I find a map of the Initial Air Attack zones/freqs here http://wiki.radioreference.com/images/4/43/2012InitialAttack.png dated 2012. I've looked around for a few hours on the Internet trying to find an updated map. Is there such a thing?
Thanks. Exactly what I've been looking for. I tried.Here is one from an Interagency Dispatch Area Briefing Packet dated 2018 showing the same initial attack aircraft communication zones for Colorado on page 15:
https://gacc.nifc.gov/rmcc/dispatch_centers/r2mtc/dispatch/Dispatch_folder/MTC Area Briefing Packet.pdf
If you search with the proper terms on Google,, you will find a number of up-to-date County / USFS plans with the 2018 channel assignments. I do not redistribute information that I find nor do I pass along the links. If you are interested in particular counties and their assigned air tactical channels, you should include the county name, air tactics and channel among your search terms. Once you find the documents, do not overlook the appendices. About one out of five documents located will have the data for some/area/wide-area assignments. Patience is required.