December 2025 King Tides in Alviso

The December 2025 King Tides event is being held concurrently in two different locations on the Refuge: Alviso and Pond SF2 (Menlo Park). The same content will be covered. Visit our page if you want to attend the Pond SF2 event instead.

Join us at the Refuge in Alviso for a guided walk and discover how the highest tides of the year give us a glimpse into the future of sea level rise. We'll learn what King Tides are, how sea level rise is reshaping our coastal communities, why habitat restoration matters and how you can contribute as a community scientist.

We’ll walk along Refuge trails, observe plant adaptations and discuss the impacts of rising oceans. You’ll also learn how to contribute to the California Coastal Commission's King Tides Project by uploading photos through the Survey123 app - a statewide effort to record changes to our coast and estuaries. Your photos will be added to a map of this season's King Tides photos.

The King Tides also highlight the issue of urban runoff pollution. Trash, toxic chemicals, and other pollutants not normally reached by the tides will be swept into the Bay, affecting humans and wildlife. For information on how you can help keep our watersheds and the Bay clean by preventing urban runoff pollution, visit: http://www.mywatershedwatch.org

This interactive event is suitable for all ages and will take place rain or shine.

Photo by Hope Presley

This program is brought to you by San Francisco Bay Wildlife Society (SFBWS) and Santa Clara Valley Urban Runoff Pollution Prevention Program (SCVURPPP).

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Host or Publisher Don Edwards SF Bay National Wildlife Refuge