In the first episode of Kate Humble: Off the Beaten Track, the presenter and her Welsh sheepdog Teg travel from the most northerly farm on mainland Wales, just outside Llandudno, across to the sleepy hamlet of Nantmor in Snowdonia. Along the way, they experience the comeback of old-style shepherding, learn how canine power is saving lives on the mountains and see a forest through the eyes of a pack of huskies. Kate also takes a naked plunge into a freezing lake to experience the landscape in a very different way. And at the largest shiitake farm in the country, she finds out how to trick mushrooms into fruiting.

In the second episode of Kate Humble: Off the Beaten Track, Kate and her Welsh sheepdog, Teg, travel from southern Snowdonia to one of the least-populated areas in the UK, deep in the Cambrian Mountains. Along the way, Kate experiences a deer cull, loses a herd of cattle on Cadair Idris mountain, meets a family relying on the weather to run their mod cons, tastes the Dyfi Valley from a glass and discovers the Welsh equivalent of the Amazon rainforest.

Kate Humble and her Welsh sheepdog, Teg, continue their journey across the remote Welsh countryside, by exploring mid-Wales. In Ponterwyd, they herd sheep for the market, and Kate witnesses first-hand the price disparities between what farmers get for their sheep and what consumers pay. At the Teifi Pools, she discover that Wales is a world leader in protecting its dark skies. Along the River Elan, Kate gets hooked on fly-fishing and in Llangammarch Wells, Teg has a family reunion, meeting three of her five pups to see if they can earn their Welsh sheepdog credentials.

Kate Humble and her Welsh sheepdog Teg continue their journey across the remote Welsh countryside, by exploring Carmarthenshire. In the Cothi Valley, Kate herds and milks goats. In Capel Iwan, Kate tries her hand at trotting. Then in Cwm Elfed, they meet an Englishman keeping the Welsh weaving tradition alive. Near Carmarthen, they see how beavers are transforming a Welsh farm and in Llansteffan, they take to the water, rowing across the Towy estuary to reach the end of their journey