Craig Lebeau and his team are pushed to the breaking point after a serious accident with a fully loaded logging truck traps their lead driver. With mud on the mountain– the worst it has been in years – the accident forces everyone to re-examine whether having the most dangerous job in Canada is worth it.

When Craig's little brother Brent cuts corners to get extra wood off the mountain, a mistake shuts the entire operation down; with the business hanging in the balance, Craig needs to decide if he can bail Brent out.

Craig's newest driver must prove himself on Mud Mountain; facing ice, muck and massive pressure, Theron tries to stay ahead of the fleet, only to be stopped by someone else's mistake.

Things go south when Craig's brother Brent borrows a logging machine, leading to a risky mountainside recovery; veteran log hauler Dan Millar battles rough roads and torn up tires to make it to the mill.

Trouble on the traction line leaves Craig frust endless breakdowns; a driver fights a chronic back injury to keep the trucks moving and a log hauler goes off the road forcing an all-night rescue.

An early spring thaw turns a road building project on a mountain cutblock into a muddy battle for Brent and Taylor; Craig locks horns with his son-in-law over a mechanical breakdown; the boss receives a call that could jeopardize his entire operation.

With the last mill shutting down, Craig shifts into overdrive; the late season push hits hard on the crew and the equipment; as breakdowns add up, star driver Taylor hits his breaking point, forcing a stand-off with the boss.

The LeBeau brothers' fleet battles muddy, sinking roads to get the last logs down the mountain before spring break up sends them all home; on a steep cutblock, Craig rolls a buncher for the first time, sending his crew scrambling to get him out of the smoky machine.