
City Nature Challenge (CNC) is an annual, global event using iNaturalist that encourages people in cities around the world to observe and document the biodiversity present in their urban environments.
The CNC takes place every fourth weekend of April, starting from Friday through Monday. Cities compete with each other in a friendly competition to see which location can document the most species in their local area.
The City Nature Challenge promotes citizen science, environmental education, and awareness of urban biodiversity, fostering a greater connection to the natural world. City Nature Challenge is among the several approved Citizen Science Projects.


iNaturalist and the City Nature Challenge directly support the goals of Master Naturalists.
- Cultivates a connection between individuals and their local nature in urban and metro areas.
- Fosters community building by organizing in-person walks, public outreach events, and online training sessions focusing on local flora and fauna.
- Utilizes the iNaturalist application to conduct field research and gather urban biodiversity data. Share this data with AAMN Partners, including Texas Nature Trackers, City of San Antonio Parks and Rec, San Antonio River Authorities, and other collaborators. The collected information will play a crucial role in informing policy and management decisions related to the urban environment.
- Encourages increased volunteer participation in biodiversity documentation within the Alamo Area Chapter and the wider public.
- Sparks enjoyment and engagement through friendly competition and collaboration!

History of San Antonio’s participation in the City Nature Challenge
Observations

Species

Observers

Explore the history and data of the City Nature Challenge San Antonio Metro Area

Volunteer Opportunities
With the full backing of AAMN, there are many ways to participate in the City Nature Challenge:
- Captain a team in the Teams Tournament
- Volunteer on an iNaturalist walk
- Join in the Class vs Class competition to see which class has the most observations
- Promote the Challenge by sharing information with your friends, neighbors, and community organizations. Encourage them to engage in their unique Community Nature Challenge.
- Help with identifications during the post-observation period.
- Explore outdoors and make your own nature observations using iNaturalist.
Volunteer with City Nature Challenge
To learn more about the event and sign up for the newsletter, visit the City Nature Challenge San Antonio Metro Area website and follow the challenge on Instagram and Facebook.



