I would say for a personal grow, as long as you don't tell anyone, you can do it anywhere safely (barring electrical hazards). It looks like you're in the U.S, though. Here's a link to NORML's state-by-state ganja laws.

http://www.norml.org/index.cfm?Group_ID=4516

I'm biased, but I vouch for California and all its Prop 215, Senate Bill 420, A.C.L.U. lawyers-by-the-dozens leniency. I say that not having had any run-ins with the fuzz, though.

Oh wait, I think Spanish is now the official language of California...so nevermind.