Which U.S. state grows the most potatoes?

Idaho and Potatoes: A Match Made in Agricultural History

If you've ever grabbed a bag of russet potatoes at the grocery store, there's a very good chance it came from Idaho. The Gem State produces more potatoes than any other state in the U.S., and it isn't particularly close. Idaho consistently accounts for roughly 30 to 35 percent of the entire country's potato crop — a staggering share for a single state.

The Numbers Behind the Dominance

In a typical year, Idaho harvests well over 130 million hundredweight of potatoes (a hundredweight equals 100 pounds). The state plants potatoes across more than 300,000 acres of farmland, primarily in the Snake River Plain — a broad, flat volcanic region that cuts across the southern part of the state. Washington and Wisconsin are the next biggest producers, but they trail Idaho by a significant margin.

Why Idaho? It's All About the Geology

Idaho's potato dominance isn't an accident — it's written into the landscape itself. The Snake River Plain sits on top of ancient volcanic rock, and centuries of erosion have produced a layer of rich, loose, well-draining soil that potatoes absolutely thrive in. Rocky, compacted ground is a potato's enemy; light, porous soil lets the tubers expand freely and absorb nutrients evenly.

Add to that the region's high elevation (many farms sit above 4,000 feet), which means cool nights even during summer. That temperature swing between day and night encourages potatoes to store more starch — which is exactly what gives Idaho russets their famously fluffy, light texture when baked or mashed.

Water Makes It Work

The Snake River isn't just a pretty landmark — it's the engine behind Idaho's agricultural output. An extensive network of irrigation canals draws water from the river and its tributaries, allowing farmers to grow potatoes in what would otherwise be a semi-arid environment. Without that irrigation infrastructure, built up over more than a century, the whole operation simply wouldn't exist.

The Russet Burbank Reigns Supreme

Idaho grows many potato varieties, but the Russet Burbank is the superstar. Developed in the 19th century by horticulturist Luther Burbank, this variety became the backbone of Idaho's industry — and later the backbone of the fast food world. McDonald's famously standardized its French fries around the Russet Burbank, locking in a relationship between Idaho farms and global fast food chains that still holds today.

More Than Just a Crop

Potatoes are so central to Idaho's identity that the state nickname is practically synonymous with them. Idaho license plates proudly read "Famous Potatoes." The potato industry generates billions of dollars annually for the state economy and supports tens of thousands of jobs in farming, processing, and distribution.

So next time you bite into a baked potato or a crispy fry, there's a solid chance Idaho's volcanic soil, mountain water, and cool summer nights had everything to do with how good it tastes.