Check out this graph from Arizona department of health 'Hospital COVID-like & Influenza-like illness Surveillance.'
https://www.azdhs.gov/preparedness/epidemiology-disease-cont...
Maybe it's spurious correlation, but I'd bet money the May 25th memorial day weekend had something to do with that big spike you see ramping up May 31. Memorial day also happened to feature thousands of people from another state flooding into Lake Havasu and other, similar cities without mask restrictions, and visiting bars, restaurants, etc.
Bear in mind, there were no mask restrictions in AZ before that peak.
Nobody has an RCT, so we're all just whiteboarding it to some extent.