imported post
It's an interesting question here in Colorado. Within the law itself, there's no exception for something like that, unless you'd otherwise be covered under a defense (e.g., you're OCing while you're hunting, it starts to rain, and you can conceal your gun because you're actively engaged in hunting). Just out and about town, you run into some serious criminal trouble without a CHP.
However, the origin of the unrestricted concealed carry while "traveling" comes from a court precedent dealing with a now defunct Denver law from the turn of the 19th century: they banned carrying concealed weapons, requiring people coming into the city on horseback to openly carry their guns no matter what the conditions were. As you might know, wearing a gun on a dry, dusty day or on a wet, muddy day while you're riding a horse can destroy a gun's finish (or even it's action/springs) in very short order... as such, the court ruled that while Denver had an interest in preventing crime by regulating the use of weapons, a person's right to private property overruled that, so a person riding their horse into the city from the countryside "while traveling" had a greater right to conceal their weapons until they stopped traveling and dismounted in town.
As such, there is a small precedent for taking necessary actions to prevent the destruction of your property under the choice-of-necessary-evils defense. BUT... that is a very tenuous and last-resort sort of thing, since Colorado is a shall-issue state, and it behooves you much more to get your CHP and be able to conceal without having to go before a judge and prove that your gun was going to be destroyed by the weather. It's still interesting, though.