When should I apply for my marriage visa extension in Thailand?

To extend your marriage visa, you can apply during the 30-day period before your current visa expires, making May 7 the earliest date. It's advisable not to wait until the last day to ensure you have all necessary documentation. In some cases, especially if your marriage occurred years ago, you might need an updated Kor Ror 2 document from an amphur. Be aware that you cannot apply for a new extension if you currently have an extension application under consideration.