Spill lists 5 wineries in Rutherford that accept walk-ins without a reservation. Walk-ins are welcome at 5 of them. A typical tasting is $65. The winery itself maintains the facts on one of these pages.
Do I need a reservation to visit wineries in Rutherford?
Not at the wineries on this page, which take walk-ins. Many other Rutherford wineries are appointment-only, so if a specific winery isn't listed here, assume you should book ahead.