How many days before the end of the 60-day Visa Free entry can I apply for an extension in Thailand?

You can typically apply for a visa extension in Thailand when you have 30 days or less remaining on your 60-day Visa Free entry at most immigration offices. In some locations, like Bangkok, Chiang Mai, and Phuket, you might be able to apply with 45 days left. However, specific offices, such as those in Pattaya, Koh Samui, and Koh Phangan, allow applications only during the last week of your visa duration. It's best to check directly with the relevant immigration office for precise requirements.