Coastal Hiking Tide PlannerPlan by the tide
中文EN
Free toolNo sign-upWorks offline

Tide Window Planner

Choose your activity and the next high tide time, and we colour the next 72 hours green, amber or red — so you walk, wade or camp only when the water lets you.

Plan my windowsHow it works

Colour the next three days

Simplified harmonic model · verify with official charts

From your local tide table.

Pick your activity, enter the next high tide time, then press Plan my windows.

How it works

How windows are decided

The height model
We approximate the tide with the M2 lunar wave (12.42 h) plus the small S2 solar wave for semi-diurnal coasts, scaled so the peak-to-trough height matches the range you entered. On diurnal or mixed coasts we swap in the longer constituents.
Activity thresholds
Tidepooling needs near-flat water (|h| within 0.35 m of mean). Hiking and cliff paths stay safe below 60% of the half-range. Fishing is best on the rising tide between −0.3 m and 70% of the half-range. Camping ground must stay above 0.35 m. Anything within 0.3 m of a threshold is flagged CAUTION.
Why colour, not just numbers
A colour strip makes the pattern obvious at a glance: long green blocks are your real windows; the red flood blocks are when low paths disappear. Always confirm against the official local table before you go.
⚠️
Safety first. Tide predictions here use a simplified harmonic model for planning only and may differ from official charts. Always check the official local tide table, lifeguard advice and on-site signs before you go. The sea can turn quickly — if in doubt, turn back.
Related tools

Pair this with

Tide

Tide Predictor & Curve

Plot the full 3-day tide curve.
Tide

Cut-Off Risk Timer

Countdown to the moment the path floods.
Tide

Spring & Neap Calendar

Big tides or small? Check the moon.
Activities

Tidepooling Finder

Best low-water windows for tide pools.

Read next

Understand the rhythm

Tutorial

The Moon's 12.42-Hour Rhythm: How Tides Actually Work

The two cycles that move every shoreline.

Read the guide →
Scenario

Getting Cut Off: Walk Planning That Keeps You Safe

A method that stops the most common coastal rescue.

Read the guide →
We use cookies to remember your favorites and tool usage.Privacy Policy