Minus Tides Explained: The Best Low Tides of the Year

Scan a tide table and you'll occasionally see a low tide with a minus sign — -0.8 ft, -1.5 ft. That negative number means the water will drop below the average of the lowest low tides (a reference level called MLLW, mean lower low water). In plain terms: the ocean pulls back farther than it does on an ordinary day, exposing ground that spends most of the year underwater.

Minus tides aren't random. They arrive in clusters of three to five days around new and full moons — the same spring-tide alignment that produces the biggest highs also produces the deepest lows. The most dramatic minus tides of the year tend to come when a spring cycle coincides with the moon's closest approach to Earth, and in daylight they're an event: reefs, boulder fields, and sand flats you've never seen stand exposed for an hour or two.

Why anglers care

A minus tide is a scouting session no map can match. The trough that holds perch, the channel a halibut ambushes from, the boulder a big lingcod lives under — at a strong minus tide you can walk out and look at them. Photograph the structure at dead low, and you'll fish that spot with x-ray vision at every tide for the rest of the year.

The fishing around a minus tide is its own reward. A deep low means an enormous volume of water has to return on the following flood, so the incoming after a minus tide runs harder than usual — often the strongest, fishiest incoming of the month. Poke-polers work the exposed rocks at dead low; surf anglers fish the trough as it refills; clammers and tidepoolers get their only legal shot at ground that's normally three feet under.

Two safety notes that experienced coast walkers treat as law: know when the tide turns, because water that left over two hours can come back over flats faster than a casual walk — and never turn your back on the ocean on exposed rock. The chart on every location page shows exactly when the low bottoms out and how fast the water returns.

Finding them

Any location page on USTideCharts shows negative lows directly in the tide table — they're the entries below 0 ft — and pages call out when today includes a minus tide. Look at the 7-day view around the next new or full moon and you'll usually find the cluster. West Coast minus tides favor early morning in winter and spring; the best daylight minus tides in California typically land in May, June, and July.