Candy Making Stage Timer

Common uses for a candy making stage timer

Fudge and fondant at soft ball
Caramels at firm ball
Toffee and brittle at hard crack
Sugar work and spun sugar

Sugar stages are defined by temperature, not by time. As a syrup boils, water evaporates and the sugar concentration rises, and each named stage — thread, soft ball, firm ball, hard ball, soft crack, hard crack — corresponds to a specific concentration and therefore a specific boiling point^[1]. What sets the stage is how hot the syrup is, and nothing else.

So a timer cannot tell you when you have arrived. What it is genuinely useful for is the opposite problem: the stages arrive slowly at first and then very fast, because the last of the water leaves quickly. The gap between soft crack and hard crack can be under a minute, and burnt sugar follows shortly after. Use the timer to remind you to start watching closely, and a thermometer to tell you when to stop.

The cold water test

Before thermometers, cooks judged stages by dropping a little syrup into cold water and feeling what it formed. It still works, and it is a useful check on a thermometer you do not trust. A drop that forms a soft, squashable ball is soft ball; one that forms a firm ball that holds its shape is firm ball; one that separates into hard, brittle threads is hard crack.

The names describe exactly what you feel, which is why they have survived. If your thermometer and the water test disagree, calibrate the thermometer in boiling water before trusting it further.

Altitude shifts every number

Because the stages are boiling points, they move with atmospheric pressure just as water's does. At altitude every stage arrives at a lower reading, and following a sea-level recipe produces syrup that is more concentrated than intended — fudge that sets like glass, caramel that turns brittle.

The usual correction is to subtract about 0.5 °C from each target for every 150 m above sea level. Check your own boiling point of water first: whatever it falls short of 100 °C is the same amount to subtract throughout.

Standard confectionery stages, documented consistently across culinary references^[1]. All are at sea level — subtract about 0.5 °C per 150 m of altitude.

Sugar stages by temperature
Stage	Temperature	Cold water test	Used for
Thread	110–112 °C (230–234 °F)	Forms a fine thread	Syrups, glazes
Soft ball	112–116 °C (234–241 °F)	Soft, squashable ball	Fudge, fondant, pralines
Firm ball	118–120 °C (244–248 °F)	Firm ball, holds shape	Soft caramels
Hard ball	121–130 °C (250–266 °F)	Hard but still pliable	Nougat, marshmallow
Soft crack	132–143 °C (270–290 °F)	Flexible threads	Taffy, butterscotch
Hard crack	149–154 °C (300–310 °F)	Brittle threads that snap	Toffee, brittle, lollipops
Caramel	160–177 °C (320–350 °F)	Colours amber to brown	Caramel, praline

Stages arrive slowly then very fast — the gap between soft crack and hard crack can be under a minute.
Calibrate the thermometer in boiling water first; a few degrees of error changes the stage entirely.

Source: On Food and Cooking: The Science and Lore of the Kitchen — sugar concentration and boiling points (ISBN 978-0-684-80001-1)

Sources

On Food and Cooking: The Science and Lore of the Kitchen — sugar concentration and boiling points (ISBN 978-0-684-80001-1) , Harold McGee, Scribner (Revised edition, 2004) — accessed 2026-07-28

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❓ Frequently Asked Questions

Can a timer tell me when sugar reaches soft ball?

No. Sugar stages are defined by temperature, because each corresponds to a specific sugar concentration and therefore a specific boiling point. A timer is useful for reminding you to start watching closely — a thermometer tells you when you have arrived.

Why do the stages arrive so suddenly at the end?

Because the last of the water leaves quickly. Early on there is plenty to evaporate and the temperature climbs slowly; once the syrup is concentrated, small losses raise the temperature fast. The gap between soft crack and hard crack can be under a minute.

What is the cold water test?

Dropping a little syrup into cold water and feeling what it forms — a soft squashable ball, a firm ball, or brittle threads that snap. The stage names describe exactly what you feel, and it is a good check on a thermometer you are not sure about.

Do I need to adjust sugar stages for altitude?

Yes. The stages are boiling points, so they fall with atmospheric pressure. Subtract roughly 0.5 °C from every target for each 150 m above sea level, or measure the boiling point of water where you are and subtract the same shortfall throughout.

Why did my fudge set hard as glass?

The syrup went past soft ball. A few degrees separates fudge from something far harder, so an uncalibrated thermometer or an unadjusted sea-level recipe at altitude will do it. Calibrate in boiling water before blaming the recipe.

Should I stir the syrup while it boils?

Generally not once it is boiling. Stirring encourages crystallisation on the pan sides, which can seed the whole batch and turn it grainy. Most recipes have you stir only until the sugar dissolves, then leave it entirely alone.