As of today, peak season now, through ~June 25. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Each late spring and early summer, burrowing mayflies (Hexagenia spp.) emerge from Lake Erie sediments as synchronized, short-lived adults to mate.
On warm, calm evenings large swarms rise from shallow nearshore waters and accumulate along beaches, piers, and bays, creating visible clouds of insects and brief, intense local events.
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 |
|---|
| Sandusky Bayfront Park (Sandusky Shoreline) |
| East Harbor State Park Beach (Marblehead area) |
| + 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.