As of today, out of season, returns ~August. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Each late summer, multiple reef-building coral species at the Flower Garden Banks National Marine Sanctuary release gamete bundles in synchronized mass spawning events.
The multi-species broadcast spawning typically occurs on a small number of nights tied to the late-summer lunar cycle and warm water temperatures, creating a brief window for unique night dives and scientific observation.
Where to see it
A taste of where to see it. The full map, exact coordinates and the best timing for each spot live in the app.
| Viewing spots |
|---|
| East Flower Garden Bank |
| West Flower Garden Bank |
| + 1 more spot, with exact coordinates and timing, in the app → |
This is the short version
This page shows a taste. The app has the full list of where to see this, the exact timing, and live conditions for 1,000+ natural phenomena worldwide, so you know the moment one is genuinely worth the trip.