It should be.
DON'T QUOTE ME. I don't know the exact limits there either, but most of that area is unincorperated. It should be fairly easy to find maps of city limits around the area, either online or at city hall.
And just make sure what you are doing is safe. The guys with the flashy lights may show up (it's still fairly close to populated areas) but if everything you are doing is safe (ears, eyes, backstop...), likely they will chat for a min then get up and leave.