Introduction:During the preparation of iced pour over coffee, the timing of adding ice can significantly affect the final flavor and temperature performance of the coffee. Should you add the ice before brewing or after extraction? Based on actual testing using Colombian Finca La Línea washed Geisha, this article compares the differences between the two ice-adding methods—from the brewing process and temperature changes to aroma expression and taste experience—to help you find your ideal iced pour over method.
A frequently discussed issue in making iced pour over coffee is whether to place ice cubes in the server before brewing or to add them after extraction. Although it may seem like a simple difference in sequence, it can actually impact the release of aroma, temperature control, and overall taste.
We specifically selected washed Geisha beans from Colombia’s Finca La Línea. This coffee features clear aromas of honeysuckle and citrus, making it highly suitable for observing flavor changes during iced pour over. The experimental conditions were kept consistent: 15 grams of coffee, a powder-to-water-to-ice ratio of 1:10:6 (i.e., 15 grams of coffee, 150 ml of hot water, and 90 grams of ice), a grind size of 9.5 on an Ek43 grinder with approximately 65% extraction through a #20 sieve, and a three-stage pour over at 92°C.
Many assume that the only difference between adding ice before or after brewing is the order of steps, but in reality, both methods affect cooling efficiency, aroma preservation, and final concentration. One common approach is to place the ice in the lower server before brewing, allowing the hot water to directly contact the ice during filtration and thus cool down. The other method is to add ice to the brewed coffee after all the liquid has dripped through.
To ensure accurate comparison, we strictly controlled all variables—including powder-to-water ratio, water temperature, grind size, and brewing technique—and employed a three-stage extraction: the first stage involved blooming with twice the coffee weight in water (30 ml) for 30 seconds; the second stage used a slow, wide circular pour of 70 ml of hot water; and the final stage, when dripping was nearly complete, used a small, circular pour of the remaining 50 ml of hot water. The total extraction time was controlled to around 1 minute and 30 seconds.
Due to the different timings of ice addition, we adjusted the start times and tasting sequences of the two cups: the cup with ice added beforehand started brewing 20 seconds earlier and was tasted first to avoid discrepancies in aroma or taste judgment caused by time lag. After extraction, both cups were immediately shaken to mix the ice and coffee thoroughly, accelerating cooling and evenly distributing flavors.
The actual test results showed that two minutes after extraction, the coffee with ice added beforehand measured 7°C, while the one with ice added afterward measured 13°C, indicating that pre-brew ice addition cools the coffee more rapidly. In terms of aroma, the post-brew ice coffee exhibited slightly stronger honeysuckle notes at the 2-minute mark, possibly because the coffee concentration had not yet been significantly diluted by the ice. However, overall mouthfeel was slightly smoother and rounder for the post-brew ice coffee. That said, when both cups were tasted again after about five minutes, the differences in aroma and concentration had almost disappeared, with their performances becoming quite similar.
In summary, the experimental conclusion shows that the actual flavor differences between iced pour over coffee made with pre-brew and post-brew ice addition are not significant. The slight initial variations mainly stem from the melting speed of the ice and changes in coffee concentration. If you prefer quicker cooling, go with pre-brew ice; if you favor a more complete aroma release, post-brew ice is also a great option. Most importantly, adjust the amount of ice and brewing parameters according to your own taste preferences to find your optimal balance.
The above content is compiled by CoffeeHunters, a coffee news website.
