The judge issued the preliminary injunction sought by Lion's Den Adult Superstore in Abilene, Kan., on Friday after hearing arguments on Thursday.
Lion's Den has been trying to overturn the state law, which would become effective July 1 and require the company to remove outdoor advertising within a mile of a state highway.
Representatives at the Kansas attorney general's office called the decision unfortunate and said it would evaluate its options. The attorney general was sued in federal court by the parent company of Lions Den on grounds that the law violated the 1st Amendment.
The store's attorney, Richard Bryant, was unavailable when XBIZ called his office.