Tracking & Predicting Peak Bloom

Blossoms in High Park usually reach peak bloom between late April and early May. As you can see from our Peak Bloom Records below, the date varies year by year as it is a temperature dependent process. In 2016, there was no peak bloom due to unpredictable weather patterns during the winter and early spring.

In 2017, peak bloom occurred on Cherry Hill on April 24. Trees in other locations of the park (along Grenadier Pond and near the Adventure Playground) hit peak bloom 4 days later on April 28.

The blooming period begins when 20% of the cherry blossoms are open and ends when the petals fall. “Peak bloom” starts when at least 70% of the blossoms are open. Once open, flowers last from 4-10 days, depending on the weather conditions. Cool, calm weather can extend the bloom period, while warm, unsettled weather can shorten it. 

cherry blossom bloom 2016

High Park cherry blossoms peak bloom prediction 2017Blossom development is a temperature sensitive process. Warm weather encourages cherry trees to bloom early, while cooler temperatures delay bloom time. It is difficult to predict peak bloom more than 10 days in advance because it is so dependent on weather conditions.Click on chart to the left to see how temperature and bloom dates correspond.

The “Bud to Blossom” Timeline

Predicting peak bloom can be difficult, but as buds start to open you can estimate when the flowers will bloom. Check out the images below for the stages of blossom development.

  • Stage One - Green Colour in Buds: Cherry blossoms emerge before the leaves on the tree. The first sign of their impending arrival are fat, round green buds on the branches of the tree.