American Smoketree
Cotinus obovatus
Anacardiaceae · broadleaf deciduous shrub · native
Last updated
Quick Facts
Height
20-30 ft
Spread
26 ft
Growth Rate
Medium
Light
Full Sun
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 4a–8b
Bloom Time
May to June
Fall Color
Orange, purple, red, yellow
Origin
rocky, usually mountain soils from Kentucky
Watch for this season
Root Colonization Period
Powdery MildewModerate
Spring Emergence / Primary Infection
Phenological Calendar
As of May 13, 2026, Puget Sound stations range from 1906.2 to 2098.2 GDD₃₂. American Smoketree typically reaches 'full bloom' at 2450 GDD₃₂, predicted around May 28.
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 13, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,098 | Pre-season | 'Full bloom' | 352 |
| Kent / Auburn | 2,089 | Pre-season | 'Full bloom' | 361 |
| Seattle / UW | 2,063 | Pre-season | 'Full bloom' | 387 |
| Olympia / Tumwater | 2,025 | Pre-season | 'Full bloom' | 425 |
| Tacoma / Puyallup | 1,993 | Pre-season | 'Full bloom' | 457 |
| Bellingham / Whatcom | 1,972 | Pre-season | 'Full bloom' | 478 |
| Sequim / Rain Shadow | 1,906 | Pre-season | 'Full bloom' | 544 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ 'Full bloom' BBCH '65' NEXT | 2450 | '' est. May 28 (forecast) |
Range: 1737–2006 GDD₃₂
(6yr)
Source: 'Master catalog (UMD), converted GDD50->GDD32 via Kent bloom-date mapping' About GDD₃₂ →
Season tracker for Kent / Auburn as of May 13, 2026. Predicted dates use 16-day weather forecast through May 29, 2026, then climate normals.
Diseases: Regionally Documented (2)
Data Maturity Baseline Extension data. Expert review underway.