Red Buckeye
'Full bloom'Aesculus pavia
Sapindaceae, Hippocastanaceae · broadleaf deciduous shrub · native
Last updated
Quick Facts
Height
10-20 ft
Spread
9 ft
Growth Rate
Fast
Light
Full Sun to Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 5a–8b
Bloom Time
April to May
Fall Color
Red
Origin
extends from Virginia to Florida and east to Louisiana and
Watch for this season
Powdery MildewModerate
Spring Emergence / Primary Infection
Phenological Calendar
As of May 13, 2026, Puget Sound stations range from 1906.2 to 2098.2 GDD₃₂. Red Buckeye has passed 'full bloom' (1229 GDD₃₂).
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 | 'Full bloom' | — | — |
| Kent / Auburn | 2,089 | 'Full bloom' | — | — |
| Seattle / UW | 2,063 | 'Full bloom' | — | — |
| Olympia / Tumwater | 2,025 | 'Full bloom' | — | — |
| Tacoma / Puyallup | 1,993 | 'Full bloom' | — | — |
| Bellingham / Whatcom | 1,972 | 'Full bloom' | — | — |
| Sequim / Rain Shadow | 1,906 | 'Full bloom' | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'First bloom' BBCH '61' | 973 | '' |
| ● 'Full bloom' BBCH '65' NOW | 1229 | '' |
Range: 728–874 GDD₃₂
(6yr)
Source: 'Master catalog (OSU, 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)
Cultivars (1)
'Humilis'
Common name: Dwarf Red Buckeye; Mature height: 15 ft
Data Maturity Structured Multiple sources. Expert review underway.