What is Sake? A Complete Guide to Japanese Rice Wine [2025 Update]

Sake is a Japanese alcoholic drink brewed from rice, water, koji mold, and yeast. Unlike wine, it is brewed like beer: koji converts rice starch into sugar that yeast ferments, reaching about 15 to 16% ABV. William Stuart, founder and head brewer at Colorado Sake Co., brews it in RiNo, Denver, the first licensed sake brewery in the state.

**Quick Answer:** Here in Colorado, we're often asked "what exactly is sake?" Simply put, sake is a traditional Japanese drink made from fermented rice. Think of it as something between wine and beer - though it drinks like wine, it's brewed more like beer. What makes it special is its unique brewing process that turns rice starch into sugar and alcohol at the same time, giving you a clean, smooth drink that's usually around 15-17% alcohol. Plus, since it's just rice, water, and koji, it's naturally gluten-free and doesn't have any of those tannins that can give you a wine headache. [Understanding Sake Basics][0] [How Sake is Made][1] [Types of Sake][2] [Sake Grades and Classifications][3] [How to Drink Sake][4] [Sake vs Other Alcoholic Beverages][5] [Frequently Asked Questions][6]

Understanding Sake Basics

Sake, often called Japanese rice wine, is actually closer to beer in its brewing process. As Colorado's first sake brewery, we're often asked to explain this fascinating beverage that's been part of Japanese culture for over 1,000 years. At its core, sake is an alcoholic beverage made from four simple ingredients: rice, water, koji (a special type of mold), and yeast. What makes sake unique is its versatility and complexity. Unlike wine, which typically contains 11-14% alcohol by volume (ABV), premium sake usually ranges from 15-17% ABV. But don't let that percentage fool you, sake is known for its surprisingly smooth and clean taste profile.

How Sake is Made

The sake brewing process is a beautiful marriage of tradition and precision. Here's how we craft our sake at Colorado Sake Co.: 1. Rice Milling First, we mill the rice to remove the outer layers, exposing the starchy core. The degree of milling helps determine the sake's grade and flavor profile. 1. Rice Washing and Soaking After milling, the rice is carefully washed and soaked to achieve the perfect water content for steaming. 1. Koji Making This is where the magic happens. We cultivate koji mold on a portion of the steamed rice, which converts the rice starches into fermentable sugars. 1. Fermentation Unlike beer or wine, sake undergoes a unique multiple parallel fermentation process where the conversion of starch to sugar happens simultaneously with the conversion of sugar to alcohol.

Types of Sake

[0]: #basics [1]: #brewing-process [2]: #sake-types [3]: #grades [4]: #drinking-sake [5]: #comparison [6]: #faqs

At Colorado Sake Co., we specialize in premium sake brewing, focusing exclusively on high-grade junmai ginjo and junmai daiginjo varieties. We're also proud to operate the largest namazake tap system in the United States, with 12 rotating taps offering fresh, unpasteurized sake.

Our Premium Sake Categories

Junmai Ginjo

Premium sake made with rice milled to at least 60% of its original size. This level of milling, combined with our pure ingredients and meticulous brewing process, creates sake with clean, light, and fruity notes. The term "junmai" means pure rice - we never add distilled alcohol, letting the quality of our ingredients and brewing shine through.

Junmai Daiginjo

Our super-premium sake category, using rice milled to 50% or less of its original size. This intensive milling process, along with our careful brewing techniques, produces incredibly complex and delicate flavors. These sakes represent the pinnacle of our craft, offering elegant aromatics and sophisticated taste profiles.

Namazake: Fresh, Unpasteurized Sake

One of our unique specialties is namazake (fresh, unpasteurized sake) served on tap. With 12 rotating taps - the most extensive selection in the country - we offer an unparalleled sake experience. Namazake is known for its vibrant, fresh flavors and lively character, as it hasn't undergone the traditional pasteurization process. This style of sake is rarely found outside Japan, making our tap system a unique destination for sake enthusiasts.

Sake Grades and Classifications

While there are many grades of sake in the traditional Japanese classification system, at Colorado Sake Co., we focus exclusively on premium and super-premium grades. Here's why we've chosen to specialize in these top-tier categories:

Premium Grades: Junmai Ginjo

Rice milled to at least 40% removed (60% remaining) - Pure rice sake with no added alcohol - Labor-intensive brewing process - Sophisticated flavor profiles - Pronounced aromatics - Excellent cold or room temperature

Super Premium Grades: Junmai Daiginjo

Rice milled to at least 50% removed (50% or less remaining) - The highest grade of pure rice sake - Extremely meticulous brewing process - Delicate, complex flavors - Enhanced aromatics - Best served chilled to preserve subtle notes Our commitment to producing only these premium grades ensures that every sake we create meets the highest standards of craft brewing. Whether you're new to sake or a seasoned enthusiast, our premium selections offer an authentic and refined taste experience.

How to Drink Sake

At Colorado Sake Co., we're proud to offer the largest namazake tap system in the United States. Our 12 rotating taps showcase the vibrant, fresh characteristics that make unpasteurized sake special. Here's our guide to getting the most from your sake experience:

Temperature Matters

* Chilled (45-50°F): Ideal for our namazake, enhancing its fresh, crisp characteristics * Room Temperature (68°F): Allows you to experience the full flavor profile * Avoid serving premium namazake warm, as heat can diminish its subtle complexities

Tasting Room Experience

* Sake flights to compare different styles * Food pairing recommendations * The subtle differences between our junmai ginjo and junmai daiginjo offerings * The unique characteristics of namazake versus traditional pasteurized sake

Sake vs Other Alcoholic Beverages

While sake is often called "rice wine," it stands apart from other alcoholic beverages in fascinating ways. Let's break down what makes sake unique:

Sake vs Wine

No tannins: Unlike wine, sake doesn't contain tannins, resulting in no dry, puckering sensation and no wine headaches for those sensitive to tannins - Smaller alcohol molecules: Sake's alcohol molecules are smaller than wine's, allowing for smoother absorption by the body - Lower acidity: Sake typically has a pH of 4.3-4.7, compared to wine's 2.8-3.8, making it gentler on the stomach - Less sugar: Premium sake contains minimal residual sugar, often less than 2g/L, while many wines contain 8-12g/L

Sake vs Beer

Higher alcohol content: Sake typically contains 15-17% ABV compared to beer's 4-6% - No hops: Sake doesn't use hops, eliminating bitter notes common in beer - No carbonation: Natural sake is still, though some modern varieties add bubbles - Gluten-free: Unlike beer, sake is naturally gluten-free as it's made from rice - Complex fermentation: Sake undergoes multiple parallel fermentation, while beer follows a linear fermentation process

Sake's Unique Properties

Umami: Sake is one of the few alcoholic beverages that contains significant umami (savory) notes - Amino acids: Premium sake contains more amino acids than wine or beer, contributing to its complex flavor profile - Temperature versatility: Sake can be enjoyed at a wider range of temperatures (35°F to 105°F) than most other alcoholic beverages - Clean finish: Due to its unique brewing process and filtration, sake typically has a cleaner finish than other alcoholic beverages

Health Considerations

Fewer congeners: Sake contains fewer congeners (byproducts of fermentation) than many other alcoholic beverages, which some believe contributes to less severe hangovers - No sulfites: Unlike wine, sake doesn't require sulfites for preservation - Naturally occurring vitamins: Sake contains several vitamins and amino acids from the rice and koji fermentation process

Frequently Asked Questions

Is sake stronger than wine?

While sake typically has a slightly higher alcohol content (15-17%) compared to wine (11-14%), it often feels lighter due to its clean taste profile and lack of tannins.

Should sake always be served hot?

No, many premium sakes are best enjoyed chilled or at room temperature. The serving temperature can enhance different aspects of the sake's flavor profile.

How long does sake last after opening?

Once opened, sake is best consumed within 2-3 weeks if stored properly in the refrigerator. For the best experience, we recommend enjoying it within the first week of opening.

_Ready to dive into the world of sake? Come visit our [taproom][0] to try some fresh sake straight from our 12 rotating taps, join us for [Sake 101][1] to learn more, or check out our [online store][2] to grab a bottle for home. Want to make it a full experience? Sign up for one of our popular [Sushi 101 classes][3] or swing by for [weekly events][4] like trivia nights and dim sum brunch._ _Looking to learn more? Check out our other sake guides:_ * [Is Sake Gluten Free? Here's the Scoop][5] * [Sake vs Saki Explained][6] * [Understanding Sake Alcohol Content][7] * [Sake Cocktails Guide][8] [0]: /colorado-sake [1]: /events/sake-101 [2]: /sakestore [3]: /events/sushi-101 [4]: /events [5]: /sake-insights/is-sake-gluten-free-ingredients-brewing-safe-options [6]: /sake-insights/sake-vs-saki-explained [7]: /sake-insights/sake-alcohol-content-vs-wine [8]: /sake-insights/sake-cocktails-guide

Colorado Sake Co. · Inside the cellar · 2026 log

A month inside American Standard This timeline follows one real Colorado Sake Co. American Standard production log: the moromi, or main fermenting mash. Watch the tank held cold for weeks (red) while the alcohol climbs from near zero to ~14% (blue). Drag the reading or press play to follow the recorded measurements.

Temperature (°C, left) Alcohol, ABV (%, right)

▶ Reading 1 / 14

, day 0 ,

Temp,

Alcohol,

SMV,

pH,

,

How to read this

Cold and slow is the point. The tank is built up in staged additions of rice, koji, and water (sandan-shikomi), then held in the single digits Celsius for three to four weeks. Low-temperature fermentation is a defining part of ginjo-zukuri and supports its characteristic fruity aroma.

SMV (sake meter value) is a density-based index, not a direct sugar reading. It generally rises as extract declines and alcohol accumulates, though acidity also affects how sweet or dry the finished sake tastes. Watch SMV rise as the blue alcohol line climbs.

What this chart covers. These readings cover American Standard moromi only. They do not establish that every Colorado Sake Co. product follows this exact base or process.

Full lab log, American Standard · Feb 2026 (Colorado Sake Co.)

Date	Reading	Temp °C	pH	SMV	ABV	Note

Full lab log, American Standard · Mar 2026, pressed (Colorado Sake Co.)

Date	Reading	Temp °C	pH	SMV	ABV	Note

Full lab log, American Standard · May 2026, tank M3 (Colorado Sake Co.)

Date	Reading	Temp °C	pH	SMV	ABV	Note

Source: Colorado Sake Co. 2026 lab & fermentation log, temperature, pH, titratable acidity, amino acids, SMV (sake meter value), Brix, and ABV measured on an Anton Paar density meter. These are three real, completed 2026 American Standard batches, the base sake every Colorado Sake Co. release starts from. Values are transcribed from the log (exact nutrient/enzyme dosages generalized). A few days went unsampled; on the curve those points show as a dashed line with hollow markers tagged est., interpolated between the readings on either side, and left blank in the data table below. Every fermentation varies a little, that variation is the craft.  ·  More from our Sake Insights →

Colorado Sake Co. · Sake, demystified

How rice polishing shapes sake Drag the slider. Seimaibuai is the percentage of each rice grain left after milling, the lower the number, the more is polished away.

60% seimaibuai (rice remaining) Ginjo class (≤60%)

90% · Table riceBarely polished Daiginjo · 23%Highly polished

See where we brew → Our house sake sits at exactly 60%.

60% remains

40% polished away

At 60% seimaibuai, about 40% of every rice grain is milled away before brewing, removing the outer fats and proteins that would otherwise mute the aroma.

Flavor & aroma

Fragrant and balanced, rounded melon and pear fruit with gentle acidity and a clean finish. The fruity-yet-versatile sweet spot.

Body

Medium-light, smooth

Best served

Chilled (38–46°F); versatile with food

Relative cost & effort

●●●●●

What's happening

At 60% or below, the rice qualifies as Ginjo. This is Colorado Sake Co.'s house grade.

This is Colorado Sake Co. Nearly everything we brew in Denver's RiNo Art District is Junmai Ginjo, milled to exactly 60%, including our flagship American Standard, a clean, slightly sweet melon-forward pour with gentle acidity.

Rice polishing ratio, at a glance

Seimaibuai (rice remaining)	Grade	Character
71–90%	Table sake (futsushu)	Bold, grainy, earthy; full-bodied and rustic, often served warm.
61–70%	Junmai / Honjozo class (≤70%)	Rice-forward and savory, more umami and structure, subtler fruit.
51–60%	Ginjo / Junmai Ginjo class (≤60%)	Fragrant and balanced, melon and pear fruit, clean finish. Colorado Sake Co.'s house grade (60%).
36–50%	Daiginjo class (≤50%)	Highly fragrant and refined; light, elegant, wine-like aromatics.
23–35%	Ultra-polished daiginjo	Ethereal and floral; silky, delicate, the most rice- and labor-intensive tier.

Seimaibuai (精米歩合) is the share of each rice grain that remains after milling. Polishing removes the grain's outer layers, fats, proteins and amino acids, which makes sake cleaner and more aromatic but discards more rice, raising cost. Colorado Sake Co. brews Junmai Ginjo at 60% in Denver, Colorado.

Keep exploring

Run into a word you did not know? Our Sake Field Guide is a plain-language glossary of the terms on every bottle, from junmai and ginjo to koji, nigori, genshu, and seimaibuai, written by the brewers who use them.