How soon can I apply for a visa extension in Thailand after using the 60-day exemption?

For a 60-day visa exemption followed by a 30-day extension, most immigration offices in Thailand typically allow you to apply for the extension when you have 30 days or less remaining. Some locations, like Bangkok, Phuket, and Chiang Mai, may accept applications with up to 45 days left. However, other places, such as Pattaya and Koh Samui, recommend applying just within the last week before expiration. It's advisable to check the specific policies of the immigration office you plan to visit.