Fresno, California sits in the heart of the San Joaquin Valley, and the sheer variety of crops grown there is staggering. Fresno County routinely ranks among the most valuable agricultural counties in the entire United States, producing everything from grapes and almonds to tomatoes, garlic, and cotton. The region’s long, hot summers, mild winters, and access to irrigation infrastructure make it suitable for hundreds of different crops, though water availability is an ever-present concern shaping what farmers plant and how much they can grow.
Grapes in Nearly Every Form
If one crop defines Fresno agriculture, it is the grape. The area around Fresno grows table grapes, wine grapes, and raisin grapes in enormous quantities. Fresno has long been associated with raisin production in particular, and the city has historically called itself the raisin capital of the world. California as a whole accounts for about 90% of the wine produced in the United States, 99% of the table grapes grown domestically, and nearly all of the country’s raisin grapes.1ScienceDirect (Woodhead Publishing). Grapevine Breeding Programs for the Wine Industry Fresno County contributes a substantial share of those totals, especially on the raisin side.
The economics are significant. California wine sales alone have been valued at over $23 billion, with table grapes adding roughly $1.5 billion and raisins another $725 million.1ScienceDirect (Woodhead Publishing). Grapevine Breeding Programs for the Wine Industry Drive through the Fresno area in summer and you will see mile after mile of trellised vines, many of them Thompson Seedless, which serve double duty as both a table grape and the primary variety dried into raisins. Wine grape varieties like Zinfandel, Barbera, and Muscat also thrive in the warm San Joaquin Valley climate, though the region’s wines are generally considered everyday rather than premium compared to cooler coastal appellations.
Tree Nuts and Their Expanding Footprint
Almonds have become one of the most valuable crops in Fresno County, and you can see evidence of that transformation in the orchards that have replaced cotton fields and other row crops over the past two decades. Almond trees flourish in the warm, dry conditions of the San Joaquin Valley, where the risk of rain during bloom is relatively low compared to other parts of the state. The trees need a period of winter cold to set fruit properly the following spring, and Fresno’s climate generally provides enough chill hours, though warming winters are something growers and researchers keep a close eye on.
Pistachios are another major tree nut crop in Fresno. Like almonds, pistachio trees require both summer heat and sufficient winter chill. Research on seasonal climate forecasting for specialty crops has specifically studied pistachio chill accumulation in Fresno, reflecting how important the crop is to the area and how sensitive it is to shifting winter temperatures.2Communications Earth & Environment. Seasonal climate forecasts show skill in predicting winter chill for specialty crops in California Walnuts round out the nut picture, though walnut acreage in Fresno County is smaller than in some neighboring counties to the north.
The shift toward tree nuts has reshaped the agricultural landscape in ways that matter beyond farm income. Unlike annual crops such as tomatoes or cotton, almond and pistachio orchards represent a multi-decade investment. Once those trees are planted, the land is committed. That permanence makes water planning more urgent because you cannot simply fallow an orchard during a drought year the way you can skip planting a row crop.
Stone Fruits and Citrus
Fresno County has a long history of producing stone fruits, including peaches, nectarines, plums, and apricots. The area east of the city, toward the foothills of the Sierra Nevada, provides slightly more elevation and subtly different growing conditions that suit these crops well. Plums grown in Fresno have been the subject of chill-requirement research alongside pistachios, underscoring the importance of reliable winter cold for the fruit to develop properly.2Communications Earth & Environment. Seasonal climate forecasts show skill in predicting winter chill for specialty crops in California
Much of the stone fruit grown in Fresno ends up dried, canned, or processed rather than sold fresh. Dried plums (prunes) and canned peaches from the San Joaquin Valley supply grocery shelves across the country. Fresh-market stone fruit is also grown, but the logistics of getting perishable fruit to consumers quickly favors areas with closer access to major population centers or ports, so Fresno’s stone fruit tends to lean toward processing varieties.
Citrus is present too, though Fresno County is not the dominant citrus producer in California. Navel oranges, Valencia oranges, mandarins, lemons, and grapefruit all grow in the region. The valley floor can get foggy and cold on winter nights, which is a risk for frost-sensitive citrus, but the overall warmth of the growing season and the availability of irrigation water make citrus viable, particularly in the southeastern parts of the county.
Vegetables and Field Crops
Fresno County produces a wide range of vegetables. Tomatoes are one of the biggest, both fresh-market and processing varieties. The processing tomato industry in the San Joaquin Valley is massive, supplying the raw material for canned tomatoes, pasta sauces, ketchup, and tomato paste. Fields of tomatoes harvested by machine in late summer are a common sight along Highway 99.
Garlic and onions are significant crops on the west side of the valley. Research on garlic irrigation conducted on the west side of the San Joaquin Valley has examined how irrigation frequency and water cutoff timing affect yield, reflecting the practical reality that farmers in this area are always optimizing how they use limited water.3Agricultural Water Management. Response of garlic to irrigation water Other vegetable crops grown in Fresno County include sweet potatoes, peppers, lettuce, cantaloupes, and various squash varieties. The long, frost-free growing season allows double-cropping in some cases, where farmers plant a cool-season crop in winter or early spring and follow it with a warm-season crop in summer.
Cotton was historically one of the defining crops of the San Joaquin Valley, and Fresno County still produces it, though acreage has declined over the years as water costs have risen and tree nut orchards have proven more profitable per acre-foot of water used. Alfalfa and other hay crops remain important, largely because they feed the dairy industry that is itself a major part of Fresno County agriculture. Corn grown for silage serves a similar purpose. These feed crops may not make headlines, but they underpin one of the county’s largest revenue streams.
Why Fresno Grows So Much
The diversity of crops in Fresno is not accidental. Several factors converge to make the area extraordinarily productive. The Mediterranean climate provides hot, dry summers that are ideal for ripening fruit and drying grapes into raisins, combined with winters that are cool enough to satisfy the dormancy requirements of deciduous trees. Rainfall is concentrated in the winter months, and summers are essentially rain-free, which reduces disease pressure on crops and makes harvest more predictable.
Soil quality varies across the county. The east side tends to have well-drained sandy loam soils excellent for tree crops, while the heavier clay soils on the west side are better suited to row crops and field crops. Irrigation infrastructure, including canals fed by the Kings River, the San Joaquin River, and the federal Central Valley Project, has transformed what would otherwise be semi-arid grassland into some of the most productive farmland on earth. Without that infrastructure, very little of what grows in Fresno today would be possible.
The labor force matters too. Fresno has a large agricultural workforce with deep expertise in the specialized tasks that high-value crops demand, from pruning almond trees to packing table grapes. The presence of packing houses, cold storage facilities, processing plants, and transportation networks in the region makes it practical to grow perishable crops far from the consumers who ultimately eat them.
Water Challenges and What They Mean for Cropping Decisions
Water is the perennial constraint on Fresno agriculture, and its availability shapes cropping decisions more than almost any other factor. The San Joaquin Valley has been in a state of chronic groundwater overdraft for decades, meaning farmers pump more water out of the ground than nature and infrastructure replenish. California’s Sustainable Groundwater Management Act, known as SGMA, is changing this by requiring local agencies to bring groundwater basins into balance, which will almost certainly mean less irrigated acreage in the years ahead.4PubMed. From fallow ground to common ground: Perspectives on future land uses in the San Joaquin valley under sustainable groundwater management
Survey research in the San Joaquin Valley has found that when asked about priorities for land that may lose irrigation access, about 35% of respondents preferred securing water supplies through measures like groundwater recharge, while 27% favored shifting to less water-intensive agriculture.4PubMed. From fallow ground to common ground: Perspectives on future land uses in the San Joaquin valley under sustainable groundwater management In other words, most people in the region want to keep farming rather than convert land to solar farms, habitat, or urban development. But the math is difficult. If pumping is restricted and surface water allocations remain unreliable in drought years, some farmland will inevitably come out of production.
This reality is already influencing what gets planted. Farmers with secure water rights tend to invest in high-value permanent crops like almonds and pistachios, which generate enough revenue per acre to justify the cost of water. Farmers with less reliable water access may stick with annual crops that can be idled in dry years without losing the long-term investment of an orchard. The west side of the valley, which has historically relied more heavily on federal water deliveries that get cut during droughts, faces particularly tough choices. Some of that land may transition to dryland farming, grazing, or managed habitat over the coming decades.
Dairy and Livestock Feed
Crop lists for Fresno County often focus on fruits, nuts, and vegetables, but the dairy industry is a quiet giant. Fresno County is home to large dairy operations, and feeding those herds requires enormous acreage devoted to alfalfa, corn silage, and other feed crops. Alfalfa is one of the thirstiest crops grown in the valley, which puts it in an awkward position as water becomes more expensive and regulated. Some analysts expect alfalfa acreage to decline as SGMA takes effect, potentially shifting some dairy production to other regions or forcing dairies to source feed from farther away.
Beef cattle also graze in the foothill areas east of Fresno, particularly on seasonal grasslands that green up during winter rains. This foothill grazing is a distinctly different kind of agriculture from the irrigated operations on the valley floor, relying on rainfall rather than canal deliveries or well water. Poultry operations exist in the county as well, though they are less prominent than dairy.
Organic Production and Specialty Crops
Fresno County has seen growth in organic farming, driven by consumer demand and the price premiums organic produce can command. Organic grapes, almonds, tomatoes, and various vegetables are produced in the area, though organic acreage remains a small fraction of total farmland. The dry summers that characterize the San Joaquin Valley actually help organic growers because low humidity reduces fungal disease pressure, one of the biggest challenges in organic production elsewhere.
Specialty crops fill niches throughout the county as well. Pomegranates have become increasingly visible in the landscape around Fresno, partly driven by consumer interest in the fruit’s perceived health benefits. Fig orchards, some of them very old, persist in certain areas. Olives grown for both oil and table consumption have a long history in the region, and the olive oil industry in particular has seen renewed interest as California-produced oils compete with imports. Kiwifruit, persimmons, and Asian pear also appear in smaller plantings, reflecting both the diversity of the climate and the ethnic diversity of the farming community, which includes growers with roots in Southeast Asia, Mexico, Central America, Armenia, and other regions who sometimes cultivate crops that connect to their culinary traditions.
How Climate Shifts Could Reshape the Crop Mix
Warming winters are a real concern for Fresno’s tree crops. Almonds, pistachios, stone fruits, and walnuts all require a certain number of chill hours during dormancy to produce fruit reliably. If winters continue to warm, some parts of the valley could eventually fail to meet those chill requirements in certain years, leading to reduced yields or crop failure. Climate researchers have already flagged Fresno as a location where chill accumulation for pistachios and plums sometimes falls outside predicted safe ranges, suggesting this is not a distant theoretical problem but a near-term operational one.2Communications Earth & Environment. Seasonal climate forecasts show skill in predicting winter chill for specialty crops in California
On the other hand, warmer conditions could extend the growing season and make crops that were previously marginal more viable. Some growers have experimented with subtropical fruits and other warm-climate crops that would not have been practical a few decades ago. The challenge is that warming brings not just opportunity but also increased evapotranspiration, meaning crops need more water in hotter conditions at exactly the time water is becoming less available. The interplay between rising temperatures and declining water access is the central tension shaping the future of Fresno agriculture.
Heat itself also affects workers. The extreme summer temperatures in the San Joaquin Valley, which regularly exceed 100°F from June through September, create dangerous working conditions for the farmworkers who plant, tend, and harvest these crops. California has regulations around heat illness prevention, including requirements for shade, water, and rest breaks, but heat-related illness and death remain ongoing risks in the region’s fields. Any shift toward even hotter summers raises the stakes for worker safety alongside the agronomic concerns about crop stress and water demand.