Do green card holders need visa for canada?

This is from Canada website: As a U.S. Green Card holder, you do not need a visitor visa to travel to Canada. However, you are expected to have an eTA if you plan to fly to or transit through Canada. read more

U.S. permanent residents do not need a visa to travel to Canada. However, you will still need valid travel documents (like a green card and passport) to cross the border. The U.S. has a close and extensive relationship with Canada. They share the longest international border in the world. read more

Here's why: Although U.S. green card holders don't need a visa to enter Canada, you do need an electronic travel authorization, or eTA, to enter by air. And to get that eTA you need a passport from your country of origin, which you must also present for verification when you enter the country, along with your green card. read more