John Muir was born in Dunbar, Scotland, to Daniel Muir and Ann Gilrye. His early life was steeped in strict religious upbringing and rigorous outdoor work on his family's farm. This early exposure to nature, even under demanding circumstances, fostered a deep appreciation for the natural world that would later define his life's work.

The Muir family emigrated to the United States, settling on a farm near Portage, Wisconsin. This move exposed the young Muir to the vast, untouched landscapes of the American frontier, further igniting his love for the wilderness. He quickly adapted to farm life and invented numerous labor-saving devices, showcasing his ingenuity and resourcefulness.