The history of Grimsby dates back to the late 18th century, when these lands became a sanctuary for United Empire Loyalists following the American Revolution. The first settlers arrived here around 1787. Initially, the settlement was known as The Forty, as it was located exactly 40 miles from the Niagara River, but the town later received its current name in honor of the English fishing town of Grimsby.
The transformation of a small settlement into a prosperous town was driven by a successful combination of geographical and economic factors. Its location on the banks of Forty Mile Creek allowed for the construction of water mills, which became the basis of early industry, while its position between Lake Ontario and the Niagara Escarpment created a unique microclimate. Colonel Robert Nelles made a significant contribution to the area's development, building his manor here and fostering the region's political and commercial growth by supplying provisions for British forces.
Thanks to the mild climate, Grimsby began to emerge as Canada’s fruit-growing center as early as the beginning of the 19th century, with peach, cherry, and apple orchards flourishing here. A major cultural milestone was the creation of Grimsby Park in 1859. Originally a site for Methodist camp meetings, it evolved over time into a popular summer resort featuring unique "gingerbread" style cottages that attracted tourists from all over North America.