In colorado, the cops won't bother pulling you over if you don't have a front plate... the meter maids in Denver will nail you every time... so as long as you park in a private lot in Denver, you're safe!
I'm gonna specify when I order mine that the front plate isn't mounted... and I'll toss it in the trunk, as well as the plate bracket.. then if I get penalized for it, I can say, "Officer, the dealer never put it on... I've got the plate and bracket in the trunk, and I'd be more than happy to get it mounted, I've just not had the time to get to the dealership..."