Quick Answer
Fudge made with condensed milk does need to be refrigerated after it has set up and firmed. The high sugar content of condensed milk inhibits microbial growth, but after adding other ingredients like chocolate, nuts, etc., the fudge is no longer shelf-stable and requires refrigeration. Refrigeration will help the fudge last longer, maintain texture, and prevent any mold growth.
Why Fudge Made with Condensed Milk Requires Refrigeration
Ingredients Alter Shelf-Stability
Condensed milk on its own is shelf-stable due to its high sugar content. The combination of sugar and the removal of water creates an environment where bacteria, yeast, and mold cannot easily grow. However, when making fudge, other ingredients like chocolate, butter, nuts, and vanillas are added. These ingredients lower the sugar concentration and introduce sources of fat and protein, making the fudge hospitable to microbial growth if left unrefrigerated. Refrigeration is necessary to prevent spoilage.
Texture and Firmness
Part of the appeal of fudge is its dense, creamy texture. If left unrefrigerated, the fat from ingredients like butter or chocolate can soften and cause the fudge to become oily or lose its shape. Refrigerating helps maintain firmness. Likewise, humidity or temperature fluctuations can cause condensed milk fudge to become sticky, grainy, or to start “weeping” droplets of moisture. Refrigeration creates an evenly cool environment for the best texture.
Preventing Mold Growth
The high sugar content of condensed milk fudge inhibits most microbial growth, but does not make the fudge completely shelf-stable. If left unrefrigerated for too long, even high-sugar dense fudge can develop spots of mold. These appear as fuzzy patches of green, black, or white. Refrigeration significantly slows mold growth. For longest shelf life, condensed milk fudge should be stored in an airtight container in the refrigerator.
Refrigeration Guidelines
To properly refrigerate condensed milk fudge:
- Allow fudge to fully set and firm at room temperature first, about 6-8 hours.
- Place completely cooled fudge in an airtight container. Glass or plastic work best.
- Refrigerate for at least 2 hours before serving.
- Keep refrigerated until ready to serve. Fudge can be stored this way for up to 1 month.
- Allow refrigerated fudge to come to room temperature before serving for best texture.
- Do not freeze, as this can cause graininess and weeping.
Signs Your Condensed Milk Fudge Has Gone Bad
Appearance
– Mold growth (fuzzy spots of white, green, black)
– Weeping droplets of moisture
– Oil separation, fudge looks wet/greasy
– Crystallization (gritty, sugary layer on surface)
Texture
– Very soft, loose, creamy
– Grainy or crystallized feel
– Dried out, stiff, or hard
Smell
– Sour
– Moldy
– “Off” odors
Frequently Asked Questions
Does unopened condensed milk need refrigeration?
No, unopened shelf-stable condensed milk can be stored at room temperature. Refrigeration is only needed once opened.
Can you make condensed milk fudge without refrigerating it?
It is not recommended. Without refrigeration, the fudge will have a very short shelf life before developing mold or texture issues. Proper storage requires refrigeration.
Can you freeze condensed milk fudge?
Freezing is not recommended. The temperature fluctuations of freezing and thawing can cause graininess, weeping, and an undesirable texture. Refrigeration is better for storing condensed milk fudge.
How long does condensed milk fudge last in the fridge?
Properly stored in an airtight container, condensed milk fudge will last 3-4 weeks in the refrigerator. Quality remains best within 1-2 weeks. After a month, it’s best to discard.
Why does my condensed milk fudge get grainy?
Graininess is typically caused by sugar recrystallization. Fluctuating temperatures, freezing, or aging can cause this. Storing fudge in a stable refrigerated environment prevents grainy texture.
Conclusion
Condensed milk gives fudge a signature creamy, dense texture. But unlike unopened condensed milk, fudge made with condensed milk is not shelf-stable and requires refrigeration. The added ingredients introduce sources of fat and protein that can go rancid if left unrefrigerated. Refrigerating helps inhibit microbial growth as well as maintain the ideal firm, creamy texture. For best quality and safety, always store condensed milk fudge in an airtight container in the refrigerator after setting. Properly refrigerated, the fudge will keep for up to 1 month.