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The mountains of North America hide dangers that few dare to face, but in spite of everything, some men have opted for this way of life in the wilderness.

As America expands westward, intrepid explorers and rugged mountain men risk their lives to blaze new trails into the wild frontier.

Eustace and Raleigh battle a polar vortex to get their lumber business back online; Mike braves a bear-infested landscape in search of fresh meat; Morgan and Margaret fly to chase the migrating caribou, hoping to secure enough food for winter; Jason goes underground searching for iron ore; and Tom and Sean bet big on new trapping grounds.

As night descends across the mountains, Mike treks through bear country with fresh meat on his back; Morgan battles dark and dangerous terrain in a last-ditch effort to fill his freezer; Jake's latest lion hunt takes him deep into wolf territory; Tom joins his brother on an all-night rifle build; and Jason journeys further underground in search of raw iron ore.

Jake will do anything to get his injured dog, Lefty, to the vet. Tom and his brother, Jack, are left high and dry when the well on his ranch stops pumping. Morgan takes one last shot at bagging a mountain sheep; Mike has to go back on the hunt after bears pillage his provisions. And Marty makes a shocking revelation.

Kidd and Harry battle time and rough terrain on a backcountry supply run; Jake and his dogs track down a repeat offender; Tom gets back to business in the Yaak; Morgan checks his remote trapline for high-dollar fur; plus Eustace and Raleigh decide to fight back against trespassers.

Jake has a problem lion on his hands and soon discovers it's not alone; Tom and his brother, Jack, break down on the road to the Yaak Valley; Morgan crosses the Great Alaska Range on an emergency supply run; Jason scavenges steel to jumpstart his bladesmith business; and Eustace and Raleigh's outpost cabin build is dealt a hard blow.

Tom and Sean face off against a coyote threat; Eustace and Raleigh enlist some much-needed help building their lookout cabin; Jason takes one final crack at creating Ozark steel; Morgan and Margaret push deep into the backcountry in search of a stream where the fish are jumping; and Kidd and Harry run rapids to secure grazing land for the summer.

Tom turns coyotes into cash; Eustace and Raleigh take to the forge to raise money for roofing materials; Mike scouts Kodiak bears for the spring hunting season; Morgan and Margaret go river fishing; and Kidd and Harry's search for pastureland quickly turns into a pulse-pounding bear chase.

Jake hunts a lion caught stalking a school bus stop; Tom sets out to end his trapping season on a high note; Eustace and Raleigh struggle to put a roof on their outpost cabin; Morgan and Margaret prepare their horses for a critical supply run; and Jason takes on his first ever Ozark steel knife build.

Tom builds an authentic Native American bull boat; Jake goes back on the hunt for the bus stop bandit; Morgan struggles to haul a ton of greenhouse supplies; Eustace and Raleigh tackle a rush order for lumber; also Jason and his son, Kai, journey back underground in search of more iron ore.

Winter is coming to the mountains. Jake's lion hunt ends badly, Tom and Nancy fight the local coyote population, Jason faces off with a problem black bear, Mike fights predators intent on his fish, and Josh Kirk hunts for the larder.

Eustace and Raleigh work an antique saw, Tom takes on a canoe build, Jake's hunting takes him into the mountains, Kidd and Harry race a storm to round up cattle, and Mike takes on a bear to secure his salmon supply for winter.

Tom and Sean battle bitter cold in search of better trapping, Jake hunts the lion that injured his dog, Eustace and Raleigh attempt a bridge repair on Turtle Island, Mary tries forging, and Josh loses a kill to a wolf pack.

Mike's bear scout turns into an alpine goat hunt; Jake brings in the big dogs to settle an old score with a problem lion; Tom and Sean check beaver sets to see if their new trapping grounds will pay off; Jason leans on the family to overcome a looming deadline and a broken hand; and Kidd and Harry run a backcountry gauntlet to deliver a young horse to a remote buyer.

Back in the Ruby Valley, Jake tracks a dangerous mother lion and her young; Tom hand carves a traditional dugout canoe worth thousands; Kidd and Harry go on the offensive against a pack of coyotes that are targeting their cattle; and Eustace and Raleigh track a rogue black bear that's been raiding a neighbor's home.

Jake's latest mountain lion chase leads him straight to an angry bear; Tom and Jack take on a high-dollar commission to build an ancient atlatl; Jason builds a steel trap to keep the area's wild hogs in check; and Kidd transforms a large wooden boat into a remote summer cabin.

Kidd and Harry are sent into a dangerous free fall by a freak ATV accident; Jake goes on ranch patrol to protect newborn calves; Nancy gives Tom the surprise of a lifetime; Josh attempts to wrangle a feral horse; and Jason salvages farming equipment to keep his bladesmithing operation afloat.

Season Finale; On the hunt for gold, Josh hits the jackpot; Tom puts his handmade dugout canoe to the test; Jake makes his last stand against a massive predator; Eustace sees his dream of keeping his new land go up in flames; Kidd and Harry fulfill a lifelong ambition to secure their future in the mountains.

Tom and Nancy face the onset of winter and Jake hunts pronghorn antelope, while Eustace begins teaching new neighbours the mountain man way. Mike heads to sea in search of better hunting grounds, and Martha goes off road.

Martha and Elli face off with a bull moose, Mike gets into uncharted territory on his hunt and Tom works on a re-curve bow. Jake trails a pair of mating mountain lions, while Kidd and Harry try to warm up after a river dunking.

Tom and Nancy create a masterpiece out of a raw wolf hide, while Jake hunts with his young dogs. Eustace continues lessons for his neighbors to put food on the table, Mike heads to Whale Island, and Josh is caught in the ice.

Josh fights predators and a blizzard to protect his herd, Kidd and Harry rescue a stranded pack mule, and Jake responds to a mountain lion attack. Tom and Nancy help open a trading post in the Yaak, and Mike has a close encounter.

Legendary mountain man John Colter survives many brushes with death, but nothing prepares him for what he faces now; after venturing into Blackfeet territory, he is stripped naked and forced to run for his life as warriors give chase.

As Lewis and Clark's expedition treks into the uncharted west, the rivers they follow become too shallow for boats. Now they must find Native Americans willing to trade for horses...or risk spending winter on the wrong side of the Rockies.