11 Facts About Idaho That Most Locals Don’t Know About

Idaho may be known for potatoes, mountains, and more hidden hot springs than anyone can count, but the Gem State is packed with secrets most locals never hear about. Behind those quiet forests and long stretches of highway lies history, geology, and straight-up weirdness worth bragging about. These facts will make even the most outdoorsy Idahoan raise an eyebrow.

1. Idaho Has the Deepest Canyon in North America

Forget the Grand Canyon — Hells Canyon is deeper by almost 2,000 feet. Most Idaho locals don’t realize they’re living next to a national record-breaker.

2. Idaho Produces More Trout Than Any State in the U.S.

The Snake River Aquaculture industry makes Idaho America’s top trout producer. Your grocery-store trout? Odds are it came from Idaho.

3. Idaho Is Home to One of the Largest Basalt Lava Fields in the World

Craters of the Moon spans 750,000 acres of ancient lava flows. Astronauts trained there for the Apollo moon landings.

4. The First Chairlift in the World Was Built in Idaho

Sun Valley installed the very first ski chairlift in 1936. It changed skiing forever and made Idaho a global pioneer in the sport.

5. Idaho Has a Lake So Deep the Bottom Has Never Been Reached

Lake Pend Oreille is over 1,150 feet deep — deeper than Loch Ness — and the exact bottom hasn’t been fully mapped. The U.S. Navy even tests submarines there.

6. Idaho Is the Only State Seal Designed by a Woman

In 1891, Emma Edwards Green created Idaho’s state seal — the only one in the U.S. with a female designer.

7. Idaho Has a Town Named “Atomic City”

With a population under 50, its name comes from nearby nuclear research sites, including the first nuclear-powered city test in the United States.

8. More Than 70 Gem Types Are Found in Idaho

That’s why it’s called the “Gem State.” Garnets, opals, star garnets, and jasper are all commonly found here.

9. The Longest Main Street in America Is in Idaho

Lewiston’s Main Street stretches over 30 miles when combined with connected highways. It’s longer than some interstates.

10. Idaho Once Had a Volcano Erupt So Violently It Changed Global Climate

The Yellowstone hotspot, which helped form eastern Idaho’s landscape, produced some of the largest volcanic blasts in Earth’s history.

11. Idaho Has Sand Dunes Taller Than Many Buildings

Bruneau Dunes features the tallest single-structured sand dune in North America, rising 470 feet. Yes, you can sled down it.

Idaho might seem quiet to outsiders, but it’s one of the most geologically and historically fascinating states in America. From world-changing inventions to mysterious lakes and canyon records, the Gem State truly earns its nickname. Share these facts and enjoy watching Idaho locals suddenly feel a whole lot more impressed with their home.