Almonds grow commercially in a surprisingly narrow band of the world, concentrated in regions with Mediterranean or semi-arid climates that deliver mild, wet winters and long, dry summers. California produces the vast majority of the global supply, but Spain, Australia, Iran, Turkey, and a handful of other countries contribute meaningfully. The story of where almonds thrive is shaped by an unusual combination of climate demands, pollination biology, and water access, and that geography is already shifting as the climate warms.
Where Almonds Originally Come From
The almond tree, Prunus dulcis, is native to southwestern Asia. Wild relatives still grow across a wide arc stretching from modern-day Iran and Turkey through Syria and Palestine.1ISHS Acta Horticulturae. AN ECONOMIC OVERVIEW OF TURKISH ALMOND SECTOR Genetic research supports a single domestication event in the Middle East, likely from wild species such as Prunus orientalis or Prunus turcomanica. From that point of origin, cultivated almonds spread in multiple directions, picking up genetic contributions from other wild species in Turkey and Central Asia along the way.2PubMed Central. Insights Into the Almond Domestication History Traders and settlers carried almond cultivation westward along Mediterranean trade routes, eventually reaching Spain, Italy, and North Africa. Much later, Spanish missionaries brought almonds to California in the 18th century, where the Central Valley turned out to be almost ideally suited for the crop.
What Climate Almonds Need
Almonds are among the earliest flowering fruit trees, which is both a strength and a vulnerability. The trees need a period of winter cold, called chill accumulation, to break dormancy and flower properly. Different cultivars vary widely in how much cold they require. Research on almond varieties in warm Mediterranean conditions found that local cultivars needed relatively modest chilling, while foreign cultivars required roughly one-and-a-half to two times as much.3Agricultural and Forest Meteorology. Chilling and heat requirements for local and foreign almond (Prunus dulcis Mill.) cultivars in a warm Mediterranean location based on 30 years of phenology records Separate work testing ten cultivars in Spain confirmed that flowering time is driven mostly by how much chill a cultivar needs, with heat requirements playing a smaller role.4Environmental and Experimental Botany. Chilling and heat requirements of almond cultivars for flowering
This early bloom habit makes almonds highly susceptible to late spring frosts, which can destroy flowers and slash yields. The problem is serious enough that researchers in Iran, where orchards are regularly exposed to spring frosts, have been studying grafting techniques that delay flowering as a passive frost-avoidance strategy.5PubMed Central. Unraveling the role of interstocks in delaying flowering and mitigating spring frost risk in Iranian commercial almonds through morphophysiological, biochemical, and molecular approaches The practical upshot is that almonds need a climate that delivers enough winter cold but not too much spring frost, plus a long warm season to let the nuts develop and dry on the tree. That combination exists reliably in only a few places on Earth.
California and Its Outsized Role
California’s Central Valley accounts for roughly 80% of the world’s almond supply and essentially all of the United States’ production. The region offers almost textbook almond-growing conditions: cool but not brutally cold winters, a reliable dry season from late spring through harvest in autumn, and deep alluvial soils. Orchards stretch through the Sacramento and San Joaquin valleys, with major concentrations in counties like Kern, Fresno, Stanislaus, and Merced.
The scale of California almond production has grown dramatically over the past few decades, and that expansion has created two interconnected pressures. The first is water. Almond trees are perennial crops that need irrigation year-round, and the Central Valley has been pumping groundwater at unsustainable rates for years. Drought years force painful choices between cutting water to trees that took years to mature or continuing to draw down aquifers. The second pressure is pollination. Most commercial almond varieties need cross-pollination to set fruit, which has turned California’s almond bloom into the largest managed pollination event in the world. Beekeeping operations across the country ship hives to California each February. As almond acreage has expanded, the bees have had to come from further and further away, increasing the distance and cost of interstate colony shipments.6IDEAS/RePEc. The Great Bee Migration: Supply Analysis of Honey Bee Colony Shipments into California for Almond Pollination Services
Spain and the Mediterranean Basin
Spain is the world’s second- or third-largest almond producer, depending on the year, and the largest in Europe. Spanish almond cultivation has historically been dominated by traditional rainfed orchards, many of them on marginal hillside land around the Mediterranean coast. These old-style plantings tend to have low yields compared to irrigated operations, but they are deeply embedded in the agricultural landscape of regions like Andalusia, Valencia, Murcia, and Catalonia.
That picture is changing. Almond plantations in Spain and across the Mediterranean are expanding, with new orchards designed under more intensive, irrigated systems that look more like California operations.7Agricultural Water Management. Quantitative analysis of almond yield response to irrigation regimes in Mediterranean Spain This intensification is driven partly by new self-compatible almond varieties that do not require cross-pollination, eliminating the need for interplanted pollinator trees or massive bee imports. One well-known example involves the Spanish cultivar “Guara” and the Italian cultivar “Tuono,” which DNA fingerprinting revealed to be genetically identical across all markers tested.8Scientia Horticulturae. The origin of the self-compatible almond ‘Guara’ Self-compatible varieties like these are reshaping how and where almonds can be profitably grown in Europe, because they remove the pollination bottleneck that has historically limited orchard design.
Italy, particularly the southern regions of Sicily and Puglia, has a long almond-growing tradition as well, though production volumes are much smaller than Spain’s. Other Mediterranean producers include Morocco, Tunisia, and Greece. Portugal has also been planting new orchards in the Algarve and Alentejo regions, drawn by the same combination of suitable climate and new intensive varieties.
The Middle East and Central Asia
Iran remains one of the world’s top almond producers, which makes sense given that the tree’s wild ancestors are native to the region.1ISHS Acta Horticulturae. AN ECONOMIC OVERVIEW OF TURKISH ALMOND SECTOR Iranian orchards are concentrated in provinces with cold winters and dry summers, including Chaharmahal-Bakhtiari, Isfahan, and East Azerbaijan. The late spring frost problem is particularly acute in Iran, where orchards sit at higher elevations and face unpredictable spring weather.5PubMed Central. Unraveling the role of interstocks in delaying flowering and mitigating spring frost risk in Iranian commercial almonds through morphophysiological, biochemical, and molecular approaches
Turkey, despite being part of the almond’s native range, has never developed its industry to the scale that its geography would suggest. Research has noted that Turkish almond husbandry has not yet reached its potential because the infrastructure for maintaining commercial orchards at scale is lacking.1ISHS Acta Horticulturae. AN ECONOMIC OVERVIEW OF TURKISH ALMOND SECTOR Much of Turkey’s almond production comes from scattered, semi-wild trees rather than organized orchards. Syria and Afghanistan also produce almonds, mostly from traditional plantings, though political instability has disrupted agricultural development in both countries for years.
Southern Hemisphere Producers
Australia has emerged as a serious almond producer over the past two decades, now ranking among the top five globally. Australian orchards are concentrated along the Murray River system in Victoria and South Australia, where irrigation infrastructure and a Mediterranean-type climate make commercial production feasible. The Australian harvest happens in February and March, which means the country’s almonds reach international markets during the Northern Hemisphere off-season, a useful commercial advantage.
Chile, Argentina, and South Africa also grow almonds, though on a much smaller scale. Each of these countries has been developing its almond industry with different cultivars and facing distinct challenges.9Almonds: botany, production and uses. Almond in the Southern Hemisphere Chile’s central valleys offer conditions similar to California’s, and the country has been steadily expanding plantings. Argentina produces almonds mainly in the Mendoza region, at the foot of the Andes. South Africa’s production is concentrated in the Western Cape. None of these regions is likely to rival California or Spain in the near term, but they represent growing pieces of the global supply map.
Self-Compatible Varieties and Why They Matter for Geography
Traditional almond varieties are self-incompatible, meaning a tree cannot pollinate itself. An orchard needs at least two compatible varieties planted in alternating rows, plus enough bees to move pollen between them. This requirement has historically constrained where almonds can be grown commercially, because it adds cost and complexity and makes the crop dependent on managed pollinators.
Breeding programs, especially in Spain and France, have developed self-compatible varieties that set fruit with their own pollen. Research has confirmed that self-pollination produces fruit with no significant difference in quality or yield compared to cross-pollination in these varieties.10Plant Breeding. Self‐pollination does not affect fruit set or fruit characteristics in almond (Prunus dulcis) This finding matters enormously for the geography of almond growing. Self-compatible varieties allow monovarietal orchards, meaning a grower can plant a single variety without worrying about pollination logistics. That opens the door for almond production in regions where managed bee colonies are expensive or unavailable, and it simplifies orchard management everywhere.
The spread of self-compatible cultivars is one reason why almond acreage is expanding in places like Portugal, Australia, and parts of North Africa. A region that might not have been economically viable under the old pollination model can now support a profitable almond orchard with the right variety.
Disease Threats That Follow the Crop
As almond cultivation has intensified and spread, disease problems have followed. Canker diseases and decline syndromes have been reported across all major almond-growing regions in the past decade, linked in part to the shift toward intensive farming systems designed to push yields higher. These problems have appeared in Mediterranean countries like Spain and Italy, as well as in California, Australia, and South Africa.11Plant Pathology. Insights Into the Aetiology of Almond Canker Diseases and Decline Syndromes: An Emerging and Complex Phytopathological Challenge Climate change is suspected of worsening the situation by stressing trees and creating conditions favorable for pathogens.
Specific diseases tend to be more associated with certain regions. The fungus Diaporthe amygdali, which causes branch canker, is a particular threat to almond cultivation in Europe, especially in Mediterranean areas.12PubMed Central. Study on the Susceptibility of Some Almond (Prunus dulcis) Cultivars to the Pathogen Diaporthe amygdali Red leaf blotch, caused by the fungus Polystigma amygdalinum, is a major foliar disease concentrated in Mediterranean and Middle Eastern regions.13PubMed Central. Assessing alternative strategies to control almond red leaf blotch through the reduction of Polystigma amygdalinum inoculum in leaf litter California, meanwhile, deals with its own set of fungal and bacterial problems, including hull rot and bacterial spot, aggravated by the warm, irrigated conditions of the Central Valley.
The disease landscape is one of the less-discussed factors shaping where almonds can grow sustainably. A region with perfect climate and soil can still be a poor choice if the local pathogen pressure overwhelms the available cultivars. Breeders are working to develop varieties with resistance to the most damaging diseases, but this is slow going because almond trees take years to reach bearing age and field trials take a long time to produce meaningful data.
How Climate Change Is Redrawing the Map
The almond map that exists today will look different by mid-century. The core problem is winter chill. Climate projections for California found that the area with sufficient winter chill for many fruit and nut tree species could shrink by 50 to 75% by the middle of this century, and by 90 to 100% by the end of it, depending on emissions scenarios.14PubMed Central. Climatic changes lead to declining winter chill for fruit and nut trees in California during 1950-2099 That projection is sobering for an industry that currently plants orchards expected to produce for 20 to 25 years.
Research specifically on almonds has confirmed that rising temperatures during dormancy reduce fruit set and yield, with the most damaging scenarios involving either extremely warm winters that prevent adequate chill accumulation or warm spells just before bloom that disrupt flower development.15Scientia Horticulturae. Impact of rising temperatures during dormancy on key yield components in almond The same dynamic applies to Mediterranean growing regions, where warming winters threaten orchards that depend on cultivars with moderate to high chilling needs.
The response from the industry is moving in two directions. One is breeding. Programs in California, Spain, and Australia are actively developing low-chill cultivars that can set fruit even with less winter cold than traditional varieties require. The wide natural range in chilling requirements among existing cultivars, as documented in the studies mentioned earlier, gives breeders useful genetic material to work with.4Environmental and Experimental Botany. Chilling and heat requirements of almond cultivars for flowering The other direction is geographic expansion. Regions that are currently too cold for reliable almond production, such as parts of northern Spain, southern France, or the Pacific Northwest in the United States, may become viable as winters warm. Meanwhile, current production areas may gradually become less suitable, especially if spring frosts become more erratic even as average temperatures rise.
The tension here is real. Almonds are a permanent crop. You do not replant an orchard in response to a bad winter the way you might switch a field from corn to soybeans. Growers are making 20-year bets on climate stability every time they plant a new block of trees, and the data increasingly suggests that the traditional almond-growing map is becoming unreliable as a guide to the future.
Regions to Watch
A few places are quietly building almond industries that barely existed a generation ago. Portugal has attracted significant investment in new almond orchards, particularly in the drier southern interior, where land prices are lower than in Spain and the climate is comparable. Morocco and Tunisia have been expanding plantings as well, aided by European demand for locally sourced alternatives to California almonds. In Central Asia, Uzbekistan has explored almond cultivation as part of broader efforts to diversify away from cotton monoculture, drawing on the fact that wild almond relatives are native to the region.
India, the world’s largest almond consumer, grows a small amount domestically in the Kashmir Valley and parts of Himachal Pradesh, but the climate and terrain limit expansion. Almost all of India’s almond consumption is met by imports, predominantly from California. Whether Indian production could meaningfully scale up depends on breeding varieties adapted to the local growing conditions and developing the orchard infrastructure, challenges that echo the situation described for Turkey.
In the Southern Hemisphere, Australia is the one to watch. The country has been aggressively expanding almond acreage, and its counter-seasonal harvest gives it a natural market niche. Water availability along the Murray-Darling Basin is the binding constraint. Australia’s experience with prolonged drought in the early 2000s gave the industry a preview of the water limits it may face again, and water rights in the Murray-Darling system are tightly regulated and increasingly expensive. How Australia manages that resource will determine whether its almond industry continues to grow or hits a ceiling.