OBX Moon Phase & Tide Calendar
How moon phase drives spring tides, neap tides, and the fishing bite on the Outer Banks — plus what to expect during each phase.
The moon is the biggest single driver of tides on Earth. Its gravity pulls a bulge of water that sweeps around the planet every 24 hours 50 minutes. The phase of the moon — new, first quarter, full, last quarter — tells you whether the sun is reinforcing the moon's pull (bigger tides) or pulling at right angles to it (smaller tides). On the Outer Banks this turns into a regular two-week cycle of spring tides and neap tides that affects surf fishing, beach driving, and inlet conditions.
The four moon phases and OBX tides
New moon — spring tide
Sun and moon are aligned on the same side of Earth. Their gravity stacks up. Tide range on the OBX swells to about 3.5 ft on the northern beaches and 1.5 ft at Hatteras — roughly 20% larger than average. Currents through Oregon Inlet and Hatteras Inlet rip faster. Surf fishermen and inlet anglers love the moving water.
First quarter — neap tide
Sun and moon are pulling at 90 degrees to each other. Tide range shrinks to about 2.5 ft at Duck and barely 1.0 ft at Hatteras. Slack tides last longer. Some anglers prefer this quieter water for sight fishing in the sounds.
Full moon — spring tide
Sun and moon are on opposite sides of Earth, but still aligned. Tide range hits its monthly peak. Full moon spring tides combined with onshore winds during fall are a classic flooding setup — Highway 12 on Pea Island and Ocracoke can overwash. Drum and stripers feed aggressively under a bright full moon.
Last quarter — neap tide
Same geometry as first quarter — sun and moon at right angles. Smallest tide range of the cycle. Beach driving on the soft sand between dunes and the wrack line can be safer with the smaller swing but the firm hard-pack at low tide will be narrower.
Spring tides vs neap tides — a cheat sheet
| Spring tide | Neap tide | |
|---|---|---|
| Moon phase | New or Full | First or Last Quarter |
| Range at Duck | ~3.5 ft | ~2.5 ft |
| Range at Hatteras | ~1.5 ft | ~1.0 ft |
| Inlet currents | Stronger | Weaker |
| Best for | Moving-water fishing, big-fish bite | Sight fishing, calmer flats |
| Beach driving | More firm sand at low tide | Narrower hard pack window |
The “king tide” phenomenon
A few times per year — usually around the autumn equinox and perigean full moon — the moon is at its closest point to Earth (perigee) during a spring tide. This produces a “king tide” with tide ranges 15 to 20% above an average spring tide. On the OBX a king tide combined with even a moderate northeast wind will overwash Highway 12 and flood low-lying parts of Manteo. The NPS often pre-emptively closes beach ramps during king tide events.