California grows nearly half of all vegetables and more than three-quarters of all fruits and nuts produced in the United States. The state operates roughly 62,100 farms across 23.6 million acres of farmland, and its agricultural sector generated $310.8 billion in sales in 2024. No other state comes close to matching that output.
California’s Share of the US Food Supply
The numbers are striking even in broad strokes. About 50 percent of the country’s vegetables come from California, along with over 75 percent of its fruits and nuts. The state is also the nation’s largest agricultural exporter, shipping $24.3 billion worth of agricultural products to international markets in 2023 alone, with Mexico, Canada, and China as the top destinations.
This dominance means that disruptions to California farming, whether from drought, wildfire, or policy changes, ripple through grocery stores nationwide. If you buy almonds, strawberries, lettuce, grapes, or walnuts in the US, the odds are overwhelming that they were grown in California.
The San Joaquin Valley Powers the State
More than half of California’s agricultural output comes from a single region: the San Joaquin Valley, the broad stretch of flat, fertile land running through the center of the state. Valley farms produce more than $24 billion in crop revenues, led by orchards and vineyards (nearly $20 billion) and vegetables ($2.8 billion). Dairy and beef operations add another $9.6 billion combined. Farming and related industries account for 14 percent of the valley’s GDP and 17 percent of its employment, making agriculture the economic backbone of the region in a way that’s true almost nowhere else in the country.
Around 340,000 people work directly in valley agriculture. When you expand that to the entire state and include processing, distribution, and support services, California’s agricultural sector supports more than 1.2 million jobs and 75,500 businesses.
Almonds: A Case Study in Scale
California’s almond industry illustrates just how concentrated US produce can be. The 2025 forecast projects 3.0 billion pounds of almonds from California orchards, a 10 percent increase over the previous year’s 2.73 billion pounds. The Nonpareil variety alone accounts for 40 percent of that total, at 1.2 billion pounds. Virtually all commercially sold almonds in the United States are California-grown, and the state is the world’s largest producer by a wide margin.
Almonds are far from the only crop where California holds a near-monopoly. The state produces the vast majority of US-grown artichokes, dates, figs, kiwifruit, olives, pistachios, prunes, raisins, and walnuts. For many of these crops, California’s share of domestic production is above 95 percent.
Dairy and Livestock Add Billions More
Produce gets the headlines, but California is also a major player in animal agriculture. The state’s dairy operations produced over 10.2 billion pounds of milk in just the third quarter of 2025 alone. Dairy consistently ranks among California’s most valuable agricultural commodities, and the San Joaquin Valley’s dairy industry generates roughly $6.4 billion in annual revenue by itself.
Water: The Limiting Factor
All of this production depends on water, and California’s agricultural sector uses a lot of it. Farming accounts for roughly 40 percent of the state’s total water use when you include environmental flows, or about 80 percent of all developed water (the water that’s actively controlled and managed for human purposes). That’s an enormous share, and it places agriculture at the center of every water policy debate in the state.
Even small improvements in irrigation efficiency matter at this scale. California farmers have increasingly adopted drip irrigation, soil moisture sensors, and other precision techniques to stretch water supplies further. But the fundamental tension between a water-scarce climate and the country’s most productive farmland isn’t going away, particularly as drought cycles intensify.
What This Means for Your Grocery Cart
California’s agricultural output is so large that comparing it to other states undersells the point. It’s more useful to think of California farming as comparable to entire countries. The sector’s $310.8 billion in sales and 1.2 million jobs help underpin California’s status as the world’s fourth-largest economy. When UC Agriculture and Natural Resources researchers tallied the full economic footprint, including natural resource industries, the numbers climbed to $404 billion in sales and nearly 1.5 million jobs.
For consumers, the practical takeaway is straightforward: California grows a disproportionate share of the fresh fruits, vegetables, and nuts sold in American stores. The state’s Central Valley, Mediterranean climate, and massive irrigation infrastructure combine to create growing conditions that can’t easily be replicated elsewhere in the country. That concentration is both a strength, giving consumers year-round access to affordable produce, and a vulnerability, tying a huge portion of the national food supply to one state’s weather, water, and labor conditions.