There is a big grey area when it comes to open carry on your own property. Strictly speaking, it's legal. The problem pops up when you throw in laws for public nuisance, public disturbance, and intentional creation of fear, etc., all of which are highly subjective and usually brought about by hysterical do-gooder types or perpetually whiney neighbors.
I'm lucky, two of my neighbors have told me they would rather I DID carry. Said it made them feel better that the neighborhood was being watched after. The new-age feng shuei'd crystal-wearing broccoli sniffers across the street, however, are not quite so thrilled. If they see me carrying my gun cases out for a day at the range, they gather up the chil'rens and scurry inside until I am good and gone. It's pretty common to see them peeking out the blinds at my while I am standing in the garage enjoying a smoke and a beer.
Brad