Calabogie is a great track as well.
http://www.calabogiemotorsports.com/
From Northeast Region PCA
http://www.porschenet.com/JCMS/content/view/330/140/
July 7-9 Thur/F/Sa Calabogie NER Mar 1 $275 $495 $585
July 11-13 M/Tu/W Mt Tremblant NER Mar 1 $285 $525 $595
Early July in southern Canada can be very hot.