I have a bit of personal knowledge with that—not that I have attempted to bring a U.S.-plated vehicle into Canada that we own, given the restrictions.
This is anecdotal because it applies to me. I had discussed this with our own insurance company—Farmers Insurance, in case you are interested—and their conditions would be the same. They would allow the vehicle in Canada and continue to insure the vehicle for, I believe it was six months. There is a different restriction going into Mexico, and I presume farther south, but Canada was fine.