In an average year, Kochi's cherry blossoms reach full bloom around March 30. For an April 1–10 trip, the chance of overlapping peak bloom is ~85%, and the chance of seeing at least some blossoms is ~86%.
Across April 1–10 in an average year, expect roughly 4.5 days of green hazakura (leaves), and 2 days of petal fall / sakura snow. 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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