Pine Grove is a neighbourhood[citation needed] of Vaughan, Ontario, Canada, in York Region.

The lands located on the east half of lots 9, 10 and 11 of concession 7 were first patented to David Thompson on May 20, 1801.

By the time of Confederation, Pine Grove was home to a flour mill, churches, three hotels, a blacksmith shop, harness shops, a spool factory, one common school and a large general store with a post office.

Freshly graduated from the University of Toronto, Engineering, he took the advice of his father in the middle of the Depression and "got in the food business".

Harold's son, John Hayhoe joined the company in 1964, one year after graduating from the University of Western Ontario with an MBA.

John Hayhoe, after a battle with Parkinson's disease died on June 20, 2007; the same day the transition of the mill to the new owners was complete.