Before all of you from other places get your panties in a wad, this is a map of Idaho showing National Forests and BLM land. County land is legal to hunt, also, and Fish and Game has Wildlife Management areas in addition to these.
Bottom line? You can hunt in a LOT of places. If it's not obviously private (in city limits, developed, cultivated or posted), then it is generally legal to hunt.
A few people have little parcels in the middle of the National Forests, old mining claims and the like. If they want to keep people off these parcels, they post them. Otherwise, there'd be no way of knowing where they even are when you're out in the woods.
That's what I meant by B. I
didn't mean I'd hunt in someone's obviously private land just because I didn't see a sign telling me otherwise.
In Idaho, there's so much public land that landowners know to post their private land outside city limits. If they don't post it, I don't have to carry around plat maps to figure out where their unmarked parcel in the middle of the forest might be.
This isn't Texas, and we are fortunate in that we don't have to own or lease a ranch, to hunt.