I just got back from sampling grapes in 4 different vineyards. Fortunately for us, crush is still 3-4 weeks away. The brix (sugar content) was generally around 18% but needs to be around 26-27. The flavors are getting there but still needs some time. That is fortunate since we are going on a family sailing trip to Catalina the week after Labor Day. I'll sample before we go, see where the grapes are and let you know.
I will be going out on August 17th and 27th to sample grapes from Calaveras County and August 31st from Amador County. I went back through our records and the earliest we picked was the end of August and the latest the end of October. I'll let you know what I find.