Garry:
times are 10:30 to 4:30 on Saturday and Sunday.
Adults $5, Seniors $4, 5 to 12 $3, under 5 free.
Come west from Hwy 400 along 401 to Hwy 410 and go north. 410 becomes Heart Lake Road at Bovaird Dr. and you go north another 8 km to Brampton Fair Grounds.
(and I spent much of my life thinking that Northern Ontario began at Hwy 7)