Simple Tides / Guides / Spring vs. Neap Tides

Spring Tides vs. Neap Tides Explained

"Spring tide" has nothing to do with the season — it's about how the sun and moon line up, and it happens twice a month, every month.

What causes a spring tide

A spring tide happens around new and full moons, when the sun, earth, and moon are roughly lined up (a configuration called syzygy). The sun's and moon's gravitational pull combine, producing a bigger tide range: higher highs and lower lows than usual. The name comes from the tide "springing up," not the season.

What causes a neap tide

A neap tide happens around the first and third quarter moon, when the sun and moon are roughly at right angles to each other from earth's perspective. Their pulls partly cancel out, producing a smaller tide range: more moderate highs and lows.

Why the range matters

Bigger swings during spring tides mean faster-moving water between high and low, more exposed shoreline at low tide, and often more pronounced tidal current in channels and inlets. That matters directly for clamming, tide pooling, and paddling around current. Neap tides are gentler across the board, which can be easier for beginners or sensitive shorelines.

How to tell which one you're looking at

The easiest way is to check the moon phase alongside the tide chart: near new or full moon, expect a spring tide; near first or third quarter, expect a neap tide. Simple Tides shows moon phase and illumination right alongside each station's tide data.