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Varies state by state. In CO the main annoyance is goathead thorns but they're seasonal and come in after summer I think. I got one on a path last autumn and one recently off road. No problems on the road bike all winter and so far in spring. I'm switching to tubeless for some upcoming gravelly rides only.
Just started snowing here. I reckon that'll be the last one this winter. The storm warning sounds nasty and it'll be dumping in the mountains but it's still "warm" spring snow - the roads will be clear tomorrow.
I'm not going tubeless. How bad are USA roads for shrapnel?