Answer: The plants you mention are suitable for your location but the spruce and sumac need more room than a 6-foot-wide hedge. The dwarf lilac would be the best choice you mentioned. The redbud is borderline in your region, usually hardy only to zone 5b and you are in 5a. I encourage people to try borderline plants if they are especially fond of them and can provide a protected location, but yours may be too exposed. Another choice would be a hedge of cedar if road salt is not a problem, perhaps with the redbud or other flowering shrubs in front of it, such as landscape roses.
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