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How did California Indigenous peoples use acorns as a food source?

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A dancer in a bright pink shawl with fringe, wearing traditional regalia adorned with blue and black accents, performs at an outdoor cultural event. — Native American November is the traditional time of harvest, gathering, and celebration in Native communities.

For Indigenous peoples in California, acorns served as a vital food staple, providing a reliable and abundant source of nutrition. Because raw acorns contain high levels of tannic acid, these groups developed specialized processing techniques to make them edible.123

The preparation process primarily involved grinding the acorns into a pulp or flour. To remove the bitter toxins, the pulp underwent a leaching process, which was essential for rendering the food safe for consumption. Once processed, the acorn flour could be used in various ways to sustain the population.13

Many groups, such as the Miwok, stored their acorn harvests in specialized basketlike granaries to ensure a consistent food supply throughout the year. This reliance on gathering and processing wild plant foods, alongside hunting and fishing, allowed many California Indigenous cultures to thrive across the region's diverse microenvironments without the need for centralized agriculture.213