Grapes are a popular crafting material used in the Chef profession for desert dishes (cakes, cookies and the like). There are a few different locations to gather Grapes, as I discover them they will be added to this page. Keep in mind, like many of the other "rare" materials used in the Chef profession you can only harvest Grapes from specific locations in the game. These "patches" have a cooldown of 24hours meaning that after gathering the goods in this location you will need to wait 24 hours before being able to gather here again.
The closest Waypoint is Ogre Road Waypoint. From there you will want to run south until you reach the Grape gathering grounds.
Southeastern Lornar's Pass by Greybeard's Landing.