To answer the question "When... in Thailand?", we first need to clarify what specific event or situation you are referring to. Here are some common contexts where the word "when" might be relevant:

• When to visit Thailand?

  Thailand has a tropical climate, so the best time to visit typically depends on the region you plan to go to:

  1. For the central region, including Bangkok, the best time is from November to February when the weather is cooler and drier.
  2. For the northern region, such as Chiang Mai, the ideal time is also from November to February.
  3. For the southern beaches, the best time varies: the west coast (Phuket) is best from November to March, while the east coast (Koh Samui) is ideal from January to August.
• When are the festivals in Thailand?

  Thailand is known for its vibrant festivals. Some major ones include:

  1. Songkran (Thai New Year) - celebrated from April 13 to 15.
  2. Loy Krathong - usually falls on the full moon night of the 12th lunar month, typically in November.
  3. Vegetarian Festival - occurs in October, usually in the first half of the month.
• When to book flights and accommodations?

  It's advisable to book your flights and accommodations several months in advance, especially if you plan to visit during the peak tourist season (November to February).

By clarifying the context of your question, we can provide a more specific answer. What particular event or situation are you interested in regarding Thailand?