Whitcomb Cherry
Prunus subhirtella (Higan-zakura) 'Whitcomb'

Blooming: February to March
Blossoms: 5 petals; initially pink, later fading to white
Frequency: relatively rare in Vancouver

The Whitcomb Cherry is related to the Autumn Flowering Cherry and is the earliest spring flowering cherry tree that I am aware of in Vancouver. The first blossoms which are dark pink open as early as late January and full bloom is around middle of March.

(http://www.japan-guide.com/sakura/species.html)