About the data

Source

All dates on this site come from the phenological observation records of the Japan Meteorological Agency (JMA), published under the Public Data License (Version 1.0). JMA staff observe specific sample trees at weather stations across Japan and record the date each event happens (for example, the day the first five or six flowers open on a cherry tree).

Source: Japan Meteorological Agency website (https://www.data.jma.go.jp/sakura/data/download_ruinenchi.html). This site edits and processes the data; the pages are created by Japan Bloom Calendar, not by the Japan Meteorological Agency.

What each date means

• First bloom: the day five or six flowers open on the sample tree.
• Full bloom: the day about 80% or more of the buds are open.
• Maple / ginkgo color change: the day most of the leaves on the sample tree have turned red or yellow.
• Leaf fall: the day about 80% of the leaves have fallen.
• Typical date: JMA's 1991–2020 normal for that station.

How we process it

• We download JMA's yearly record files and convert them automatically. Numbers on every page are calculated directly from those files by code.
• Records that JMA marks as not for statistical use are excluded.
• Some stations (for example in Okinawa, Amami and parts of Hokkaido) observe a different cherry variety than Somei-yoshino. We mark these cities.
• The cherry blossom "viewing window" is first bloom to about 7 days after full bloom, a common rule of thumb for how long petals stay.
• The trip planner counts, for each of the last 30 years, whether that window overlapped your dates.

Not a forecast

This site shows historical records and averages only. It does not forecast this year's bloom. Actual dates vary by a week or more from year to year and from park to park, even within the same city.

Data last updated: 2026-10-27