Stink bugs survive well below freezing.
I remember a few years ago filling up and a damn stink bug was on the filler cap. It was in the mid teens. Surely it was dead I thought. Nope, touched it and its legs moved, albeit very slowly.
This winter experienced many more morning lows well below that of last winter. Hopefully that does result in less insects but I doubt it. If my wife gets stung by a wasp it's a death sentence so I have to seek and destroy nests in the spring. Particularly paper wasps and yellow jackets. Fortunately I'm not allergic but their stings, especially getting dozens of them when trying to get away from a ripped up nest on a tractor is not fun.