The Thai government is considering easing quarantine requirements and restrictions on travel to Thailand in four phases.

The first phase will begin on 1 April 2021. International visitors to Phuket, Krabi, Phang-nga, Chiang Mai, and Pattaya will be quarantined for only seven days if they have been inoculated against COVID-19 and hold a vaccine certificate.

In the second phase, beginning 1 July, international tourists who have been inoculated will not need to be quarantined while visiting Phuket. Vaccinated tourists visiting Krabi, Phang-nga, Chiang Mai, and Pattaya will still be subject to a seven-day quarantine period.

In the third phase, which begins on 1 October, foreign tourists visiting Phuket, Krabi, Phang-nga, Chiang Mai, and Pattaya who have been inoculated and have a vaccine certificate will not be required to enter quarantine.

In the final phase, starting 1 January 2022, any foreign tourist who has been vaccinated against COVID-19 and holds a vaccine passport will be able to enter Thailand without having to enter quarantine. 

Source: https://thailand.prd.go.th