Free Canada Parks Discovery Pass timeline
I ordered my Discovery Pass from Parks Canada on December 8, 2016 and it arrived today. Just a timeline for those who have ordered one 6 week turnaround
Forum Discussion
As I understand it, if you don't get the free pass beforehand, you need to get one at the park entrance (of the first park you visit). Ordering it ahead of time speeds things up at the park. I don't know this from personal experience, though.
