Ash
Sorbaria sorbifolia
Rosaceae · broadleaf deciduous shrub · introduced
Last updated
Data Coverage 4 of 6 dimensions
As of March 31, 2026, Kent / Auburn has accumulated 1062.5 GDD₃₂. Ash typically reaches 'first bloom' at 3276 GDD₃₂, predicted around Jul 1.
Quick Facts
Height
6 ft
Spread
9 ft
Growth Rate
Fast
Light
Sun to Part Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 2a–7b
Bloom Time
June to July
Phenological Calendar
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Mar 31, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,132 | Pre-season | 'First bloom' | 2,144 |
| Seattle / UW | 1,126 | Pre-season | 'First bloom' | 2,150 |
| Kent / Auburn | 1,063 | Pre-season | 'First bloom' | 2,214 |
| Olympia / Tumwater | 1,062 | Pre-season | 'First bloom' | 2,214 |
| Bellingham / Whatcom | 1,053 | Pre-season | 'First bloom' | 2,223 |
| Tacoma / Puyallup | 1,030 | Pre-season | 'First bloom' | 2,246 |
| Sequim / Rain Shadow | 1,023 | Pre-season | 'First bloom' | 2,253 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ 'First bloom' BBCH '61' NEXT | 3276 | '' est. Jul 1 (avg) |
Range: 2515–2896 GDD₃₂
(6yr)
GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? Hover over GDD values for source details. Season tracker for Kent / Auburn as of Mar 31, 2026. Predicted dates use 16-day weather forecast through Apr 16, 2026, then climate normals.
Cultivars (2)
''Bococot'' Cherry On Top™
Cherry On Top™ Sorbaria, Cherry On Top™ Ash Leaf Spiraea
''Sem''
Sem Ash Leaf Spiraea