Sledin,
Being in Manitoba, you will have a very short season. You will have to have your hives at full strength at the beginning of the flow in order to get a good crop. Then you will have to make sure your hives are ready to survive a long, cold winter.
We used to have a member here, Finski, that was from Finland. He produced over 200 pounds of honey per hive per year with a similar season.
Jim