Sour IPA
The Sour IPA marries tartness with hop aroma — a beer that is both sour and hoppy, two qualities long thought incompatible. It is most often produced by kettle souring: a fast, controlled acidification that lets brewers add a crisp lactic tang to a heavily hopped beer without the years of aging that traditional sour beers require.
#The Kettle-Souring Method
Traditional sour beers acidify slowly through mixed wild fermentation. The Sour IPA instead uses kettle souring: after the mash, brewers pitch Lactobacillus into the warm wort and hold it for one to two days until the target acidity is reached, then boil to kill the bacteria. Standard brewing yeast and a normal hop schedule follow. See Fermentation and The Boil.
Lactobacillus is strongly inhibited by hop compounds. Souring must happen before hops are added — which is why the Sour IPA's bitterness is kept low and its hops are loaded late, as flavor and aroma rather than bitterness. See Hop Additions and Timing.
#Sour Meets Hoppy
A bright lactic acidity turns out to pair naturally with citrus and tropical hop flavors — the tartness reads as "fruit," reinforcing mango, passionfruit, and lime impressions from the Hops. Many Sour IPAs add real fruit purée, blurring the line with the Milkshake IPA.
#Sensory Profile
| Element | Character |
|---|---|
| Aroma | Tropical and citrus hops, light tartness |
| Flavor | Clean lactic sourness woven with juicy hop flavor |
| Bitterness | Very low |
| Mouthfeel | Light, crisp, often spritzy — see The Science of Mouthfeel |
| Finish | Tart, dry, refreshing |
#Place in the Family
The Sour IPA belongs to the wild-and-tart branch of the family alongside the Brett IPA, and shares fruit-forward DNA with the Milkshake IPA. All sit within the Specialty and Experimental IPAs category.
#Continue Reading
- Brett IPA — the wild-fermented cousin
- Milkshake IPA — the fruit-forward relative
- The Boil — where kettle souring fits in the process
- Off-Flavors in IPA — distinguishing intentional sourness from faults
- Specialty and Experimental IPAs — the experimental frontier