I contacted info@ironstonevineyards.com and received this very detailed reply from the GM. I thought I would pass it along if anyone else was interested.
We advertise 4:30 as the opening time, however, if traffic backs up on Six Mile Road the California Highway Patrol makes us open early. There is always an initial influx of vehicles when we open the gates whether it be earlier than announced or at 4:30. After the initial opening the next “rush” of traffic comes around 6:00 pm. Since we use the entire facility for Independence Day, there is plenty of lawn seating for everyone. Many families go to the lower lawn while others go to the amphitheatre.
Again, while 4:30 is our advertised time to open the gates, if we are ordered to open early due to road congestion we will comply.
Bruce Rohrer
General Manager
Ironstone Vineyards