I'd echo the last post.
While there aren't a lot of us with experience driving a Bolt in the winter, there are a lot of with experience driving Leafs, Teslas, etc, in the winter. This will be my second winter driving my 28 kWh EV, and the drop in range is dramatic the colder it gets. No EV's range is immune to the cold.
Another member on this board suggests the worst case, cold-temperature range scenario is taking the EPA rating and dividing by half, and from my experience - it correlates with my experience. Here's a chart that's been posted a few times that illustrates how a Nissan Leaf is affected by the cold:
It stands to reason that the Bolt's range curve would be similarly affected by the cold. Let us know how it goes with your car.