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Clear water and a white-sand beach on an island near Koh Lanta

Koh Rok, Koh Ha and Koh Kradan: Koh Lanta's Day-Trip Islands

Koh Rok, Koh Ha and Koh Kradan: the uninhabited day-trip islands south of Koh Lanta for snorkeling and beaches, plus the seasonal closure explained.

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A full day, about 7 to 8 hours South of Koh Lanta, boat trips from the island Koh Rok and Koh Ha close 16 May to 14 October

South of Koh Lanta lies a cluster of islands that make up the classic day trips from the island. Koh Rok and Koh Ha are prized for snorkelling and clear water; Koh Kradan, in neighbouring Trang province, is known for a beautiful white beach. They are among the main reasons visitors leave the beach behind for a day at sea.

What each island offers

  • Koh Rok: a pair of islands with a bright white beach and coral reef right off the shore, popular for snorkelling. The islands are part of Mu Ko Lanta National Park and are closed seasonally.
  • Koh Ha: a group of small islands with clear water, sheltered lagoons and rock formations, another favourite snorkel stop.
  • Koh Kradan: a laid-back island with a long white beach, often the lunch stop on 4-island tours.
  • The boat ride itself: the journey by speedboat or longtail is part of the experience, with views across the Andaman Sea.

Season, closures and how day trips work

Koh Rok and Koh Ha close to visitors every year from 16 May to 14 October as part of a national park conservation closure. If snorkelling there is a priority, plan your trip outside this window. During the closure, operators switch to other islands.

Day trips depart from Koh Lanta with hotel pickup, and typically include lunch, snorkelling gear and a boat transfer. Prices, itineraries and inclusions vary, so check details on the booking page. A national park fee may be extra.

Sea conditions can affect schedules even in the open season. Bring reef-safe sunscreen, a hat and a towel, and be prepared to be flexible.

For the full picture, including which islands to pick and what to expect, see our guide to day trips from Koh Lanta.

Day trips to the islands

Itineraries differ between operators, so confirm which islands are included before booking.

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Frequently asked questions

Every year from 16 May to 14 October. This is a recurring conservation closure set by the national park.

Koh Rok and Koh Ha seasonal closure

Koh Rok and Koh Ha are the top snorkelling stops. Koh Kradan is more about the beach. Our comparison breaks it down.

Koh Rok vs Koh Ha snorkelling tours

A 4-island tour gives variety in one day, while a dedicated snorkelling trip spends longer on the reef. Compare the itineraries.

Best 4-island tours compared

Last updated September 2026.