San Mateo County King Tides

Photo Credit: Robert Most, SFO Airport.

What are king tides? King tides are higher than normal high tides that occur naturally when the sun and moon align, causing an increased gravitational pull on the Earth’s oceans. Since king tides are about a foot higher than average high tides, these events show what sea levels could look like every day with one foot of sea level rise.


King Tides and Coffee Events, December 4th

The San Mateo County Sea Change team is leading two King Tides & Coffee events on December 4th, 2017. The events will inform the public about how king tides can help visualize future flooding risks in the County and will share information about the projects the County and others are working on to reduce impacts from flooding, erosion, and sea level rise risk.


King Tides and Coffee at Mirada Road, 9 am – 10:30 am,  Agenda

King Tides and Coffee at Oyster Point Marina, 11:00 am – 12:30 pm,   Agenda


Snap the Tide, See the Future Photo Contest

Ready, Set, Snap! Participate in our first king tides photo contest and spread the word. The January 1st and 2nd king tides are coming, so mark your calendars and scope out the location, time, and height of the king tides in your community here. Grab your camera or smartphone, and take photos of any impacts you see from the king tides along the coast or bay in San Mateo County!

The king tide photo contest will capture current flooding and erosion impacts, including impacts to roads, highways, neighborhoods, and other infrastructure in San Mateo County. This is an opportunity to get involved in the sea level rise efforts in your community. Together we can plan ahead and prepare for sea level rise. A panel of local judges will select three winners based on the following criteria: 1) photographic composition, 2) effectiveness at portraying the high tide and associated flooding impacts, and 3) a creative narrative. Send your photos to Montserrat Plascencia ( by JANUARY 12th. The winner will be announced in February.

Photo Credit: Dave R, Pier 14.

The three winners will win a climate change mug that shows the sea currents change and coastlines disappear when you add a hot beverage.

The images will be hosted on the Sea Change SMC website, and will be used as outreach and informative visuals in our sea level rise efforts. Please review the Photo Contest Guidelines to identify locations, see king tide schedule, and learn best practices for your photo shoot.