Sonoma County 2009 Vintage Report
For much of the season, 2009 looked destined for greatness in Sonoma County, until the elements conspired against it in the final weeks.
The cycle began with a harmonious flowering period. Warm days (avg 18°C) allowed for an even fruit set, establishing the potential for a generous crop.
Summer turned up the intensity. With 12 days soaring above 35°C, the vines faced a stress test. Combined with a lack of rainfall (only 150mm total), this led to hydric stress that halted ripening in younger vines, though old vines with deep roots persevered. A key factor was the dramatic diurnal shift (14.3°C), ensuring that despite the daytime warmth, acidities remained razor-sharp.
The finale was fraught with tension. A deluge of 81mm during the harvest period forced an expedited picking schedule to mitigate botrytis risks, rewarding those who sorted ruthlessly.
**Style:** Powerful but variable, with the best wines balancing the heat with careful selection.
About Sonoma County
Napa's laid-back neighbor, Sonoma is a vast region of microclimates. It excels in cool-climate Pinot Noir and Chardonnay from the coast, as well as robust Zinfandels and Cabernets from its warmer valleys.
Climatic Blueprint
Growing Degree Days (GDD)
Total Rainfall
Sunshine Hours
Diurnal Shift
Frost Days
Average Temperature
Historical Context (10 Years)
Comparison of growing season heat accumulation vs regional average.
Want to explore vineyards in Sonoma County?
Discover the estates shaping the legacy of this region.
