Sugar Temperature Chart: Candy Stages by °F/°C (2026)

The sugar temperature chart maps seven candy stages: thread (230-235°F / 110-113°C), soft ball (235-240°F / 113-116°C), firm ball (245-250°F / 118-121°C), hard ball (250-265°F / 121-129°C), soft crack (270-290°F / 132-143°C), hard crack (300-310°F / 149-154°C), and caramel (320-350°F / 160-177°C). Each stage marks a higher sugar concentration and a firmer final texture, so a 5-10°F difference is what separates fudge from caramel and toffee from burnt sugar.

When I first started making caramels, I pulled the pot off the heat at 240°F instead of the 245°F firm-ball target, and the whole batch set into sauce instead of chewy squares. After losing three batches in one December, I clipped a $19 digital probe to the pot and started treating every 5°F stage window as a hard line. Since then I have cooked sugar through all seven stages, from 230°F thread syrup for glazes up to 320°F caramel for pralines, and the temperature is the only variable that reliably predicts the result.

Use our Candy Temperature Calculator to find the exact target stage for any recipe and adjust it for your elevation in one step.

The Complete Sugar Temperature Chart

This is the master reference. Every row is a citable fact: the stage name, its temperature window in both Fahrenheit and Celsius, the approximate sugar concentration of the syrup, the cold-water-test result, and what that stage is used to make.

The numbers are not arbitrary. As Harold McGee documents in On Food and Cooking, a boiling sugar solution can only get hotter as water evaporates and the sugar concentration climbs. Thread stage syrup is still about 20% water; by hard crack the syrup is 99% pure sugar; at caramel the last water is gone and the sucrose itself starts to break down and brown. That direct link between temperature and concentration is why a thermometer reading alone tells you the texture you will get when the candy cools.

What Each Sugar Stage Means

Thread Stage (230-235°F / 110-113°C)

Thread stage is the gentlest. When you lift a spoon and let the syrup drip, it spins thin threads about 2 inches long that do not form a ball. The syrup is roughly 80% sugar and 20% water, so it stays pourable when cool. This is the stage for fruit glazes, candied fruit syrups, and spun-sugar decorations.

Soft Ball Stage (235-240°F / 113-116°C)

Soft ball is the home of fudge, fondant, and pralines. Drop a little syrup into cold water and it gathers into a ball you can flatten flat between two fingers, then it slumps when you take it out. At about 85% sugar, soft-ball candy stays soft and creamy because enough water remains to keep it pliable. Pull fudge off the heat at 238°F and you get a melt-in-your-mouth set; overshoot to 245°F and it turns dry and crumbly.

Firm Ball Stage (245-250°F / 118-121°C)

Firm ball is the caramel and nougat range. The cold-water ball holds its shape but still gives under firm pressure, like a chewy gummy. At roughly 87% sugar, firm-ball candy is chewy rather than soft. The 245-250°F window is narrow, which is exactly why my early caramels failed at 240°F: just 5°F short of firm ball, the candy never developed enough chew to hold a square.

Hard Ball Stage (250-265°F / 121-129°C)

Hard ball, at about 92% sugar, produces rock candy, dense marshmallows, gummies, and divinity. The cold-water ball is rigid and holds its shape completely, though you can still deform it with effort. This is a wider 15°F window than the ball stages below it, so it forgives small thermometer errors better than soft or firm ball do.

Soft Crack Stage (270-290°F / 132-143°C)

Soft crack is where candy stops being chewy and starts being brittle. Dropped in cold water, the syrup forms threads that are firm but still bend a little before they break. At around 95% sugar, this is the stage for butterscotch and saltwater taffy. The 20°F span here means you have a bit more room, but the syrup is now hot enough to scorch, so stir down any crystals on the pan walls.

Hard Crack Stage (300-310°F / 149-154°C)

Hard crack, at about 99% sugar, makes lollipops, toffee, peanut brittle, and hard candy. The cold-water threads snap cleanly with no bend at all. This is the hottest stage before the sugar itself begins to color. Above 300°F the syrup climbs fast, often 10-20°F per minute, so this is where most beginners scorch a batch by walking away from the pot.

Caramel Stage (320-350°F / 160-177°C)

Caramel stage is past the cold-water test entirely. Here the sugar is essentially water-free and the sucrose molecules break apart and brown, a reaction called caramelization that creates the nutty, slightly bitter flavor of caramel sauce, praline, and the crackly top of crème brûlée. Light amber sits near 320°F; deep, almost-bitter caramel reaches 350°F. Past 360°F the sugar burns and turns acrid, so caramel is the one stage where seconds matter most.

How Do I Adjust Candy Temperature for Altitude?

Altitude changes everything because candy stages are defined relative to the boiling point of water, and water boils cooler as you climb. The rule is simple: subtract about 1°F from every target temperature for each 500 feet above sea level. At 5,000 feet, water boils at 202°F instead of 212°F, so every candy stage drops by 10°F.

The formula is: adjusted temperature = sea-level target minus (elevation divided by 500). So in Denver at 5,280 feet, you subtract about 11°F from every stage. The most reliable way to calibrate is empirical: boil plain water, read your thermometer, and subtract the gap from 212°F off all your targets. If your water boils at 203°F, every candy stage drops by 9°F. Our High-Altitude Baking Calculator handles the same boiling-point math for cakes, breads, and other recipes that need elevation tuning.

The Cold Water Test: Your Backup Thermometer

Before thermometers existed, candy makers read the sugar by dropping syrup into cold water and feeling the result. It still works as a cross-check today, and it takes about 10 seconds.

Use genuinely ice-cold water for an accurate reading, and always pull the pot off the heat before you test, because the syrup keeps climbing while you fish out the sample. Keep a second bowl of clean water to rinse your testing spoon between checks, since old sugar residue can seed crystals in the next drop. Test every 2-3 minutes once you are within 20°F of your target.

Do I Need a Candy Thermometer?

You do not strictly need one if you trust the cold-water test, but a good thermometer is the single best $20 you can spend on candy. It removes the guesswork from those narrow 5°F windows that decide texture.

A clip-on digital probe that reads to within 1°F is ideal because it gives a continuous reading without you holding anything over a 300°F pot. Skip infrared guns: they measure only the surface temperature and miss the hotter bulk of the syrup below. Calibrate before every session by boiling water; your thermometer should read 212°F at sea level, and if it reads 210°F, add 2°F to all of your targets. For converting between scales while you read a recipe, the Oven Temp Conversion Calculator handles Fahrenheit, Celsius, and gas mark in one place.

Why Candy Turns Grainy: Preventing Crystallization

The most common candy failure is not a temperature miss; it is crystallization. One stray sugar crystal falling from the pot rim into your syrup can chain-react and turn a smooth batch grainy in seconds. The fix is part chemistry and part technique.

Corn syrup works by wedging glucose molecules between the sucrose molecules so they cannot lock into a crystal lattice. Cream of tartar and lemon juice are acids that split some sucrose into glucose and fructose, which does the same job. On the technique side: dissolve all the sugar completely before you raise the heat, never stir once the syrup reaches a full boil, and brush the pot walls with a wet pastry brush to wash stray crystals back into the syrup. The Candy Making Calculator builds corn syrup into the recipes that need it, so you can scale a batch without guessing the anti-crystal ratio.

Putting the Chart to Work

Start by identifying the candy you want and reading its target stage off the master chart. Adjust that target for your elevation if you live above about 1,000 feet. Cook slowly and stir only until the sugar dissolves, then stop stirring and let the thermometer climb. Pull the pot off the heat the instant you hit the bottom of your target window, because residual heat will carry it up another few degrees. If you are scaling a recipe up or down at the same time, our Recipe Scaler keeps your sugar, water, and corn-syrup ratios in proportion so the stage temperatures still hold.

Frequently Asked Questions

What is a sugar temperature chart?

A sugar temperature chart is a reference table that maps the seven candy-making stages, thread through caramel, to their exact cooking temperatures in Fahrenheit and Celsius, the syrup's sugar concentration, and the candy each stage produces, so you know when to stop cooking.

What temperature is the soft-ball stage?

The soft-ball stage is 235-240°F (113-116°C), where the syrup is about 85% sugar and forms a ball in cold water that flattens between your fingers; it is the target for fudge, fondant, and pralines.

What is the hard-crack stage temperature?

The hard-crack stage is 300-310°F (149-154°C), where the syrup reaches about 99% sugar and forms brittle threads that snap cleanly in cold water; it is used for lollipops, toffee, and peanut brittle.

How do I adjust candy temperature for altitude?

Subtract about 1°F from every candy target for each 500 feet above sea level, because water boils cooler at altitude; at 5,000 feet you subtract 10°F, so soft ball drops from 235-240°F to 225-230°F.

Do I need a candy thermometer?

You do not strictly need one if you use the cold-water test, but a $15-$25 digital probe thermometer accurate to 1°F removes the guesswork from the narrow 5°F windows that decide whether candy sets soft, chewy, or hard.

What temperature is caramel?

Caramel forms at 320-350°F (160-177°C), past the cold-water-test stages, where the water is gone and the sugar itself browns; light amber sits near 320°F and deep caramel reaches 350°F before it burns above 360°F.

Related Calculators

• Candy Temperature Calculator — Find the exact sugar stage for any recipe and adjust it for your elevation.
• Candy Making Calculator — Scale candy recipes with the right corn-syrup and sugar ratios.
• High-Altitude Baking Calculator — Tune temperatures and ingredients for baking above 3,000 feet.
• Oven Temp Conversion Calculator — Convert between Fahrenheit, Celsius, and gas mark instantly.

Related Articles

• Oven Temperature Conversion Guide — Full Fahrenheit, Celsius, and gas mark chart for baking and roasting.
• Cooking Measurement Guide — Convert cups, grams, ounces, and milliliters for any recipe.
• Recipe Scaler Guide — Double or halve a recipe while keeping ratios intact.
• Sourdough Calculator Guide — Dial in hydration and starter ratios for consistent bread.

Conclusion

Candy is one of the few kinds of cooking where a single number decides the outcome. The sugar temperature chart works because temperature and sugar concentration rise together: 235°F means soft and creamy, 305°F means hard and brittle, and the stages in between are the whole vocabulary of candy. Read your target off the chart, adjust it for altitude, watch the thermometer instead of the clock, and pull the pot the moment you hit the window. Then run the numbers for your specific recipe and elevation with our Candy Temperature Calculator.

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This article is for educational purposes. Cooking sugar reaches temperatures well above boiling water; handle hot syrup carefully and supervise children. Temperatures are rounded to practical cooking values and vary with thermometer calibration and local barometric pressure.