Bioluminescence Night Swim at Koh Hong

Bioluminescence at Koh Hong typically peaks during the warmer months (April to September) when the plankton concentrations are highest, though sightings can occur year-round. The effect is most visible on moonless nights or during the new moon phase.

Our night swim tours launch from Krabi in the early evening and return after dark. The tour includes a guide, life jackets and a briefing on the plankton. No prior swimming experience is required, though you should be comfortable in open water.

⚠️ Bioluminescence is a natural phenomenon and cannot be guaranteed on any given night. We reschedule or refund if conditions aren't right, we'll never send you out for a swim with nothing to see.