I might be moving to San Jose / San Francisco in a few months (still completely up in the air). If I wanted to buy 10 acres of land where I can grow food, is there anyplace in particular I should be looking within 100 miles of the area? Or is all the arable land out there a million bucks an acre?
Millman
A place to live and place to grow food need not be in same location. You could get a small place in town and rent/lease a tract within bicycle range or easy drive.

With  small pieces of  ag land stranded by zoning you may wind up with a much shorter commute - good idea in these times. Up here in Western Wash ag land leases for  about $350/acre/year.

Be sure to inquire about water rights.

Hmmm...sounds kinda like a Russian Dacha setup.
MillMan,

A 5 acre plot in Pescadero (a charming peak oil ready village about 1 mile from the beach and surrounded by farmland and redwoods) on Pescadero Creek in rural San Mateo county is about US$300,000.  I was going to relocate my home from San Jose to Pescadero last year.  Then I realized that it would be more prudent to leave the US entirely.

PS:  Strongly advise not living in San Francisco itself.  The SF Bay military bases were gradually closed over the past several years.  Then Jeb Bush was heard to joke at a Florida GOP meeting that San Franciscans were an endangered species.  Make of that what you will.  But Livermore Lab has taken delivery of vehicles with gatling guns, and Camp Parks has been refurbished as an emergency detention centre, presumably for unruly San Franciscans.

Where did you end up moving to?

Right now I rent, I am probably a few years away from owning anything. I am unwilling to buy anything in this surreal real estate market anyway.

Smart.
That's rather scary. Do you think that SF is where the next AlQaeda 'spectacular' will take place?
MillMan - you're off by an order of magnitude, man! $10 million an acre should set you up nicely. Don't forget to budget for watch towers and snipers and ammo for when things get bad and ppl are willing to die trying to get your cucumbers, or anything, to eat. .........