If you’ve ever stocked up on Proof Syrup for your home bar, you might wonder how to keep it fresh once opened. Proper storage matters, especially when you want to enjoy the full flavor of your cocktail syrups without worrying about spoilage. This guide explains whether Proof Syrup needs refrigeration after opening and how to make the most of your bottles.
Understanding Proof Syrup’s Shelf Stability
Proof Syrup is crafted with high-quality, natural ingredients to deliver craft-bar-quality cocktails at home. Before opening, these syrups are shelf-stable, meaning they don’t require refrigeration. This is thanks to their carefully balanced recipes, which include organic cane sugar, real citrus oils, and aromatic bitters for the Old Fashioned line, or fresh fruit and herbal components in the classic cocktail syrups.
How Proof Syrup Uses Natural Ingredients for Long-Lasting Freshness
When sealed, you can store Proof Syrup in a cool, dark place like a pantry or cupboard. This makes it convenient for home bartenders who want to keep their cocktail essentials within easy reach without worrying about fridge space.
Store Proof Syrup Easily in a Cool, Dark Pantry
The unique formulation of Proof Syrup not only enhances the flavor profile of cocktails but also contributes to its impressive shelf stability. Each ingredient is selected not only for its taste but also for its ability to preserve the syrup's overall quality. For instance, the use of organic cane sugar acts as a natural preservative, inhibiting the growth of unwanted microorganisms while providing the perfect sweetness that complements a variety of drinks. The inclusion of real citrus oils not only delivers vibrant flavors but also adds a layer of natural acidity that helps maintain freshness over time.
Airtight Bottles Keep Proof Syrup Fresh and Flavorful
The packaging of Proof Syrup plays a crucial role in its longevity. The bottles are designed to be airtight, preventing exposure to air and light, which can degrade the syrup's quality. This thoughtful design ensures that each pour delivers the same rich flavor as the first, allowing you to craft your favorite cocktails with confidence. Whether you’re mixing a refreshing mojito or a classic whiskey sour, knowing that your Proof Syrup is perfectly preserved can elevate your home bartending experience to new heights.

Why Refrigerate Proof Syrup After Opening?
Preserving Freshness and Flavor
Once you open a bottle of Proof Syrup, exposure to air and room temperature can start to affect its quality. Refrigeration slows down any natural degradation, helping maintain the syrup’s vibrant flavors and aromas. This is especially important for syrups with fresh, perishable ingredients that Proof Syrup intentionally uses to avoid preservatives.
Preventing Spoilage
Proof Syrup contains no artificial preservatives, which means it can spoil if not stored properly after opening. Refrigeration helps prevent bacterial or mold growth that could develop when the syrup is exposed to warm temperatures over time. If you notice any cloudiness, separation, or off smells, it’s a sign the syrup has gone bad and should be discarded.
How Long Can You Keep Proof Syrup After Opening?
The shelf life of Proof Syrup varies by flavor and ingredients. Here’s a quick overview:
- Old Fashioned Syrups (Traditional, Maple Bacon, Pecan, Pumpkin Spice, Black Walnut): Up to 2 years unopened, but once opened, refrigeration is recommended to keep them fresh for several months.
- Classic Cocktail Syrups (Orange, Whiskey Sour, Manhattan, Margarita, Sazerac): These often contain fresh fruit or herbal elements and have shorter shelf lives. For example, Whiskey Sour and Margarita syrups last about 8 months unopened, while Hibiscus and Pomegranate last about 3 months. Refrigeration after opening is essential to extend their usability.
Storing opened bottles in the fridge and shaking well before each use ensures you get the best taste experience every time.
Tips for Storing and Using Proof Syrup
Keep It Cool and Dark
After opening, always place your Proof Syrup bottle in the refrigerator. Avoid leaving it out on the counter for extended periods, especially in warm or sunny spots. A cool, dark environment slows down any chemical changes and preserves the syrup’s natural flavors.
Shake Well Before Use
Natural ingredients can settle or separate over time. Give your bottle a good shake before pouring to mix everything evenly. This step helps maintain the intended balance of sweetness, bitterness, and spice in your cocktails.
Watch for Signs of Expiration
Even with refrigeration, syrups won’t last forever. If you notice changes such as cloudiness, separation that doesn’t mix back in, or a sour or off smell, it’s time to toss the bottle. Using expired syrup can negatively affect your cocktail’s taste and safety.
Allergy and Ingredient Considerations
Proof Syrup processes tree nuts in its facility, so those with severe nut allergies should be cautious, even though many flavors are nut-free. The brand’s nut-free options include Traditional, Maple Bacon, Pumpkin Spice, and several fruit and herb-based syrups like Orange, Citrus Sour, and Lavender.
All Proof Syrups are gluten-free, and most are vegan except for Honey and Maple Bacon flavors. Knowing these details helps you store and use syrups safely according to your dietary needs.

Why Proof Syrup Chooses Fresh Ingredients Over Preservatives
Proof Syrup prides itself on using fresh, natural, and perishable ingredients rather than adding preservatives to extend shelf life. This commitment means you get authentic, vibrant flavors that stand out in your cocktails. The trade-off is a shorter shelf life and the need for refrigeration after opening, but the taste payoff is worth it.
This approach aligns with Proof Syrup’s roots in craft cocktailing, where quality and authenticity matter more than convenience shortcuts.
Getting the Most From Your Proof Syrup
Using Proof Syrup is all about making great cocktails quickly and easily. Just add the syrup to your spirit, stir or shake, garnish, and enjoy. Keeping your syrup refrigerated after opening ensures every drink tastes as fresh as the first.
For inspiration, Proof Syrup offers a rich recipe library featuring classics like the Old Fashioned and Manhattan, as well as creative seasonal drinks such as the Pumpkin Spice Margarita. Exploring these recipes can help you make the most of your syrups and impress guests with minimal effort.
If you’re looking to stock up or try new flavors, consider Proof Syrup’s subscription service, which offers savings and free shipping on larger orders. This way, you can always have fresh syrup on hand without worrying about expiration.
Final Thoughts on Storing Proof Syrup
Proof Syrup does not require refrigeration before opening, thanks to its shelf-stable design and natural ingredients. After opening, refrigeration is essential to maintain flavor, prevent spoilage, and extend the syrup’s usability.
Store your opened bottles in the fridge, shake well before use, and watch for any signs of expiration. By following these simple steps, you’ll enjoy fresh, delicious cocktails every time.
Ready to elevate your home bartending? Check out Proof Syrup’s wide range of flavors and start mixing craft-quality cocktails with ease.
Keep Your Cocktails Fresh with Proof Syrup
Now that you know how to store Proof Syrup for the freshest taste, it's time to stock your home bar with our premium selection. At Proof Syrup, we're committed to providing you with all-natural syrups that make home bartending simple and sophisticated. Whether you're crafting a classic Old Fashioned or experimenting with new cocktail recipes, our syrups are the secret to impressing your guests. Shop Now and discover the difference that Proof Syrup can make in your cocktails.