colleges are not part of the "gun free school zone" if that is what you are asking. So you can certainly go "near" campus (assuming you aren't in a gun free school zone due to grade 1 - 12 school nearby.
I'm not sure about "on" campus.
A private college would be private property, so they have the ability to restrict carry on their property, but not 'near' their property.
A state college, I believe there is an administrative code that prohibits carry on a UW campus, but I don't have it handy to cite. Once again, that would only apply ON campus not "near" campus.