In an average year, Fukuoka's cherry blossoms reach full bloom around March 31. For a March 11–20 trip, the chance of overlapping peak bloom is ~0%, and the chance of seeing at least some blossoms is ~31%.
Across March 11–20 in an average year, expect roughly 9 days of buds & bare branches. Mostly bare branches with pink-tinged buds — sakura hasn't started here on these dates in most years.
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