Grenada – Lawful permanent residents of the U.S. with valid Green Card

You need an eTA to visit or transit through Canada by air if you are a lawful permanent resident of the U.S. and have a valid alien registration card (Green Card).
Note:  you will need a passport from your country of nationality to apply for an eTA.

What you need to complete the eTA Form
Instruction for Completing online eTA Form