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Toffee & Brittle Temperature — Hard Crack Stage Guide

Toffee and brittle require the hottest candy-making temperatures — the hard crack stage (300–310°F) where virtually all water has been driven out of the sugar syrup, creating a brittle, glass-like structure when cooled. At this temperature, sugar undergoes caramelization (browning reaction) that gives toffee and brittle their characteristic deep, complex flavor. Butter-based toffee (English toffee) targets 290–300°F for a slightly chewy texture; pure brittle hits 300–310°F for a snap-clean break.

At 300°F+, sugar syrup is extremely dangerous — it sticks to skin instantly and causes severe burns. Work carefully: use a heavy saucepan (not thin-bottomed), a long-handled thermometer or probe, and keep children away from the kitchen during hard crack stage cooking. Have cold water nearby (not to cool syrup, but in case of skin contact). Burn treatment: cool water immediately for 20 minutes.

Type a temperature to identify the stage

Complete Candy Temperature Stage Chart

Stage °F °C
Thread 230–235°F 110–112°C
Soft Ball 235–240°F 113–116°C
Firm Ball 245–250°F 118–121°C
Hard Ball 250–265°F 121–130°C
Soft Crack 270–290°F 132–143°C
Hard Crack 300–310°F 149–154°C
Caramel 320–360°F 160–182°C
Burnt Sugar 370+°F 188+°C

Frequently Asked Questions

What temperature is soft ball stage?
Soft ball stage is 235–240°F (113–116°C). When you drop a small amount of syrup into cold water, it forms a soft ball that flattens when removed. Used for fudge, fondant, and pralines.
What temperature is hard crack stage?
Hard crack stage is 300–310°F (149–154°C). Syrup dropped in cold water separates into hard, brittle threads. Used for lollipops, hard candy, toffee, and peanut brittle.
Can I use a meat thermometer for candy making?
Yes — if the thermometer's range includes candy temperatures. The Titan Grillers thermometer measures up to 572°F (300°C), covering all candy stages from thread through hard crack. It reads in 2–3 seconds, making it ideal for catching exact stage temperatures.
Why does altitude affect candy temperatures?
At higher altitudes, water boils at a lower temperature, so sugar syrups reach stages at lower temperatures too. For every 500 feet above sea level, subtract about 1°F from the target temperatures.

Frequently Asked Questions

What temperature is hard crack stage for candy?
Hard crack stage: 300–310°F. At this temperature, a drop of syrup in cold water shatters into brittle threads. Used for: lollipops and hard candy (300–310°F), peanut brittle (300–305°F), butterscotch hard candy (300°F), toffee (290–300°F for slightly chewy, 300°F+ for hard snap). Above 320°F, sugar begins to burn rather than caramelize.
What temperature for peanut brittle?
Peanut brittle target temperature: 300–305°F (hard crack stage). Add peanuts when syrup reaches 280°F — they toast in the syrup for the final 20°F of cooking. Add baking soda at 300°F, stir vigorously (it foams dramatically — this creates the airy, slightly porous texture of brittle), and pour immediately onto a greased sheet pan. Work quickly — brittle sets within 2–3 minutes.
Why did my toffee separate (butter and sugar split)?
Toffee separation (butter pooling on top or around the edges) is caused by: stirring after the butter fully incorporates (causes emulsion to break), cooking too fast over very high heat, or humidity. Prevention: cook over medium heat (not high), stir only to combine initially and then leave alone, and add butter at room temperature. If toffee separates: try adding 1–2 tablespoons of hot water and stirring vigorously to re-emulsify — this sometimes works. More reliably: start over.

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