How long does simple syrup last?

Simple syrup, also known as sugar syrup, is a solution made from equal parts granulated white sugar and water. It’s an indispensable ingredient in cocktails, coffee drinks, and desserts. But how long does simple syrup last once made? Here’s a quick overview of simple syrup’s shelf life and how to tell if yours has gone bad.

Does Simple Syrup Go Bad?

Yes, simple syrup can go bad. Simple syrup is perishable because of the water content. Over time, the water in simple syrup can enable microbial growth like mold or bacteria. There are also chemical reactions that can cause the syrup to darken, thicken, or develop off-flavors.

How Long Does Simple Syrup Last in the Fridge?

Properly stored simple syrup will last 2-3 weeks in the refrigerator. The cold temperatures of refrigeration slow down microbial growth and chemical reactions that can spoil the syrup.

To maximize its fridge life, store simple syrup in an airtight container like a mason jar or bottle with a tight-fitting lid. This prevents outside moisture or aromas from getting in. Make sure to use clean utensils each time you open and access the syrup.

How to Tell if Simple Syrup Has Gone Bad

Here are signs that simple syrup has spoiled and should be discarded:

  • Mold growth – Look for fuzzy mold on the surface of the syrup. Mold often appears white or greenish.
  • Strange odor – Fresh simple syrup smells lightly sweet. If it develops an off smell like sourness or rotting, it’s gone bad.
  • Change in texture – Properly stored simple syrup maintains a thin, pourable consistency. If it becomes thick like honey or develops syrupy globs, it’s gone bad.
  • Change in color – Simple syrup may darken over time but shouldn’t look excessively brown. An extreme color change signals deterioration.

Does Refrigeration Extend Simple Syrup’s Shelf Life?

Yes, refrigeration can extend the shelf life of simple syrup significantly. The ideal storage temperature for simple syrup is 38-40°F. At this chilled temperature range, simple syrup can last 2-3 weeks.

Proper refrigeration slows down microbial growth. The cool environment helps limit chemical reactions that can cause simple syrup to spoil faster at room temperature.

Refrigeration can keep simple syrup fresh for up to 3-4 times longer compared to storing it at room temperature. So refrigeration is highly recommended for simple syrup storage.

Can You Freeze Simple Syrup?

Yes, simple syrup can be frozen for longer term storage. Properly frozen simple syrup can last 4-6 months in the freezer.

To freeze simple syrup:

  1. Make sure any containers used are freezer-safe. Glass jars or plastic bottles designed for freezing work best.
  2. Leave at least 1 inch of headspace in containers before sealing to allow for expansion.
  3. Cool the simple syrup down completely before freezing.
  4. For best quality, use frozen simple syrup within 4-6 months.

Thaw frozen simple syrup overnight in the refrigerator before using. Give it a good stir once thawed and liquid again.

Freezing prevents microbial growth and slows chemical reactions so simple syrup stays preserved longer. The freezer temperature should be 0°F or below for best results.

Does Simple Syrup Go Bad at Room Temperature?

Yes, simple syrup will go bad much quicker if left at room temperature compared to being refrigerated. It can last up to 2 weeks in the fridge but may only last 3-5 days at room temperature.

The reason simple syrup has a shorter shelf life at room temperature is:

  • Warmer temperatures allow for faster microbial growth.
  • Chemical reactions that cause simple syrup to deteriorate happen quicker.
  • More moisture can evaporate, causing the syrup to thicken up.

To maximize freshness, simple syrup should always be refrigerated after making. Store any leftovers immediately in an airtight container in the fridge. Discard room temperature simple syrup after 5 days.

How to Store Simple Syrup Properly

Follow these tips for proper simple syrup storage:

  • Use airtight containers: Store syrup in containers with tight lids like mason jars or bottles to keep out moisture and aromas.
  • Refrigerate after use: Return syrup to the fridge right after using. Never leave it out at room temperature.
  • Clean utensils: Always use clean utensils to remove syrup to avoid introducing bacteria.
  • Check for signs of spoilage: Inspect syrup before using. Discard if moldy, smelly, or very thick.
  • Label and date: Mark syrup containers with the date made so you know how old it is.

Proper storage keeps simple syrup fresh and usable for 2-3 weeks in the refrigerator or up to 6 months in the freezer.

How Long Does Simple Syrup Last Summary

Simple Syrup Storage Method Estimated Shelf Life
Refrigerated 2-3 weeks
Frozen 4-6 months
Room temperature 3-5 days

Key Points

  • Simple syrup lasts around 2-3 weeks when properly stored in the refrigerator.
  • Signs simple syrup has gone bad are mold, strange odor, color change, and abnormal thickness.
  • Freezing extends the shelf life of simple syrup to 4-6 months.
  • Simple syrup left at room temperature will go bad within 3-5 days.
  • Always refrigerate simple syrup in an airtight container and discard if it shows signs of spoilage.


Simple syrup has a relatively short shelf life compared to sugar on its own due to its water content. Proper refrigeration provides the best storage conditions for simple syrup to maximize its freshness for 2-3 weeks. Freezing can extend its shelf life even longer to 4-6 months. Always store simple syrup in clean, sealed containers in the fridge or freezer. Discard if it smells funny, changes color or texture, or grows mold. Following proper storage guidelines allows you to enjoy simple syrup’s sweet convenience while minimizing food waste.

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