The September 2015 survey period covers Thu. 8/13/2015 - Wed. 9/9/2015.
Publicly released data for subscribing stations age 6+ overall at the links below:

Denver-Boulder, CO: http://ratings.radio-online.com/cgi-bin/rol.exe/arb035

Next report will be for the October 2015 survey period covering Thu. 9/10/2015 - Wed. 10/7/2015.
The data release date is scheduled for Tue. 10/27/2015.