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The University of Minnesota has developed many many hardy plants for our zone 4 climate. Thanks to the U of MN, we have great apples such as 'HoneyCrisp' and a series of Azaleas called 'Northern Lights'. One interesting plant that not many people know about is: Exochorda serratifolia,
common name: Pearlbush 'Northern Pearls'.
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The woody shrub grows to 8-10 feet tall. The flowering is on the top, like a mockorange or lilac. The best time to see it is right now, when you have bud and bloom at the same time. 
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