Is Mayfly Hatch on English Chalkstreams happening right now?
As of today, past peak, season runs to ~June 30. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Each late spring, multiple mayfly species emerge en masse from England's chalkstreams, producing clouds of adult insects above the water and dense surface activity.
These hatches are tied to water temperature and stream productivity, and are especially notable on classic chalk rivers in southern England.
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 |
|---|
| River Test at Stockbridge |
| River Itchen around Winchester |
| + 2 more spots, 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.