Curtilage is typically the area immediately surrounding your home and different jurisdictions have different case law defining what it is. One important aspect of this is that say you have 40 acres and a rural home. A transfer that is perfectly legal on your front porch may be illegal if conducted 100 yds to the West, even though you are still on your own private property.
The Colorado law uses the same language? That probably is Bloomberg at work rather than coincidence. It is a classic problem of centralized government - people who don't even understand what they are trying to regulate writing the laws.