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14-50 charging at the Buena Vista, CO KOA last winter during a cold spell. It was -8˚F., -22˚C. that evening. That's Mt. Princeton, a 14er, in the background. Notice the tracks of my snow tires in the snow and the snow that accumulated on the rear of the car. There is a license plate on the car!
Winter boots, ski pants, jacket, hat, and gloves were my range extenders that day. I put just enough ventilation and heat to the windshield defroster to keep my breath from frosting up the inside of the windshield. The car still consumed extra energy vs a more moderate temperature trip; I assume to keep the battery warm. This led to an approximate, additional 30 miles of charging (about an hour) at the KOA on a 300 mile trip.
The KOA was closed for winter, but answered my phone call, wanted to see a Tesla, and were happy to let me charge. I made a donation to their KOA Kamp for Kids charity.