Koh Rok and Koh Ha Seasonal Closure for Koh Lanta Trips

Koh Rok and Koh Ha close to visitors every year from 16 May to 14 October. This is a standard, recurring national park conservation closure. Both islands sit within Mu Ko Lanta National Park's marine area, and the closure lets reef and marine ecosystems recover from tourism pressure during the rainy season, when rough seas make visiting less practical anyway. It's not a one-off or unpredictable closure; it happens on this same annual window.

If your trip falls within the closure period, day trips to Koh Rok and Koh Ha simply won't be bookable, tour operators pivot to other snorkeling and island-hopping destinations near Koh Lanta during those months instead, so it's not the end of your options, just a different set of islands. If snorkeling at these two specific islands is a priority for your trip, plan your visit for outside the 16 May–14 October window, i.e. broadly the mid-October-to-mid-May stretch.

Because closure dates are set by Thailand's national park authority and can occasionally shift slightly, always confirm current status with a tour operator or the national park directly if you're planning close to the boundary dates in May or October.

If you're travelling near the edges of the window, ask your tour operator whether a booking is refundable or changeable, as conditions vary. The national park authority is the official source for current status.

For alternatives and how the island trips compare, see our day trip and snorkelling guides.

Frequently asked questions