The Anti-Defamation League (ADL) published a web-based overview and analysis of White Supremacist Propaganda incidents on campus in the US in 2017-2018. The ADL describes itself as activists, educators and experts, who fight anti-Semitism and all forms of hate.
Their overview shows a 77% increase of incidents from the previous academic year, with 292 cases reported, compared to 165 in 2016-2017. According to the report, white supremacists have been actively targeting U.S. college campuses since January 2016, but the practice failed to gain any real traction until the fall semester of that year. Since then, propaganda efforts have steadily increased.
In their overview, they distinguish between reported incidents and incidents recorded by ADL itself, the latter being 478 since September 2016. The report has a graph showing where these incidents occurred (with a chart of Red and Blue in 2016 for comparison).