Freeze fruit that is at its peak ripeness. Fruit like raspberries and cherries will be best just after harvesting, while peaches and plums might need to ripen before freezing. Also, only prepare enough fruit for a few containers at a time if the fruit is prone to browning.
Wash and dry the fruit thoroughly. Remove and discard any pieces that are green or rotting. Remove cores, pits and stones as necessary. Cut to desired size, if necessary, according to intended use.