Quince
Cydonia oblonga
Rosaceae · broadleaf deciduous tree · introduced
Last updated
Data Coverage 4 of 6 dimensions
Quick Facts
Height
15 ft
Spread
23 ft
Growth Rate
Slow
Light
Full Sun
Soil
Well Drained
Water
Moderate
Hardiness
Zone Zones 5a–8b
Bloom Time
April to May
Origin
Iran and Turkestan
Phenological Calendar
As of April 3, 2026, Puget Sound stations range from 1070 to 1180.6 GDD₃₂. Quince has passed 'flower buds visible' (1072 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 3, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,181 | 'Flower buds visible' | — | — |
| Seattle / UW | 1,171 | 'Flower buds visible' | — | — |
| Kent / Auburn | 1,111 | 'Flower buds visible' | — | — |
| Olympia / Tumwater | 1,106 | 'Flower buds visible' | — | — |
| Bellingham / Whatcom | 1,101 | 'Flower buds visible' | — | — |
| Tacoma / Puyallup | 1,075 | 'Flower buds visible' | — | — |
| Sequim / Rain Shadow | 1,070 | 'Leaf emergence' | 'Flower buds visible' | 2 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'Bud break' BBCH '07' | 912 | '' |
| 'Leaf emergence' BBCH '11' | 912 | '' |
| ● 'Flower buds visible' BBCH '51' NOW | 1072 | '' |
GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? GDD₃₂ thresholds from USA National Phenology Network citizen science observations (WA+OR). Season tracker for Kent / Auburn as of Apr 3, 2026. Predicted dates use 16-day weather forecast through Apr 19, 2026, then climate normals.