King tides occur around the new and full moons closest to perihelion, when Earth is closest to the sun in early January.
As purely astronomical events, king tides occur globally, so US and EU coastlines see their own king tides within hours of each other. In the absence of meteorological (weather-driven) inputs, high and low tides both tend to hit their annual extremes during king tide "season" — roughly the 6 or so weeks centered on perihelion.
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Perihelion 2026 happens to be today (Jan 3), and we have a full moon tonight! The resulting extreme low tide drew a huge crowd to see seldom-exposed tide pools on the rock reef at Cardiff Beach yesterday afternoon. Zillions more people than usual.
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K wanted to see the tide pools, too. Apparently, so did Mateo.
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We got even more extreme tides around the last full moon 4 weeks ago. I'd never seen the ends of this jetty out of the water, and here I was riding beyond them!
Coastal infrastructure is generally built (or rebuilt) to handle uncomplicated king tides with a certain margin of safety. The problem comes when a big surf event (typically from a distant storm), a storm surge, or a deep atmospheric low pressure system happens to roll in on top of a king tide, increasing water level, wave run-up, or both.
Much of the California coast is having that kind of bad luck right now. Most of our major storms and big wave events come out of the Gulf of Alaska, and storm season there happens to overlap king tide season.