I just keep hearing about how California needs all of this migrant farm labor to bring in the harvest from the news so I figured that migrant labor (probably illegal) was still widely used instead of mechanization.
Living in an upper Midwestern state California, comparatively, is a slacker when it comes to food production and with good preservation techniques having good food is easy year round even when it isn't in season. Case in point I have found that by being a cheap guy I have also become mostly a localivore (still hate that stupid term) since it is cheaper to go and buy in bulk from the farmer, and then can, dry, prepare and freeze, pickle, or otherwise preserve the food than to buy as needed at the grocery store. Basically I do the following:
get a few 50 lbs sack of potatoes for $5 each and just keep them in the cool dark basement
Can up 10s of gallons of stews, chiles, sauces, and soups made from meat from farmers I know and stuff out of my garden
make jams, fruit sauces, dried fruit, and preservers from trees on my own property or from local orchards
Make a bunch of meals and just freeze them (lots of home made pasta dishes)
Freeze a bunch of raw food
Buy large sacks of dried beans
If you dedicate a few weekends in the late summer and fall to cooking it is amazing how much food you can make and preserve and then not have to worry about cooking for most of the year.