Dr. Kami Kandola, the NWT chief public health officer, has suspended the exemption from self-isolation for travellers from the Yukon.
The decision comes as an outbreak in Whitehorse continues to grow.
As of Monday, there were 21 active cases of COVID-19 in the city. The territory also reported its third death related to the virus.
Anyone coming into the NWT will need to self-isolate. Fully vaccinated individuals may be eligible for a shortened isolation.
According to a news release, individuals who recently came into the NWT from the Yukon will be contacted by the office of the chief public health officer with “individualized advice” on the next steps.