I have a Kara Mandarin that has 3 fruits that have just turned orange. (Also green unripe fruits) I have checked many websites including the UCR website and it says that these are supposed to ripen March to June. According to the chart at UCR the rind is still supposed to be green.
What the heck is going on here people! Every morning I go out and want to eat those mandarins, but I don't want to yank them off if they are supposed to stay on and sweeten till March.
http://www.ccpp.ucr.edu/variety/002.html