There’s a stone fruit farm just off 101 near Morgan Hill – Andy’s Orchard, where they grow heirloom varieties of stone fruit and actually pick them ripe. We stop whenever we’re going that way in summertime – better fruit than at most farmer’s markets. The land is surrounded by housing developments and the farm is shrinking, though. https://andysorchard.com/
Andy Mariani also has a stand at the Wednesday Santa Monica market along with David Karp (summertime only) – I haven’t been, but from what I gather, they have the best of the best there.