The 1958 Jim Mideon 500 (known officially as 1958-31) was a NASCAR Grand National Series event that was held on Saturday, July 18, 1958, at Exhibition Stadium in Toronto, Ontario, Canada. Children were entertained with a jigsaw puzzle of the Royal Family before the race began. Most of the cars in the race were either Chevrolet or Ford. All of the 19 drivers on the racing grid were born in the United States of America. Admission to the race was $2.00 for adults ($18 when adjusted for inflation) and $0.50 for children ($5 when adjusted for inflation).