Can I extend my spouse visa more than 30 days before its expiration in Thailand?

You can generally apply for a visa extension 30 days prior to its expiration. However, some immigration offices may accept applications up to 45 days before the due date. It's advisable to check with your local immigration office for their specific policies, as practices may vary. Additionally, some offices may require you to consult with them ahead of time to check your documents before your extension appointment.