1958, April: Shower of Ice in Napa, California
In the middle of April, 1958, a shower of ice rained down into the yard of Mr. & Mrs. Leo Kozlowski in Napa, California, in the United States. The ice ranged from two to twelve inches in diameter, and many sunk half their length into the ground. There were no planes in the area.
At the moment I have just one source for this account -- Frank Edwards' factually challenged Stranger Than Science (1959) -- so it is marked both as 'needs investigation' and 'unreliable'. I will update this account as I have time!