Know the hours the ocean gives back.
A few times a month, a very low tide lines up with daylight — and the coast opens up: tidepools, sandbars, sea caves, glass beaches. Tidewindow computes those exact hours for US beaches from NOAA predictions, scores them, and ranks them. No tide-table squinting.
The best window in America right now
computed 2026-07-04 · NOAA CO-OPSSeattle (Puget Sound) — Jul 11, 2026 (Sat): the tide drops to -2.3 ft at 8:49 AM, giving 4h 35m of walkable daylight (6:35 AM–11:10 AM). 100 · Exceptional
Computed tide curve · shaded band = below +1.0 ft · gold lines = sunrise/sunset · full Seattle (Puget Sound) guide →
Top windows, next 30 days
Seattle (Puget Sound)WA
100 · Exceptional(Sat) · -2.3 ft at 8:49 AM
Walkable 6:35 AM–11:10 AM · arrive by 7:49 AM
Seattle (Puget Sound)WA
100 · Exceptional(Sun) · -3.2 ft at 9:40 AM
Walkable 7:15 AM–12:10 PM · arrive by 8:40 AM
Port TownsendWA
100 · Exceptional(Sat) · -2.4 ft at 7:58 AM
Walkable 5:20 AM–11:10 AM · arrive by 6:58 AM
Port TownsendWA
100 · Exceptional(Sun) · -3.1 ft at 8:47 AM
Walkable 6:00 AM–12:10 PM · arrive by 7:47 AM
La Push (Olympic Coast)WA
97 · Exceptional(Sun) · -2.1 ft at 5:35 AM
Walkable 3:00 AM–8:15 AM · arrive by 4:35 AM
La Push (Olympic Coast)WA
95 · Exceptional(Fri) · -2.0 ft at 9:26 AM
Walkable 7:05 AM–11:45 AM · arrive by 8:26 AM
Seattle (Puget Sound)WA
90 · Exceptional(Mon) · -3.7 ft at 10:31 AM
Walkable 8:00 AM–1:05 PM · arrive by 9:31 AM
Seattle (Puget Sound)WA
90 · Exceptional(Tue) · -3.8 ft at 11:20 AM
Walkable 8:50 AM–1:55 PM · arrive by 10:20 AM
Computed, not written
Every window on this site is arithmetic over NOAA harmonic tide predictions intersected with the sun's actual position. The methodology is public, and the numbers regenerate every day.
Scored honestly
Depth, daylight, weekends, season — one 0–100 score. When a week is a washout, we say “skip it” and show you the next date that isn't.
Yours to keep
Any beach's next 12 months of good windows as a calendar feed or a printable year view — plus a weekly alert for your stretch of coast.
The Minus Tide Alert
One email a week: the exact hours your coast is worth the drive — computed from NOAA data, never padded. Starting this season.
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