US Corn Yield by State: Where an Acre Grows the Most

Corn is America's biggest crop, and how much an acre yields varies widely across the country — from around 120 bushels in the dry Plains to over 230 in the most productive states. Surprisingly, the highest yields per acre aren't in the famous Corn Belt but in irrigated Western states, where farmers control every drop of water. This guide maps corn yield by state and explains what makes an acre so productive.

How much corn does an acre yield?

Corn yield is measured in bushels per acre, and the U.S. average has climbed astonishingly over the past century — from around 30 bushels an acre in the 1930s to well over 170 today, thanks to better seeds, fertilizer, and farming methods. But the average hides a wide range across states, shown on the map. Where water and growing conditions are ideal, an acre can produce more than 230 bushels; where it's dry, far less.

Which states have the highest yields?

Here's the surprise: the highest per-acre corn yields are in irrigated Western states — Washington, Oregon, and Arizona — not the Corn Belt. With irrigation, farmers there deliver exactly the water corn needs, free of drought risk, producing extraordinary yields. The famous Corn Belt (Illinois, Iowa, Nebraska) posts high yields too and grows the vast majority of the nation's total corn. The lowest yields are in the dry Plains — Kansas, Texas, Colorado — where much corn is grown without irrigation and depends on fickle rainfall.

The corn yield revolution

One of the great quiet achievements of modern agriculture is how much more corn an acre produces than it used to. A century of advances — hybrid seeds, then genetic engineering, plus synthetic fertilizer, mechanization, and precision farming — multiplied yields several times over. The same land now feeds far more livestock, fuels ethanol production, and exports more grain, all while the number of farmers shrank. It's a major reason food has grown cheaper and more abundant.

Why irrigation and the Corn Belt win

Corn is thirsty and sensitive to drought, so water is the master variable. Irrigated Western fields top the yield charts because water is never the limiting factor. The Corn Belt wins on a different strength: deep, rich glacial soils and reliable summer rainfall across an enormous area, which together make it the most productive large-scale corn region on Earth even without irrigation. The dry Plains lag because dryland corn rises and falls with the weather — a good rain year is bountiful, a drought year disastrous.