Good points. 3 or 4 years ago the USDA tweaked the hardiness zones. So now (Des Moines, IA) where I'm at is the same hardiness zone as northern Missouri, northern Kansas, southern Nebraska, etc.
Combine this with 3 years in a row with unusually hot/dry summers, turf-type tall fescue has become the norm at the I-80/I-35 corridor.
Proud subscriber of TURF Magazine. (thanks Ron)