When is the best time to apply for a 30-day extension of my visa in Thailand?

One week usually good 🙏

Depends on the requirements and conditions of the particular local Thai Immigration Office where the most recent TM.30 had been submitted for you

Have balls do a border run

I did my 30 day extension 2 weeks before my visa expired but I’ve heard people going in 3 days before and are fine. As long as you do it before your 60 days expires you should be fine

Go to the nearest immigration and ask .that way you'll get the correct answer for that office

We obtained our 30 day extension smoothly from Hua Hin immigration. The end of our first 60 days was the 21st November. We went to immigration on the 10th November.

I think that giving immigration 7 working day prior the end of the first 60 days is reasonable and safe.

If you have to make the application in tight time, make sure the residency proof is in order. I overheard a scene of IM at next counter. She wasn’t happy with the applicant about missing some photo copies of something and also saying “next time should come earlier….”

Went the time , 3to 5 day before. Make sure that the immigration office near where you stay are open. Good luck 🤞🙏

3 PM is the best time to go

1 week is fine.

Most immigration offices allow when you have 30 days or less left.

Some immigration offices allow when you have 45 days or less left.

A couple allow when you have 7 days or less left.

Since you have not indicated what immigration offices, your question is not possible to answer.