I like chile peppers. Not because I want to prove I can eat the hottest one on the menu but because chile adds something wonderful to food—flavor, aroma, character, and sometimes just enough heat to make you sit up and pay attention.
New Mexico understands this better than most places. Chile is more than an ingredient here; it is part of the culture and a defining flavor of the state’s cuisine. I’ve written about New Mexico’s green chile and Hatch peppers before. This time, I’m taking a different look at one of my favorite foods: how do we measure the heat, and just how hot is hot?
Welcome to the Scoville scale where a pleasant little tingle can eventually lead to, well, Oh dear God, I’m on fire.
New Mexico knows chile
Where flavor became tradition
In New Mexico, chile isn’t something you simply sprinkle on a dish for a little heat. It is woven into the state’s food, history, agriculture, and culture. Ask a New Mexican about chile and you’re likely to get an opinion—and perhaps a spirited one—about red versus green.
For centuries, chile has been cultivated along the Rio Grande where Pueblo and Hispano communities developed traditions that continue today. Over time, New Mexico’s chile evolved into something distinctly its own with varieties bred for the state’s growing conditions and for the flavors people came to love.
That is what I appreciate most about New Mexican chile. The heat is only part of the story. A good chile has a flavor all its own and the best dishes use that flavor rather than simply trying to make your mouth burn.
But eventually someone had to come along and put a number on that burn.
That’s where things get interesting.
Who put a number on the fire?
Meet Wilbur Scoville
Before the Scoville scale, there was no simple way to tell someone just how hot a chile pepper was. You could say it was mild, hot, or downright painful but those descriptions were pretty subjective.
That changed in 1912 when Wilbur Scoville, a pharmacist working for Parke, Davis & Company in Detroit, developed a method for measuring the pungency of peppers. His Scoville Organoleptic Test used human taste testers to determine how much a pepper extract had to be diluted before its heat could no longer be detected.
The more dilution required, the higher the pepper’s Scoville Heat Unit, or SHU, rating.
The method sounds rather primitive today—and it was. But Scoville gave us something useful: a way to put a number on the fire.
And once we had numbers, we could start comparing just how much fire was hiding inside those innocent-looking peppers.
From pleasantly warm to Oh Dear God
Putting the Scoville scale into perspective
So, what do those numbers actually mean? The easiest way to understand the Scoville scale is to put some familiar peppers alongside one another.
A sweet bell pepper sits at zero Scoville Heat Units. There is no capsaicin, no burn, and no need for a glass of water. A jalapeño typically falls somewhere around 2,500 to 8,000 SHU while many New Mexico chile varieties occupy a similar general range.
Then the numbers start climbing. A habanero can reach hundreds of thousands of SHU and the superhot varieties push past one million.
That means the difference between peppers isn’t simply a matter of one being a little hotter than another. We’re talking about an enormous range of heat.
And here’s something worth remembering: New Mexico chile doesn’t have to be painfully hot to be worth eating. In fact, some of the varieties I enjoy most are relatively modest on the Scoville scale.
Which brings up an interesting question: why would anyone want to eat a pepper that’s hundreds of times hotter?
When heat becomes the whole point
Entering the world of superhot chiles
At some point, chile stops being something you add to dinner for flavor and becomes a test of endurance.
Habaneros are where things start getting serious with some varieties reaching well into the hundreds of thousands of Scoville Heat Units. Then come the superhots: the Bhut Jolokia, better known as the Ghost Pepper, followed by varieties such as the Trinidad Scorpion and other peppers whose heat is measured in the millions.
To put that in perspective, a pepper rated at 1 million SHU isn’t simply a little hotter than a 10,000-SHU chile. It represents a dramatically different level of capsaicin.
And yet people deliberately grow them, cook with them and, in some cases, compete to see who can eat them.
I have to admit, that’s not my idea of enjoying chile. Give me a flavorful New Mexico pepper with enough heat to get my attention and I’m happy. I don’t need dinner to become an emergency.
But what exactly is happening inside our mouths when chile makes us feel like we’ve swallowed a blowtorch?
Why does it hurt so good?
The strange science of the chile burn
Capsaicin is the compound responsible for the heat in chile peppers. It doesn’t actually raise the temperature of your mouth. Instead, it activates receptors that send a signal to your brain that you’re experiencing heat and irritation.
Your brain doesn’t know—or apparently doesn’t care—that the fire isn’t real. The result is the familiar burning sensation that makes some people reach for a glass of water while others reach for another bite.
And that’s part of the mystery of chile. The same sensation that tells us something hurts can also be pleasurable. For some people, the stronger the burn, the better.
Scientists have also found practical uses for capsaicin beyond the dinner table. Its ability to affect those pain receptors has made it useful in topical pain-relief products.
So the fire in a chile is real enough for our brains to notice, even though we’re not actually being burned.
Which brings me back to why I enjoy New Mexico chile in the first place. It’s not the pain I’m after. It’s the flavor.
Red or green?
Two stages of the same chile, two very different flavors
When New Mexicans ask, “Red or green?” they’re not simply asking which color you prefer. They’re asking which flavor you want.
Green chile is harvested while the peppers are still young. Fresh, bright and slightly grassy, it has a crisp, vegetal character with a distinctive chile flavor. Roasted green chile adds a wonderful smokiness and that combination of flavor and heat is hard to resist.
As the chile matures, it turns red. The flavor changes, becoming deeper, earthier, and somewhat sweeter. Red chile is often dried and ground into a powder or made into a rich sauce. Where green chile seems fresh and lively, red chile has a deeper, more developed character.
Neither is really better. They’re simply different expressions of the same wonderful ingredient.
Personally, I have room for both. That’s one of the pleasures of New Mexico cuisine: the same basic question—red or green?—can lead to two entirely different meals.
And if you can’t decide, there is always the New Mexican answer: Christmas—both red and green.
A final thought
The Scoville scale gives us a fascinating way to measure chile’s heat but numbers tell only part of the story. A pepper can be mild or insanely hot, yet its real magic is what happens when it becomes part of a meal.
That’s why I keep coming back to New Mexico chile. I’m not looking for the pepper that makes me wonder whether I should call 911. I want the one that adds flavor, character and just enough fire to make the next bite irresistible.
So I’ll happily rate my chile peppers on a scale of 1 to Oh Dear God I’m on Fire.
But when it comes to dinner, I’ll take delicious every time.
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Editor’s note
This article was originally published in September 2026. Information reflects what was accurate at the time of writing. Conditions, access, and amenities may change over time, so please verify current details before planning your trip.
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