In an average year, Yokohama's cherry blossoms reach full bloom around April 1. For an April 1–10 trip, the chance of overlapping peak bloom is ~90%, and the chance of seeing at least some blossoms is ~93%.
Across April 1–10 in an average year, expect roughly 3.5 days of green hazakura (leaves), and 2.5 days of full bloom. Fresh green leaves, blossoms finished. If this is your window, late-blooming yaezakura (up to ~2 weeks after) or heading north are your best moves.
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