As of today, out of season, returns ~November. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Frost flowers are transient, dendritic ice crystals that form on new and young sea ice when relatively warm, saline surface ice and brine interact with very cold, calm air.
In the Baltic Sea and coastal Finland they appear during freeze-up and early winter on sheltered bays, leads, and refrozen leads, and are important for sea-surface chemistry and aerosol exchange.
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 |
|---|
| Kemi - Ajos harbour / northern shore viewing (Bothnian Bay) |
| Hailuoto - Marjaniemi / west shore (Bothnian Bay near Oulu) |
| + 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.