Winter is a tire conversation
Northern Colorado gets real winters, and that changes two things.
All-season tires handle mild winters and struggle in severe ones, because the rubber compound hardens as temperatures drop. Where ice and packed snow are normal rather than occasional, a winter set performs in a way all-seasons cannot. Ask the store what people in this area actually run, which is a more useful answer than a general rule.
For a fleet, the winter question is alignment and inflation rather than tread pattern. Cold air drops pressure, an under-inflated tire runs hot and wears badly, and a unit out of alignment on a wet or icy road is working against itself. Scheduled maintenance before the weather turns is cheaper than the alternative.

