Sutter County Agriculture Commissioner Mark Quisenberry says farmers are reporting losses in walnuts, canning tomatoes, peaches, pears and prunes. The county's prune crop, California's largest, was hit hardest.
In neighboring Yuba County, prune orchards lost between 10 percent and 100 percent of their fruit. Pear farmers reported 30 percent of their fruit destroyed.
It may take longer to determine the damage to walnuts. Yuba and Sutter counties produce California's fourth-largest walnut crop.
The full extent of crop losses won't be known until harvests begin this summer.