ALL VEHICLES WITH REGISTRATIONS INCLUDING TEMPORARY PLATES WILL BE CONSIDERED VALID THROUGH THE STATE OF EMERGENCY. WHEN THE EMERGENCY IS DECLARED OVER, YOU HAVE 30 DAYS FROM THAT DATE TO REGISTER.
No need to re-register (BMV is closed)
No need to register new vehicles bought from dealers.
http://www.mainelegislature.org/legis/bills/bills_129th/billtexts/SP078901.asp
Sec. F-1. Registrations issued by a municipality. This section affects certain registration and licensing performed at the municipal or county level.
1. Vehicles and trailers. Notwithstanding the Maine Revised Statutes, Title 29-A, chapter 5 or any other law or municipal charter provision or ordinance to the contrary, a registration, including a temporary registration, of a vehicle, including, without limitation, a motor vehicle, all-terrain vehicle, watercraft or snowmobile, or a trailer required to be registered in this State that expires during the period of a state of emergency declared by the Governor in accordance with Title 37-B, section 742 due to the outbreak of COVID-19 is deemed extended until 30 days following the termination of the state of emergency.