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This year's forecast is already out.It says cherry blossoms will start from Mar 25 onwards, till Apr 8 or so. The peak time may differ in various regions.
Normally the end of Mar to the beggining of Apr. However, actually depends on where you will go. IF you go to Hokkaido, Sakura season will be from the end of Apr to the beggining of May.
I asked last year to Japanese guides. If you want to get real local information, I recommend to you visiting there page:D
https://goo.gl/JFrXJD
Spring is the main season! April and March are the main months! But there are certainly some outliers.
Spring is the main season! April and March are the main months! But there are certainly some outliers.