Hi there. As Toller already said the weather is supposed to be good all this week. (Well good if you like the heat which I don't.) LOL And of course it is Calgary though, so if you don't like the weather wait 5 minutes

As for off leash parks there are literally hundreds. Some are small comunity ones and some are huge natural areas.

Calgary Off Leash Areas

If the link works it will take you to the city of Calgary Animal and Bylaw services page. On the right is a link to off leash areas in each quadrant of the city.