How soon before my 60-day eVisa expires can I apply for a 30-day extension in Thailand?

The timeframe for applying for a 30-day extension on a 60-day eVisa in Thailand depends on the immigration office you are visiting. Generally, you can apply for an extension 30 days before your visa is set to expire. However, some offices, particularly in Bangkok, Phuket, and Chiang Mai, allow applications up to 45 days prior to expiry. Other locations, like Jomtien and Koh Samui, may only permit applications within the last week before expiration. It's advisable to check the specific policy of the immigration office you plan to visit.