The Columbus Farmer's Market's address is 2919 Route 206, Columbus, New Jersey, and they have their own handy MapQuest widget to help you plan a driving route: Directions & Map
Unfortunately, there is no reliable nearby public transit that I know of currently.
We're located indoors in spot 405, right in the food court. We currently do not operate any outdoor annexes, but hope to within the coming months on Sundays! The indoor market is open from 8 AM - 8 PM on Thursday, 10 AM - 8 PM on Friday, 8 AM - 8 PM on Saturday, and 8 AM - 5 PM on Sunday year round, with extended dates in late December for holiday shopping convenience. We're open through poor weather conditions as long as there isn't a power outage or conditions so hazardous that people are encouraged not to leave their home (or worse, evacuate).