Two weather forecast companies issues Cherry Blossom Blooming forecast across Japan.
Weathernews expects Cherry trees in Hirosaki castle Park will bloom on 20th April at present.
https://weathernews.jp/s/topics/201801/170085/ (Japanese site only)
Tenki.jp expects cherry trees in Aomori city is located next to Hirosaki will bloom on 20th April at present.
We guess cherry trees in Hirosaki castle park will bloom about 2 days earlier than Aomori.
https://tenki.jp/sakura/expectation/ (Japanese site only)
Full bloom of cherry trees in Hirosaki castle park is expected in late April at present.
Full bloom of The cherry lined road of Mt.Iwaki is expected in early May.
The following images was taken last year.
The tours for available in cherry blossoms period in Hirosaki