We are back to something like normal early spring weather in Minnesota, which means the temperature may drop below freezing. I have not looked up how low it got last night, but as of 7AM this morning it was 25oF/-3oC.
We have a cherry tree in the front yard. mia_mcdavid set up a garden hose to sprinkle it during the night. The idea was that the running water would keep the blossoms from freezing. It might not have worked, but the results this morning were visually impressive :