Here are some ESTIMATED starting and ending pack dates for most frozen berries and fruits sold by Imperial.  Bear in mind these are just estimates and can always be affected by Mother Nature.  (Fresh seasons differ from frozen.  This chart indicates dates for the best freezing quality berries and fruits.)
Apples All VARIETIES Sept 15 to Dec 31
Blackberries  EVERGREEN Aug 01 to Oct 01
Blackberries MARION  June 15 to Aug 15
Blueberries CULTIVATED  July 15 to Sept 30
Blueberries WILD Aug 30 to Oct 30
Boysenberries OREGON June 30 to July 31
Cherries  RTP July 15 to Aug 31
Loganberries OREGON July 01 to Aug 01
Peaches FREESTONE   July 01 to Oct 15
Strawberries CALIFORNIA  May 01 to Oct 15
Strawberries NORTHWEST June 01 to July 15
Strawberries MEXICAN Jan. 01 to June 01
Raspberries RED  June 15 to Aug 01
Raspberries BLACK June 30 to July 31
Rhubarb CRIMSON RED April 01 to Aug 01