Terra - what a score - a free redbud!
I'm always curious how those redbuds do that are planted out in full sun. Waaay back when I was learning what to grow in all of my shade, redbud was recommended as an understory tree. I've seen tons of self-sown redbuds in bloom on the rock bluffs along I65 in KY and am amazed. Obviously, they can make do with some adverse conditions. I will say that my Arbor Day stick (which has to be at least 15 years old) has never bloomed. Maybe too much shade. My other tree gets a little more dappled sun (hardly any) but none get fertilized even via commercial pelletized chicken manure that we feed to our lawn.
Sandy - the UP stays colder much longer. That might have something to do with a tree that is originally late to leaf out.