Paso Robles Climate & Grape Growing
The Role of Different Climates on Paso Robles Grape Growing
Over 75% of the planted vineyards in Paso Robles are Cabernet Sauvignon, Merlot, Chardonnay, Zinfandel, and various Rhone varietals. However, different microclimates allow for success with many other grapes.
Eastern parts of the AVA have a relatively dry, inland climate with hot days and cool nights. It is not uncommon for temperatures to fluctuate by 40 degree from day to night. There are usually several summer days over 100 degrees and temperatures can plunge into the 20s during winter nights. These warm, day time temperatures are suited to growing Zinfandel, Cabernet Sauvignon, and Syrah.
Some vineyards are situated near western canyons that funnel in cool breezes from the Pacific Ocean. An example is the Pinot Noir and Chardonnay vines grown near the cool Templeton Gap. While days are generally clear and sunny, a heavy marine layer often invades after the sun goes down.
Rainfall is sporadic and ranges from 8 to 45 inches per year depending on the microclimate. The east is much drier than the west.
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