As of Jun 15, 2026, 3:43 PM, past peak, season runs to ~June 30. Earth Exhibit tracks the live conditions and flags it the moment it is on.
Each spring and early summer Cuc Phuong National Park (Ninh Binh, Vietnam) hosts mass butterfly activity by day and large nightly firefly displays after dusk.
Butterflies concentrate along forest trails and clearings in April-May, while guided night tours and local trails reveal fireflies from early April through June.
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 |
|---|
| Cuc Phuong Visitor Centre / Park Main Gate |
| Con Moong / Prehistoric Cave area (Trailhead) |
| + 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.