UCR shows Pixie Mandarin season as being Nov-Jan at Riverside.
http://www.citrusvariety.ucr.edu/citrus/pixie.html
The text says "Pixie matures in late winter and holds exceptionally late on the tree; in certain mild locations, the fruit is known to hold well into summer. " which doesn't match Nov -Jan.
Two growers in inland CA areas show season as Feb-April. Does that sound correct?