitos Lagoon Foundation
- Paradise Hills Native Garden Nature Challenge
- 11 AM-1 PM, Saturday, April 26
- Hosted by Paradise Gardeners
- Sweetwater Safari Hike
- 11:30 AM - 12 PM, Saturday, April 26
- ADA Accessible
- Hosted by Living Coast Discovery Center
- Afternoon BioBlitz at Elliott Chaparral Reserve
- Moth Night at Dairy Mart Pond
- Self-guided observations:
- Head outside and use the iNaturalist app to make observations of all the wild plants and animals you encounter in San Diego County. Check out the San Diego County City Nature Challenge project to take the challenge! New to the app? Check out our tutorial here.
Sunday, April 27
Monday, April 28
- Self-guided observations–San Diego County
- Head outside and use the iNaturalist app to make observations of all the wild plants and animals you encounter in San Diego County. New to the app? Check out our tutorial here.
Be sure to check this page for updates. We will add events as they are scheduled.
Want to host an event? Contact our community science team.
Border BioBlitz 2025
This year, City Nature Challenge overlaps with the 2025 Border BioBlitz/BioBlitz de la Frontera. The Border BioBlitz is a community science effort to record as many species as possible along the U.S.-Mexico border and is made possible thanks to partnerships with Botanical Community Development Initiatives, Next Generation Sonoran Desert Researchers, and community members like you!
To join the discovery, all you need is a smartphone with the iNaturalist app (free for Android and iOS) and to join the project. You can make observations on your own, or join a community Border BioBlitz event! By joining the project during the City Nature Challenge, you can ensure that your observations count for both!
Want to stay involved past this event? Learn more about The Nat’s ongoing community science projects.
