Mortis...
It may just be old wives tales... but we almost always have a frost when red buds are blooming, then when dogwoods are blooming, then often again when black berries are blooming.
We call them winters... red bud winter, dogwood winter and blackberry winter.
It does not always frost when blackberries are blooming but there is almost always a cold spell.
In the county I live in our average annual last frost date is April 21.
You must be quite a bit more north than me.
Below is what my 10 day is looking like now. Nice Garden weather for sure !
TNhunter