Sugar Stage Temperature Guide
Enter your thermometer reading and get the matching candy stage — from thread to hard crack — plus what it’s traditionally used for.
Stage
Fudge, fondant, pralines
The full stage chart
| Stage | Range (°F) | Typical uses |
|---|---|---|
| Thread | 215–234 | Syrups, glazes, sorbets |
| Soft Ball | 235–239 | Fudge, fondant, pralines |
| Firm Ball | 240–245 | Caramels |
| Hard Ball | 246–265 | Nougat, marshmallows, rock candy |
| Soft Crack | 266–289 | Salt-water taffy, butterscotch |
| Hard Crack | 290–309 | Toffee, brittle, lollipops |
| Caramelization | 310–349 | Caramel sauce, pralines |
Why sugar has stages at all
A pot of sugar and water starts out as a simple syrup that boils at just above 212°F (100°C). As it keeps cooking, water evaporates and the sugar concentration climbs, which raises the boiling point further. That rising temperature is a direct, reliable proxy for how much water is left in the syrup — and how much water is left determines whether the finished candy is soft and pliable or hard and brittle once it cools.
Each named stage marks a jump in texture: thread syrups stay pourable, ball stages form pliable lumps you can roll between wet fingers, and crack stages snap cleanly because almost all the water is gone. Knowing which stage a recipe calls for — and confirming it with a thermometer rather than guesswork — is the single most reliable way to get a consistent result batch after batch.
Frequently Asked Questions
What is the cold water test?
It's the traditional way candy makers judged a syrup's stage before thermometers were common: drop a bit of hot syrup into a cup of cold water and see how it behaves — from forming a soft thread to shattering into hard, brittle strands. Each temperature range corresponds to a distinct texture in the finished candy, which is why a thermometer reading and a stage name are used interchangeably.
Why do the stages matter so much?
As sugar syrup cooks, it loses water and its concentration rises, which changes how it sets once it cools. Ten degrees can be the difference between a soft, chewy caramel and a hard, snapping toffee, so hitting the right stage is the single biggest factor in whether a candy recipe turns out the way it's supposed to.
Does altitude affect these temperatures?
Yes. The stage chart is calibrated for sea level, where water boils at 212°F (100°C). At higher altitudes water boils at a lower temperature, so every stage shifts down too — a common rule of thumb is to subtract about 1°F (0.5°C) for every 500 feet (150m) of elevation above sea level.
Why does my thermometer give an unreliable reading?
A thermometer that touches the bottom of the pan reads the pan's temperature, not the syrup's, and an uncalibrated thermometer can be off by several degrees. Test yours in boiling water first (it should read 212°F / 100°C at sea level) and hold it in the syrup itself, clear of the pan's base.
Educational tool only. Stage ranges are standard sea-level reference values rounded for readability — adjust for altitude and confirm with a calibrated thermometer, especially for a batch that has to turn out right.