Oat milk is better for the environment than almond milk in most measurable ways, particularly water use. Both are far lighter on the planet than dairy, which produces roughly three times the greenhouse gas emissions and uses ten times the land of plant-based alternatives. But when you compare the two against each other, oat milk comes out ahead on water consumption, and almond milk carries a unique burden on pollinator populations that oats don’t share.
Water Use Is the Biggest Difference
Water is where almond milk’s environmental reputation takes the hardest hit. Across studies comparing multiple plant-based milks, almond milk consistently ranks as the most water-intensive option. Almonds are a thirsty crop by nature, and roughly 80% of the world’s almonds grow in California, a state that cycles through severe droughts. Growing a single almond requires about 12 liters of water, and those demands add up fast at scale.
Oats, by contrast, grow in cooler, wetter climates like the upper Midwest, Canada, and Northern Europe, where rainfall does most of the work. The water footprint of oat milk is estimated at roughly one-sixth that of almond milk per liter produced. Water scarcity matters here: using large volumes of water in a drought-prone region carries far more ecological weight than using water where it’s abundant. This concept, sometimes called “water stress weighting,” makes almond milk’s footprint look even worse than the raw numbers suggest.
Carbon Emissions Are Closer Than You’d Think
On greenhouse gas emissions, the gap between oat and almond milk is much narrower. Both produce a fraction of the carbon that dairy does. Oat milk edges ahead slightly because oats require less processing and transportation in many supply chains, and almond orchards demand energy-intensive irrigation infrastructure. But the difference per glass is small enough that neither milk is a clearly bad choice from a carbon perspective alone. If climate impact is your primary concern, switching from dairy to either option is a far bigger win than choosing between the two.
Almond Farming’s Toll on Bees
One environmental cost unique to almond milk is its effect on honeybee populations. California’s almond orchards depend entirely on commercial pollination. Every February, roughly two-thirds of all managed honeybee colonies in the United States are trucked to California’s Central Valley to pollinate almond blossoms. It’s the largest managed pollination event in the world.
That concentration creates problems. In 2014, about 80,000 bee colonies (around 5% of all colonies brought in for pollination) experienced significant adult bee deaths or deformed broods. Research from the Association of American Universities identified combinations of insecticides and fungicides used in almond groves as a key culprit. In lab settings, certain pesticide combinations decreased larval survival by more than 60% compared to unexposed controls. The long-distance transport itself also stresses colonies, exposing them to diseases and parasites from other hives packed nearby during transit.
Oat production doesn’t rely on managed pollinators at all. Oats are wind-pollinated, so the crop sidesteps this entire issue.
Land Use and Soil Health
Almond trees are perennial crops that occupy land year-round for 20 to 25 years per planting cycle. That long commitment means the land can’t rotate between crops, which limits soil recovery. Oats, as an annual crop, fit naturally into crop rotation systems. Farmers frequently plant oats between heavier-feeding crops like corn or wheat because oats help suppress weeds, break pest cycles, and improve soil structure. In some farming systems, oats serve as a cover crop that actively rebuilds soil health rather than depleting it.
Per liter of milk produced, oat milk requires modestly less land than almond milk. Neither comes close to dairy’s land footprint, which includes both pasture and the vast acreage needed to grow animal feed.
Fertilizer Runoff and Water Pollution
Eutrophication, the process where excess nutrients from fertilizer wash into waterways and trigger algal blooms, is another metric worth considering. Oat farming typically uses more synthetic fertilizer than almond orchards, which means oat milk can score slightly worse on nutrient runoff depending on farming practices and regional conditions. However, when oats are grown in rotation with other crops, fertilizer inputs drop because the rotation itself helps maintain soil nitrogen levels. Almond orchards in California’s Central Valley also contribute to groundwater contamination through heavy fertilizer and pesticide application, so neither crop is pollution-free.
How Geography Shapes the Answer
Where you live affects the comparison. If you’re in Northern Europe or the northern United States, locally produced oat milk has a shorter supply chain and a lighter transport footprint. If you’re closer to California’s almond-growing regions, the shipping difference shrinks, though the water and pollinator concerns remain. Some oat milk brands source oats from regenerative farming operations, which further reduces their environmental impact through carbon sequestration in soil. Almond growers are also adapting, with some orchards adopting drip irrigation and recycled water systems that cut water use significantly, though these practices aren’t yet standard across the industry.
On balance, oat milk wins on water use, pollinator impact, and soil health, while running roughly even on carbon emissions and slightly behind on fertilizer runoff in some scenarios. For most people weighing the environmental question, oat milk is the stronger choice.