My wife was out and in many times as green card holder never a question of re-entry. Might have to do with how long outside country though. There are restrictions there
The ask:thailand community, consisting of multiple Q/A groups with over 100,000 members, powers this platform. It is not an official government resource. Our members actively contribute to this resource, and while we strive for accuracy, we cannot guarantee its complete reliability. Assistance to travelers is provided as a community service.