tags: [] - coffee/roasting - coffee/roasting/profile - coffee/brewing aliases: - Roasting for cold brew - Cold brew roast profile

Cold Brew Roasting¶

Tags: #coffee/roasting #coffee/roasting/profile #coffee/brewing Aliases: Roasting for cold brew, Cold brew roast profile Related: Roasting MOC | Development Time Ratio | Drop Temperature | Filter Roasting | Espresso Roasting Status: ✅ Complete

Overview¶

Cold brew roasting refers to the development of roast profiles specifically optimised for cold brew extraction — the process of steeping coarsely ground coffee in cold or room-temperature water for an extended period (12–24 hours). Cold brew's low extraction temperature fundamentally changes the solubility dynamics and flavour compound extraction compared to hot brewing methods, which has implications for the ideal roast level and development profile. The cold extraction environment favours different chemical compounds than hot extraction, producing a characteristically smooth, lower-acid, and highly caffeinated beverage.

How Cold Extraction Differs from Hot Brewing¶

Cold brew extraction occurs at 4–25°C (refrigerator to room temperature) over 12–24 hours rather than 90–96°C over 2–5 minutes:

Lower solubility: Most coffee compounds have significantly lower solubility at cold temperatures; the extended steep time partially compensates, but total extraction yield is typically lower per unit time than hot brew
Acid extraction: Many of the organic acids responsible for brightness in hot-brewed coffee (citric, malic, acetic) are less soluble at cold temperatures; cold brew is inherently lower in perceived acidity than the same coffee brewed hot
Bitter compound extraction: Some bitter compounds (quinic acid degradation products, some melanoidin-associated compounds) are less extracted at cold temperatures — contributing to cold brew's perceived smoothness
Caffeine: Caffeine is relatively soluble across temperatures; cold brew at concentrate ratios (1:4 to 1:8) has higher caffeine concentration per volume than standard hot-brewed coffee

Roast Level for Cold Brew¶

Because cold brewing naturally suppresses acidity and brightness, there is less need for a light roast to provide acidity balance than in hot filter brewing. However, the ideal roast level is debated:

Medium to medium-dark (City+ to Full City+, Agtron 42–58): - The most widely used range for commercial cold brew; chocolate, caramel, and body are emphasised - Darker roast increases solubility (useful for cold extraction) - Lower inherent acidity is further suppressed by cold extraction → very smooth cup - Suitable for both straight concentrate and RTD (ready-to-drink) cold brew

Light to medium (City to City+, Agtron 55–68): - Growing use in specialty cold brew contexts; preserves origin character - Cold brew from light-roasted Ethiopian or Kenyan can retain fruit complexity - Requires more careful extraction management (lower solubility at cold temp) - Better suited to smaller batch, specialty application than commercial RTD

Most commercial cold brew producers use medium to medium-dark roasted coffees, while specialty cold brew bars sometimes use lighter roasted single-origins for origin-expressive cold brew.

Profile Adjustments for Cold Brew Roasting¶

When developing a profile specifically for cold brew:

Slightly higher DTR than equivalent hot filter: 20–25% is common; the additional development improves solubility at cold temperatures, aiding extraction consistency over long steep times
Full City to Full City+ for commercial cold brew: The additional development at this level increases solubility and produces the chocolate and caramel character that works well in cold brew's smooth, low-acid presentation
Medium-roasted single-origin cold brew: Target City+ with standard DTR 20–22%; cup hot to verify quality, then test cold brew extraction at target ratio

Practical Extraction Parameters for Cold Brew¶

The roast profile affects extraction behaviour: - Darker roasted cold brew at 1:4 to 1:8 (coffee:water) ratio produces a concentrate; diluted 1:1 or 1:2 before serving - Lighter roasted cold brew may require slightly finer grind or longer steep at the same ratio to achieve target extraction yield - Cold brew extraction yield testing (refractometer reading on the finished cold brew) allows direct quality benchmarking

Key Facts¶

Cold brew extraction at 4–25°C over 12–24 hours naturally suppresses acidity and bitterness extraction compared to hot brewing
Commercial cold brew: typically roasted Full City to Full City+ (Agtron 42–52) for maximum body, chocolate, and solubility
Specialty single-origin cold brew: City+ (Agtron 54–60) preserves origin character in the low-acid cold brew format
DTR slightly higher (20–25%) than equivalent hot filter profile to improve cold extraction solubility
Darker roast levels suit the cold brew format because their additional solubility partially compensates for cold extraction's lower efficiency

References¶

Changelog¶

Date	Change
2026-04-27	Note created

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