When can I extend my 60-day visa exemption for an additional 30 days in Chiang Mai?

If you are on a 60-day visa exemption in Chiang Mai, you can apply to extend it for an additional 30 days at the immigration office. You should do this when you have 45 days remaining on your exemption. It is recommended to visit the immigration office at least a week before the expiration date to ensure you have ample time for processing. Make sure to have a TM30 form if you are staying at a hotel, as this is required for your registration.