From my experience, living most of my life in SFLA, the best time for the most tropical fruits s in SFLA are the hottest months, July to September. During these months you can find Mangos, Abiu, Mamey, Annonas, Jakfruit, Avocados, Dragonfruit and many others. I am sure others in this Forum will find fault with my timeline, but this is the time that Fairchild has chosen for their MangoFest and when the Fruit Conference is held. The reason they choose this time is that it's peak season for many things. Now weather can play a factor in the ripening or availability of things so it's good to check before you book if you are looking for something in particular. My 2 cents!