Which wineries in Howell Mountain have outdoor seating?
Spill lists 8 wineries in Howell Mountain that confirm outdoor seating. Reservations are required at 6 of them. A typical tasting is $75.
Is outdoor seating at Howell Mountain wineries first come, first served?
It depends on the winery. Many seat outdoors by reservation like any other tasting, and a few keep the patio for walk-ins. The winery's page says which, and weather can close a patio on the day.