California’s agricultural output is the largest of any U.S. state, and its highest-value crops reflect a mix of tree nuts, fruits, and vegetables that no other region can match. Based on annual data from the California Department of Food and Agriculture, the crops that consistently rank at the top by farm-gate value are almonds, grapes, strawberries, pistachios, lettuce, walnuts, tomatoes, hay (primarily alfalfa), oranges, and rice. The exact order shifts from year to year depending on commodity prices, acreage planted, and growing conditions, but these ten have dominated the list for the better part of a decade. What makes the list interesting is not just the dollar figures but the pressures reshaping it: water scarcity, warming winters, labor shortages, and volatile export markets.
Tree Nuts Run the Show
Almonds are typically the single most valuable crop in California, generating roughly $5 to $7 billion in annual farm-gate revenue depending on the year. California produces virtually all of the almonds grown in the United States and a large share of the global supply. Almond orchards stretch across the Central Valley, concentrated in counties like Kern, Fresno, Stanislaus, and Merced. The crop’s rise over the past two decades has been dramatic: acreage more than doubled between the early 2000s and the early 2020s, driven by strong export demand, particularly from India, China, and the European Union.
Pistachios have climbed the rankings even faster. The sector expanded from about 12,800 hectares in 1979 to a much larger footprint today, with yields stabilizing at roughly 2,900 kilograms per hectare in recent years.1Environmental and Sustainability Indicators. Comparative sustainability assessment of pistachio production: A case study of California (USA) and Castilla-La Mancha (Spain) California now accounts for nearly all U.S. pistachio production and is a dominant global exporter. Producer prices peaked around 2012 to 2015 and have softened since, but volume growth has kept the total crop value high, frequently landing pistachios in the top four or five.1Environmental and Sustainability Indicators. Comparative sustainability assessment of pistachio production: A case study of California (USA) and Castilla-La Mancha (Spain)
Walnuts round out the nut trio. They typically rank sixth or seventh by value, generating between $1 and $2 billion annually. Like almonds and pistachios, walnuts are a perennial tree crop that locks growers into long-term commitments: an orchard takes years to reach full production and represents a major capital investment. That permanence has implications for how the industry responds to water policy and climate change, a theme that runs through much of California agriculture.
Grapes and Their Three Lives
Grapes consistently rank as one of California’s top two or three crops by value, but the category is deceptively broad. It includes wine grapes, table grapes, and raisin grapes, each with distinct economics and growing regions. Wine grapes, concentrated in Napa, Sonoma, Paso Robles, and other coastal and inland valleys, command the highest per-ton prices and account for a large share of the total grape value. Table grapes are grown mostly in the southern San Joaquin Valley, especially around Bakersfield. Raisin grapes, centered on Fresno County, round out the category.
Combined, the three grape types regularly produce $5 to $6 billion in annual value, putting the category in a near-constant race with almonds for the top spot. Wine grapes are sensitive to a different set of pressures than most other California crops. They depend on specific microclimates, and warming temperatures are shifting which grape varieties can thrive where. Table grapes and raisins, meanwhile, face the same water and labor constraints as other Central Valley crops.
Strawberries Pack Value into Small Acreage
Strawberries are remarkable for how much revenue they generate per acre. The crop typically brings in $3 billion or more annually from a footprint that is small compared to almonds or grapes. California produces the vast majority of the nation’s strawberries, with production concentrated along the Central Coast in areas like Watsonville, Salinas, and Oxnard, as well as parts of Ventura County.
The crop is extremely labor-intensive. Strawberries are still picked by hand, and the cost and availability of labor have become defining issues for the industry. Research on California’s fruit and vegetable sector suggests that a 10 percent drop in the farm labor supply could reduce production in top-producing counties by as much as about 4 percent, with the effects running primarily through reduced harvested acreage rather than lower yields.2American Journal of Agricultural Economics. Farm labor supply and fruit and vegetable production Strawberries, with their particularly heavy reliance on hand harvest, sit squarely in the crosshairs of those dynamics. The industry has invested in breeding for flavor, shelf life, and disease resistance, but meaningful mechanization remains elusive for fresh-market berries.
Lettuce, Tomatoes, and the Vegetable Anchors
Lettuce and tomatoes are the two highest-value vegetable crops in the state and typically both appear in the top ten overall. Lettuce production is centered in the Salinas Valley, sometimes called “the salad bowl of the world,” and in Yuma County, Arizona, during winter months when many of the same California-based companies shift operations south. The crop generates roughly $2 billion or more in annual value and includes head lettuce, romaine, leaf varieties, and the bagged salad mixes that now dominate the retail market.
Tomatoes occupy a fascinating split. Fresh-market tomatoes are a meaningful but modest piece of the picture. Processing tomatoes, the ones that end up as sauce, paste, ketchup, and canned products, are the real volume story. California produces the overwhelming majority of the nation’s processing tomatoes. The crop’s success is inseparable from its mechanization history: the development of mechanical harvesters at UC Davis in the mid-twentieth century, paired with breeding of tougher, more uniform tomato varieties designed to withstand machine handling, transformed the industry.3HortScience. History of Mechanized Harvesting of Processing Tomatoes in California That combination of plant breeding and engineering gave California a cost advantage that persists today.
Hay, Oranges, and Rice
The bottom of the top-ten list tends to shift more than the top, but hay, oranges, and rice are the crops that most frequently fill those slots. Hay, primarily alfalfa, is unusual on the list because it is not sold directly to consumers. It is the backbone of California’s dairy industry, which is itself the state’s single largest agricultural commodity when dairy products are counted. Alfalfa is a heavy water user, and during the severe 2011 to 2017 drought, there was significant public pressure to cut back on its production. Statewide acreage did decline, but the picture was uneven: production persisted and even increased in certain parts of the state.4PubMed Central. Changes to California alfalfa production and perceptions during the 2011-2017 drought That persistence reflects alfalfa’s importance as a dairy feed input in regions where the dairy industry is concentrated.
Oranges, primarily navels for fresh eating and Valencias for juice, are grown in the San Joaquin Valley and parts of Southern California. The crop has shrunk in acreage over the past several decades as urban development has absorbed former citrus land in places like Riverside and Orange counties, but it still generates over a billion dollars in most years. Rice, grown in the Sacramento Valley where heavy clay soils hold water well, rounds out the list. California rice is largely medium-grain, and a substantial portion is exported to Asian markets where the variety is preferred.
Water Scarcity and How It Reshapes Crop Choices
Water is the single most consequential constraint on California agriculture. The state’s farming regions depend on a combination of surface water deliveries from a complex system of reservoirs and canals and groundwater pumped from underground aquifers. During droughts, surface deliveries get curtailed, and growers turn to groundwater. But decades of overpumping have depleted aquifers in parts of the San Joaquin Valley to the point where the ground has physically sunk.
California’s Sustainable Groundwater Management Act, passed in 2014, requires critically overdrafted basins to reach sustainability by the 2040s. Economic modeling of those targets suggests that achieving them would require the equivalent of a roughly 50 percent tax on groundwater in regulated areas, which could reduce perennial crop acreage by around 10 percent and increase fallowed land by about 21 percent.5NBER. Groundwater and Crop Choice in the Short and Long Run The distinction between short-run and long-run responses matters here. In any given dry year, growers can absorb higher water costs or fallow annual crops temporarily. Over the long run, though, the math changes: growers shift away from water-intensive perennials and leave more land unplanted.5NBER. Groundwater and Crop Choice in the Short and Long Run
This dynamic has particular significance for the nut crops that dominate the top of the value rankings. Almond, pistachio, and walnut orchards cannot be fallowed during a dry year the way a field of lettuce or tomatoes can. Trees that go unwatered die, wiping out years of investment. That rigidity means tree nut growers are among the most aggressive groundwater pumpers during droughts, and among the most exposed to long-term sustainability regulations.
Warming Winters and the Chill Problem
A less obvious but increasingly serious climate threat to California’s high-value tree crops is the loss of winter chill. Many fruit and nut trees require a certain number of cool hours during the dormant season to break dormancy properly and set fruit. When winters are too warm, the result is poor bloom timing, reduced fruit set, and lower yields.6Communications Earth & Environment. Seasonal climate forecasts show skill in predicting winter chill for specialty crops in California
Researchers have been developing seasonal climate forecasts to help growers anticipate chill shortfalls. These forecast models can predict whether winter chill will fall above or below critical thresholds for walnuts, pistachios, cherries, plums, and pears with considerable accuracy, in many cases correctly more than 85 percent of the time across growing regions.7Communications Earth & Environment. Seasonal climate forecasts show skill in predicting winter chill for specialty crops in California That kind of advance warning could help growers apply dormancy-breaking treatments or adjust management practices, but it does not solve the underlying problem of a warming climate steadily eroding the chill hours these crops need.
Pistachios face a particularly well-documented version of this challenge. In addition to drought, extreme heat, and shorter rainy seasons, warmer winters are altering the crop’s development cycle.1Environmental and Sustainability Indicators. Comparative sustainability assessment of pistachio production: A case study of California (USA) and Castilla-La Mancha (Spain) One proposed adaptation involves microclimate engineering, using reflective materials to bounce sunlight and keep orchard temperatures lower during critical winter periods. Economic modeling of that approach for California pistachios estimated it could generate between roughly half a billion and $1.4 billion in welfare gains over the 2020 to 2040 period, though the benefits would flow mostly to consumers rather than growers.8American Journal of Agricultural Economics. Microclimate Engineering for Climate Change Adaptation in Agriculture: The Case of California Pistachios
Export Dependence and Supply Chain Vulnerability
California’s most valuable crops are not just feeding the domestic market. The state is a major agricultural exporter, and several of the top-ten crops, especially tree nuts, depend heavily on overseas buyers. Almonds, pistachios, and walnuts are shipped in enormous volumes to markets in Europe, the Middle East, and Asia. That export orientation creates a vulnerability that became painfully clear during the supply chain disruptions of 2021.
Port congestion and container shortages during that period slashed California’s containerized agricultural exports by about 22 percent between May and November of 2021, with total losses exceeding $3.2 billion.9Applied Economic Perspectives and Policy. Supply chain disruptions and containerized agricultural exports from California ports Tree nut producers bore the heaviest financial impact. The losses from that period actually exceeded California agriculture’s losses from the 2018 trade war with China, which itself had been considered a major disruption.9Applied Economic Perspectives and Policy. Supply chain disruptions and containerized agricultural exports from California ports The episode underscored how much the value of California’s top crops depends not just on growing conditions but on the logistics of getting product onto ships and into foreign markets.
Labor and the Limits of Mechanization
California agriculture employs hundreds of thousands of farmworkers, and the availability and cost of that labor shapes which crops remain profitable. Crops like almonds, pistachios, and processing tomatoes have been substantially mechanized: almonds are shaken from trees by machines, and processing tomatoes have been machine-harvested since the 1960s.3HortScience. History of Mechanized Harvesting of Processing Tomatoes in California But many of the highest-value crops on the list, particularly strawberries, table grapes, and lettuce, still depend on hand labor for harvest.
The farm labor supply has tightened over the past two decades as immigration patterns have shifted and fewer workers enter agricultural employment. Research on California specifically has found that production losses from labor shortages flow mainly through reductions in the acreage that gets harvested rather than through lower yields on what is planted.2American Journal of Agricultural Economics. Farm labor supply and fruit and vegetable production In practice, that means growers may plant a full crop but leave portions of it in the field if they cannot find enough workers to pick it. For a crop like strawberries, where the harvest window is narrow and the product is perishable, even brief labor shortfalls translate directly into lost revenue.
Efforts to develop robotic harvesters for delicate fresh-market crops have attracted significant investment but remain in relatively early stages for most commodities. The gap between a prototype that works in a controlled setting and a machine that can reliably harvest a commercial field at the speed and selectivity of a skilled human picker is still substantial. For the foreseeable future, labor availability will remain a practical ceiling on how much of these crops California can actually bring to market, regardless of how much land is planted.
Why the Rankings Keep Moving
One thing that surprises people about the top-ten list is how much it shifts. Almonds and grapes have traded the number-one and number-two positions multiple times in recent years. Pistachios were barely on the radar twenty years ago and now regularly crack the top five. Dairy products, if counted as a commodity rather than excluded as a non-crop, would top the list most years and push everything else down a slot.
Several forces drive the movement. Commodity prices for nuts and grapes fluctuate with global demand, exchange rates, and the size of harvests in competing countries like Turkey, Iran, and Australia. A bumper almond year can push total value up even as per-pound prices drop. A freeze or drought year can reduce volume enough to lift prices but still lower total revenue. Meanwhile, new plantings of pistachios and almonds continue to come into production, adding acreage on a lag: a decision made five years ago to plant an orchard shows up in today’s harvest numbers.
Land-use competition plays a role too. As urban development presses into formerly agricultural areas, especially in Southern California and parts of the Bay Area, some crops lose ground literally. Citrus acreage in particular has contracted over decades as the suburban footprint expanded. At the same time, fallowing driven by water regulations is beginning to reshape the geography of the Central Valley, pulling some land out of production entirely and concentrating remaining agriculture on the most productive and best-watered parcels. The top-ten list a decade from now may look noticeably different, with the crops that can adapt to less water, fewer chill hours, and tighter labor markets rising, and those that cannot gradually losing their place.