I guess there's a piece of this that involves legality. I 100% believe you could exist in PA on 100% wild food, but that's not to imply that it's always easy or legal. There's a bit of a give and take between something like Appalachia and Alaska. Appalachia is the more biodiverse part of the States, but Alaska is less developed and far more wild.
From a purely ecological-biological standpoint, cold weather is less of a restriction here. We have longer growing seasons and a greater diversity of flora and fauna related to it. Warmer temperatures also requires less energy expenditure which can mean less intake. But you can mitigate that as well with the fact that a lot of what is hunted and fished in Alaska can provide a much higher percentage of fat and therefore a greater yield even if it implies more intensive technique and/or greater risk.
It's just never going to be a yes/no kind of question and a lot of variables are hinged on legality.
Which raises another question that goes through my head often: what are the benefits of having land legally labelled as farmland? Red tagged farms can hunt deer legally year round. No doubt the economics and politics behind this are fucked, but that's just one thing. It seems that you can have greater permissibility in terms of "fallow fields", simpler regulations of "no spray" areas, cheaper taxes if there are permanent structures on the land (seemingly a requirement if children are living there), and on from there.
I suspect that's a far more technical conversation and definitely a tangent to this, but I'm thinking out loud.