The ban was set to expire at the end of February, but Transport Canada said "cruise vessels in Canadian waters pose a risk to our health care systems."
Most large cruise ships visiting Alaska are registered in foreign countries.
U.S. federal law prohibits foreign-registered ships from sailing between two American ports without stopping at a foreign port between. Large cruise ships bound for Alaska either begin voyages in Canada or stop there on the way.
Most of Alaska's 1.3 million visitors two years ago were cruise ship passengers visiting southeast Alaska. Many disembarked for excursions in Anchorage, Denali National Park and Fairbanks.
Last year, the pandemic and Canadian restrictions resulted in only 48 cruise ship passengers visiting Southeast Alaska, Juneau-based Rain Coast Data reported.
Juneau City Manager Rorie Watt said he was not surprised by the extended ban, although he thought it might last a few months instead of the entire year,
"Three months ago, we thought we'd see ships in May," Watt said. "A month ago maybe we'd see them in June, two weeks ago maybe we'd see them in July and last week, we thought maybe we'd see them in August."
The order could be rescinded if pandemic conditions improve. But Skagway Mayor Andrew Cremata did not see a possibility for relief for now.
Get breaking news alerts in the FOX 5 NY News app. Download for FREE!
"Any idea that there could be some kind of workaround is off the table now, because the Canadian government has stated very clearly that cruise ships will not even be allowed in Canadian waters," Cremata said.
Watt said Southeast Alaska port communities weathering another year without revenue from cruise ship passengers and related businesses will need help.
"We are going to be hoping and praying for a large federal stimulus package," Watt said.
For most people, the coronavirus causes mild or moderate symptoms, such as fever and cough that clear up in two to three weeks. For some — especially older adults and people with existing health problems — it can cause more severe illness, including pneumonia, and death.