Alex drives on the Arctic Ocean, to the northernmost Canadian village accessible by ice road. Hugh and Rick face melting ice in a desperate search for missing trailers. In Alaska, a massive oil rig move continues as Jack struggles to mentor impatient young driver, Austin Wheeler. And, it's judgment day for the Dalton rookies as both Darrell and Porkchop meet with the boss to see if they pass their training runs.

The biggest storm of the season hits the Haul Road. A trailer malfunction leaves Jack Jessee in danger of getting stranded as the brutal weather closes in. Darrell tries to push through the blinding whiteout, and Porkchop visits the boss to answer for career-ending mistakes. Eager rookie Austin Wheeler is free of former mentor Jack Jessee, but in the brutal winter conditions, his impatient actions threaten to shut down the haul road. In Manitoba, Canada, Hugh and Rick take on their second load of the season, transporting vital water tanks to the remote community of St. Theresa Point. But getting to the remote village means crossing a newly opened section of the winter roads, and taking their heavy loads across untested ice.