The tide calendar.

How to read this

Duxbury runs a big tide, routinely nine to eleven feet between low and high. The chart reads like a wall calendar: each box is one day, and its tides are listed in the order they happen, highs in gold, lows in gray, each with its height in feet after the time. Gold boxes with a ▲ mark days when high water tops 11 feet, the month's true monsters. A ▼ flags below-datum lows, when the bay turns into a half mile of walkable sand. Two cautions from experience: the flats fill back in faster than they empty, so track the time on a long walk out, and predictions are astronomy, not weather. A strong onshore wind or a storm can push real water noticeably above these numbers.

October 2026

October opens and closes with big water. The month starts on the tail of a perigee spring tide, with highs over 11 feet through the 3rd. Then the real event: the Hunter's Moon turns full just after midnight on the 26th, and two days later the moon makes its closest pass of the month. Stack those together and you get the biggest tides since mid-July, topping out a hair over 12 feet on the afternoons of the 28th and 29th, with Halloween still running above 11. (Thanksgiving week will edge them out, at about 12.3.) The matching lows drain to nearly a foot below datum, but they land around dusk, so the best flats of the month are a sunset walk with a flashlight in your pocket. Expect water on the low roads at Powder Point and along the marsh edges on those afternoons, more if an onshore wind joins in.

Early November

A look ahead to the first half of next month. Clocks fall back on Sunday, November 1, and the times below already account for it.