As of today, out of season, returns ~March. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Every spring Pacific herring (Clupea pallasii) aggregate in Sitka Sound to spawn on shallow kelp and eelgrass.
Spawning produces dense egg mats and milky nearshore water, feeding seabirds, marine mammals, and intertidal communities.
Timing is strongly tied to local sea temperature and tides and can vary year to year.
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 |
|---|
| Sitka Downtown Waterfront (Sitka Harbor) |
| Sitka National Historical Park shoreline |
| + 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.