You can do a seasonal hold for only up to 6 months a year at $15/month, but you will lose your plan and have to pick an in market one when it ends (or you're automatically placed on the cheapest one if you don't change it yourself).
I think the best thing to do is port your # out to a prepaid service which only requires a yearly top up, which most of the other providers do. It'll be $100 upfront but it will keep it active for the whole year. Just take the SIM with you and don't use it. Then port it back to Koodo when you return to Canada.