“Utah allows unlicensed open carry of a firearm that is at least 2 actions from firing. For example, a semi-auto may have a full mag but the chamber must be empty. Permit holders may open carry as well, but their firearms may be fully loaded.”

http://www.opencarry.org/ut.html
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76-10-505. Carrying loaded firearm in vehicle or on street.
(1) Unless otherwise authorized by law, a person may not carry a loaded firearm:
(a) in or on a vehicle;
(b) on any public street; or
(c) in a posted prohibited area.
(2) A violation of this section is a class B misdemeanor

However permit owners are exempt:

(2) The provisions of Subsections 76-10-504(1)(a), (1)(b), and Section 76-10-505 do not apply to any person to whom a permit to carry a concealed firearm has been issued