Ripening of Concord Grapes in California
I like your answer for Oregon, can you help me out for the Sacramento Valley in California?
Sacramento County California
Thank you for your question. Since each state's agricultural university does research on topics relevant to its area(s), your own county Extension office should have information for the Valley. (I have been unable to find any UC Extension articles available on the Internet, on this subject.) Here is the office's webpage, with contact information: https://ucanr.edu/sites/UCCE_Sacramento/