In Coldfoot, he jokes about load counts with Hugh, who is going north with a light load of pipe fittings left there after the last storm. The explosion sends into Todd's and Derek's faces; to get medical attention, the convoy must backtrack 80 miles to. He passes his trainer from the previous season, who notices part of the load coming loose, and both pull over to secure it. Once he gets to the start of the side road, he stops for the night; the next morning, he negotiates animal and driving hazards until coming to the Jim River. Shortly into the trip, though, he develops the same engine trouble that cut his last run short.
Dave drives on the way back to Fairbanks as Phil offers advice; once they have returned, their boss decides to consider both Phil's and Tony's opinions and figure out what is next for Dave. Nevertheless, he is put back on duty and heads up the Dalton with a load of pipes, since there is still a large volume of cargo to move. One of his batteries shorts out and bursts as he checks its connections. He picks up a shack several feet longer than his trailer and hauls it back to Winnipeg, noting the extent to which the road is melting down. Tim crosses Atigun Pass, now dotted with patches of black ice, and finishes his run to Deadhorse. Pushing on through the bad road conditions and rush of southbound trucks near Atigun, she brings her load safely to Prudhoe.
The next day, having delivered it and returned to Fairbanks, he becomes frustrated and drives off when there are no available loads for him. They reach Prudhoe and Alex, Hugh, Greg, and Ray pick up their Nuiqsut loads, but the bad weather forces everyone to wait 36 hours until they can start off again. Shortly after the start of the run, Tim feels himself losing control of his truck, and he decides to abandon his load and return to Fairbanks so he can have the truck checked out. She eventually arrives as well and the two deliver their cargo. The group crosses a lake with 60 tons of combined vehicle weight, cracking the ice on the far side, and picks up the generator for the return trip. After both reach Prudhoe, Phil calls Lane to deliver his unfavorable opinion.
The flipped truck seen in the previous episode contains a load of , which must be salvaged to prevent damage to the environment; after a six-hour road closure, the truck is towed back to Fairbanks and the load goes to Deadhorse. With Todd's truck fixed, he, Art, and Todd resume their trip to Tadoule Lake. Hugh gives him a pull-start so he can get moving again. The road takes them up the and over parts of the , with long stretches in which drivers are out of radio contact. After being convinced by his wife to keep trying, he attempts to make another run, but the brakes on his trailer lock up. Drivers Alex, Jay, Rick, T. Ray spins out on a hill while hauling a refrigerated van toward Prudhoe.
They have a rare meal together, passing time as best they can, and Jack teaches Lisa how to change out an air filter. Once he is over and down, he and Ray laugh about Greg's mishap; later he gets a flat tire and changes it before finishing the run. That night, word reaches them about the thin lake ice; with no one to help, they have to take their full loads onto the crossing. She takes on a car carrier loaded with pickup trucks, but her convoy partner is unhappy with her slow speed and trades loads with her, much to her dissatisfaction. In Fairbanks, Darrell is cleared to start making solo runs and heads north with a pump motor. They find the two abandoned trailers, but must wait for a loader to arrive and plow away the snow burying the wheels. Joey brings an old Ford big rig out of storage to haul lumber to Lac Brochet, 200 miles away, with Jonathan taking a load of his own.
Though the cab is now full of nausea-inducing diesel fuel evaporation fumes due to the leak, Lisa completes her run to Fairbanks. Part of Jack's load must be delivered to a certain point on the Dalton first, and Ronald is expected to help unload it. Alex gets a speeding ticket while hauling the last load on the Shamattawa contract, hoping to meet the following morning's deadline. In Inuvik, crew foreman Davey Lennie looks after the fleet and responds to a call of a truck that has run into a ditch, digging it out so it can be driven safely back. In Fairbanks, Ronald starts his first solo run up the Dalton carrying a load of sandbags. The incident puts him back in the shop, fuming over this turn of events. With the help of a student trucker, Hugh takes his refurbished vacuum tanker to Aput, a natural gas exploration site, to haul away a load of wastewater.
The road has many weak spots where water flows up onto the ice, and the two break partway through one of them on a slushy stretch. He gives Hugh a ride back to Hugh's truck, then keeps going south alone. Jack and Lisa form a convoy of their own and start for Deadhorse, he with a three-tanker load of diesel fuel, she with some containers and rig mats. Alex successfully gets over the hill on which he stalled out in past runs, but at Coldfoot he finds that one of his tires has gone flat and peeled off its treads. That night, Carey's truck develops engine trouble and he decides to drop the load and return to the shop in Fairbanks, rejecting Austin's offer to pull the load.
The delay in starting out leads Alex and his escort to stop at Coldfoot for the night. He has a close call with a southbound truck before completing the run. Rookie Devon Neff, making his first ice road run, and Hugh are dispatched from Inuvik to help with the job. Rick dents one of his rims on a bumpy stretch; by the time Hugh jury-rigs a repair job, the convoy has lost the whole afternoon. Trucking company owner Kurt Wainman assists by patrolling the area to watch for any other stranded vehicles. Dave's problem with shifting gears on the steep grades leads Tony to decide, at Prudhoe, that he needs at least one more escorted trip before doing runs on his own.
With no spares on hand, he has to keep moving in order to stay on schedule, even though driving on the flat poses great risks even at low speed. Darrell, heading north with a tanker of machine oil, develops alternator trouble when he is 30 miles from Prudhoe. As they hit the storm, Jack's air line becomes clogged with snow and he makes a risky stop to change the filter, starting up again just before his battery completely drains from the cold. Each runs into challenges - snow and fog on Atigun for Alex, sleet and a slick, steep uphill run for Hugh - and makes it to his destination safely. Once they bring their loads in, Todd picks up a gravel truck bound for Winnipeg and the two start back. The crew loses time due to maneuvering problems on the road leading to the Dalton, then again when one truck develops brake trouble.
Finally how they examine and solve the numerous problems they encounter on the road. Just outside town, Rick gets the most expensive load of his season, a million-dollar off-road vehicle that must be taken 30 miles up the road to the 2D natural gas exploration site. In Manitoba, Hugh, Rick and Vlad are hauling loads of cement to Pauingassi. The delay puts him one day behind when he heads north again. Eric begins his day driving to Aput, ready to work on the rig move, but he is diverted to pick up a broken-down stuck on the ice; the bulldozer can move slowly but not powerfully enough to do work. He denies the latter, is let off with a warning, and continues to Prudhoe at his usual fast pace.