found this
Q: Can a city, county or political subdivision post signs restricting the
concealed carry of firearms by Licensee's?
A: Yes, HOWEVER, again, cities, counties and other political subdivisions may only post their buildings. Parks, parking lots,
and other open public property is no longer able to be restricted through signage.
source,
http://www.ksag.org/files/shared/conceal.carry.FAQ.pdf