A day trip from Portland to Maine wine country is completely doable: 20 minutes to 3 hours gets you to the heart of the action, and a focused itinerary lets you visit 3-4 wineries with a lunch stop and scenic drive.
The Plan: Leave Portland by 9-10 AM. Drive to the closest wine cluster and start at a well-known producer to get oriented. Visit 2 more wineries before lunch at a local restaurant or winery with a kitchen. One final afternoon stop at a scenic estate, then head home by 5-6 PM.
Which Sub-Region: Focus on one sub-region rather than trying to cover the whole state. Pick the corridor closest to Portland and go deep rather than wide. You will see more, taste more, and drive less.
Practical Tips: Designate a driver or book a tour service. Bring a cooler for wine purchases. Eat a solid breakfast before you start tasting. And resist the urge to add one more stop, three great wineries beat five rushed ones every time.