Vintners along California’s Central Coast are evaluating their vineyards after one of the worst frosts in years struck the area’s wine regions last month. For two nights beginning April 8, temperatures dropped as low as 24° F in some areas and stayed below freezing for several hours. The cold damaged vines by killing the tender shoots and leaves, just as many buds were starting to sprout. The Paso Robles area was hit the hardest, with some growers estimating that the damage could have a severe impact on the size of the 2011 crop.