Thirteen Chinese tourists and their local guide were let off with a fine of Rs 50,000 for entering the Valley of Flowers, a UNESCO World Heritage Site, in off-season.
The valley opens in June and closes in October every year.
Established as a national park in 1982, it was declared a World Heritage Site by UNESCO in 2005. Nearly 300 species of flowers bloom in the valley, spread over an area of 87.5 sqkm.
The Chinese team, on a holiday trip, had a tourist visa when they reached the national park without knowing that it was closed, a forest official said.
The tourists were reportedly heading towards Ghangharia inside the valley in border district of Chamoli when a forest team spotted them on Monday.
Divisional forest officer CS Joshi said local intelligence unit was alerted about the foreigners.