Per USDA FoodKeeper
On the counterCounter
Refrigerate
once opened
In the fridgeFridge
4 weeks
at or below 40°F (4°C)
In the freezerFreezer
Not listed
no FoodKeeper figure
On the counterCounter
Use-by date
cool, dry place
In the fridgeFridge
Not needed
shelf-stable
In the freezerFreezer
Not needed
keeps without freezing
Quick answer
Yes. Dry salad dressing mix lasts 4 weeks in the fridge. After that, or sooner if stored badly, it spoils: watch for the signs below.
How to tell if dry salad dressing mix is bad
Smell
Fermented, yeasty or sour beyond the product's usual tang.
Texture
Separation that does not stir back, or a slimy layer.
Colour
Darkening or a change in colour at the top of the jar.
Mould
Any fuzz on the surface or lid — discard the jar.
Dry salad dressing mix past the expiration date
Unopened
Follow the package date. "Best-by" and "sell-by" describe quality and stock rotation, not safety; only infant formula carries a federally required use-by date.
Opened
Once opened, the printed date no longer applies. Count 4 weeks in the fridge from the day you open it.
How to keep dry salad dressing mix fresh longer
- Freezing not recommended.
- Refrigerate after opening unless the label says otherwise.
- Use a clean utensil each time; crumbs and double-dipping shorten shelf life.
More about dry salad dressing mix
FAQ
How long does it take for dry salad dressing mix to go bad?
4 weeks in the fridge, per USDA FoodKeeper.
Can dry salad dressing mix expire?
Follow the package date. "Best-by" and "sell-by" describe quality and stock rotation, not safety; only infant formula carries a federally required use-by date.
What happens if you eat bad dry salad dressing mix?
Usually an unpleasant taste rather than illness, but discard anything mouldy, rancid or smelling off.
How do you keep dry salad dressing mix from going bad?
Freezing not recommended.
Numbers on this page come from USDA FoodKeeper and FSIS guidance. Last verified November 2026. How we verify our data · Report a wrong number