How Long Will Basil Keep In Olive Oil

Basil will keep in olive oil for about 2 to 4 months when stored properly in the refrigerator.
 
That’s the short answer, but the real question is how you prepare it and store it.
 
If you’ve ever wondered how long basil will keep in olive oil, you’re not alone because this is one of the most common questions for home cooks and gardeners alike.
 
The shelf life of basil in olive oil depends on a few key factors like freshness, acidity, temperature, and whether you’ve added any extra ingredients.
 
In this post, we’ll break down exactly how long basil will keep in olive oil, the best ways to store it, and the safety rules you need to follow.
 
Let’s dig in.
 

How Long Basil Will Keep in Olive Oil: The Safe Answer

When you’re asking how long basil will keep in olive oil, the safest answer is up to 4 months in the fridge.
 
But here’s the catch: fresh basil contains moisture, and moisture trapped in oil can create the perfect environment for botulism.
 
That’s why how long basil will keep in olive oil really depends on how you handle the basil before it hits the oil.
 
The USDA and food safety experts recommend that any herb in oil be refrigerated and used within 4 days if the herbs are fresh and not acidified.
 
However, if you take steps to dry the basil or acidify it, how long basil will keep in olive oil can extend to several months.
 
Let’s look at the different scenarios so you know exactly what to expect.
 

1. Fresh Basil in Olive Oil in the Fridge

If you chop fresh basil and submerge it in olive oil, how long basil will keep in olive oil is only about 2 to 4 days.
 
This is because the water in the fresh leaves promotes bacterial growth, and even in the fridge, it’s a race against time.
 
The oil doesn’t preserve the basil the way you might think, it simply coats it.
 
So for fresh basil in olive oil, plan to use it quickly or you risk spoilage.
 

2. Dried Basil in Olive Oil at Room Temperature

If you’re using dried basil, how long basil will keep in olive oil changes because there’s no moisture.
 
Dried basil in olive oil can last up to 6 months or even a year if stored in a cool, dark pantry.
 
The lack of water means bacteria and mold can’t thrive as easily.
 
Just make sure the basil is completely dry and the oil covers it fully to prevent oxidation.
 

3. Acidified Basil in Olive Oil

Adding an acid like lemon juice or vinegar is a game changer for how long basil will keep in olive oil.
 
The acid lowers the pH and creates an environment where botulism can’t grow.
 
With acidification, you can safely store basil in olive oil for up to 4 months in the fridge.
 
This is the method many chefs use for long-term herb preservation.
 

Why How Long Basil Keeps in Olive Oil Depends on Preparation

The biggest mistake people make is assuming oil alone preserves herbs.
 
Oil doesn’t kill bacteria, it just creates a barrier that can actually make things worse.
 
Here’s what you need to know about how long basil will keep in olive oil based on your prep method.
 

1. Blanching Basil Extends Shelf Life

If you blanch the basil in boiling water for a few seconds, then ice bath it and dry it thoroughly, how long basil will keep in olive oil increases significantly.
 
Blanching kills surface bacteria and enzymes that cause spoilage.
 
After blanching, pat the leaves bone dry before adding oil.
 
This method can push how long basil will keep in olive oil to 3 to 4 months in the freezer.
 

2. Freezing Basil in Olive Oil

When you freeze basil in olive oil, how long basil will keep in olive oil jumps to 6 months or more.
 
You can puree fresh basil with olive oil and pour it into ice cube trays.
 
Once frozen, pop the cubes into a zip-top bag and they’ll keep beautifully.
 
This changes the question from how long basil will keep in olive oil to how long it lasts frozen, and the answer is much longer.
 

3. Storing Basil Oil in the Fridge

For store-bought basil oil or homemade that’s properly acidified, how long basil will keep in olive oil in the fridge is about 4 months.
 
Always use a clean, dry spoon to scoop out the oil, never introduce water or food particles into the jar.
 
Check for off smells or cloudiness, and if it looks or smells funky, toss it.
 

Tips to Maximize How Long Basil Will Keep in Olive Oil

You want to get the most out of your basil and oil combo, so follow these tips.
 

1. Use High-Quality Olive Oil

Good extra-virgin olive oil has natural antioxidants that slow down rancidity.
 
This can improve how long basil will keep in olive oil because the oil itself lasts longer.
 
Cheap oil goes rancid faster, and once the oil turns, the basil flavor is ruined too.
 

2. Always Refrigerate If Basil Is Fresh

Never leave fresh basil in olive oil at room temperature.
 
Even for a few hours, the risk of botulism is real, which is why how long basil will keep in olive oil is so short without refrigeration.
 
Keep it cold, always.
 

3. Add Acid or Salt as a Preservative

A splash of lemon juice or a pinch of salt can change how long basil will keep in olive oil dramatically.
 
Acid and salt both inhibit bacterial growth.
 
If you’re planning to store for more than a week, this step is non-negotiable.
 

4. Store in Small, Airtight Containers

Small jars leave less air space, which means less oxygen for the oil to oxidize.
 
Oxygen is the enemy of how long basil will keep in olive oil because it causes rancidity.
 
Fill the jar to the brim and use a tight-fitting lid.
 

5. Label and Date Your Jars

You won’t remember when you made that basil oil.
 
Write the date on the lid so you know exactly how long basil has been kept in olive oil.
 
This prevents you from accidentally using oil past its prime.
 

So, How Long Will Basil Keep in Olive Oil?

Basil will keep in olive oil for up to 4 months if you store it properly in the fridge and acidify it.
 
If you skip the acid and use fresh basil, you’re looking at just 2 to 4 days.
 
And if you freeze it, you can extend how long basil will keep in olive oil to 6 months or more.
 
The key takeaway is that moisture and temperature are everything.
 
Dry your basil thoroughly, add acid if possible, keep it refrigerated, and you’ll enjoy that fresh basil flavor all season long.
 
Now that you know how long basil will keep in olive oil, you can confidently make a batch that fits your cooking timeline.
 
Whether you’re drizzling it over pasta, marinating chicken, or dipping bread, your homemade basil oil will be safe and delicious.
 
Store it smart, check it often, and never risk eating spoiled oil.
 
You’ve got this.