How sakura nyc works

50,000+ trees from the NYC Parks street tree census, plus 441 park trees added manually for places the census doesn't cover well — Roosevelt Island, Central Park Reservoir, Riverside Park Cherry Walk, BBG, Sakura Park, and others. Park coordinates are from OpenStreetMap and park maps, checked against OSM data. Some may still be off.

Growing Degree Days (Chung et al., 2011). Starting February 1, daily warmth above 4.3°C is accumulated. Yoshinos typically hit peak bloom around 221 heat units. Temperature data comes from Open-Meteo.

Different spots bloom at different times. BBG is sheltered and south-facing, so it leads. Riverside Park faces the Hudson and trails. Each location has a microclimate offset applied to the GDD calculation.

7-day temperatures from the National Weather Service, projected forward as GDD to estimate when bloom stages will shift.

Tap a tree on the map to upload a photo. Sightings show up as thumbnails so you can see what's actually blooming.

Six types tracked: Okame (first to bloom), Yoshino, Kwanzan, Higan, Sargent, and Japanese. Use the filter pills to isolate species on the map.