Foreign Nationals Driving in the United States
People who drive in the U.S. must have a valid driver's license. Some states require an International Driving Permit (IDP) from foreign nationals, in addition to a valid license from your own country. Contact the motor vehicle department of each state you will drive in for its requirements.
Out-of-state and foreign driver licenses
You can drive in New York State with a valid driver license from another state or country. You don’t need to apply for a New York State driver license unless you become a New York State resident.
If you have a driver license from another country you do not need to have an International Driving Permit, but it is helpful. The permit verifies in several languages that you have a valid driver license. Police officers who can’t read the language on your foreign driver license will be able to read the permit. Contact the authorities in your home country to get an International Driving Permit.
I would never do it. Just the potential liabilities would be a nightmare, especially in an at-fault collision.
My Niece went through this very thing. Lent the car to her boyfriend, he totalled it 15 min later by rear-ending a transit bus and her insurance had to cover the loss and vehicle replacement cost since he had none of his own. That's a total loss claim on her record now at 20 yo.
https://globalnews.ca/news/4499095/lend-your-car-out-icbc-fee/
Wonder this going to make its way to ontario