How Long Will Basil Keep In Olive Oil

Basil will keep in olive oil for about two to four weeks when stored properly in the refrigerator.
 
That said, how long basil will keep in olive oil really depends on several important factors like freshness, moisture, and storage conditions.
 
If you’ve ever wondered how long basil will keep in olive oil without turning into a mushy mess or risking food safety, you’re in the right place.
 
In this post, we’ll break down exactly how long basil will keep in olive oil, the best methods to extend its life, and the crucial safety rules you absolutely need to follow.
 
Let’s get into the green, garlicky goodness.
 

How Long Basil Will Keep In Olive Oil: The Core Answer

Basil will keep in olive oil for roughly two weeks if you refrigerate it, and up to four weeks if you’re very careful about dryness and acidity.
 
Fresh basil has a high moisture content, and moisture is the enemy of long-term oil storage because it creates a perfect breeding ground for bacteria.
 
So while you might think that submerging basil in olive oil preserves it forever, the reality is that how long basil will keep in olive oil is shorter than you’d hope without extra steps.
 
The biggest risk is botulism, a rare but serious illness caused by a toxin that thrives in low-oxygen, moist environments.
 
That’s why you need to pay attention to how long basil will keep in olive oil and follow safety guidelines to the letter.
 

1. Refrigerated Basil In Olive Oil Lasts 2–4 Weeks

When you put fresh basil in olive oil and store it in the fridge, you can expect it to stay safe for about two weeks.
 
If the basil leaves are completely dry and you’ve added a bit of acid like lemon juice or vinegar, you might stretch that to four weeks.
 
The cold temperature slows down bacterial growth, which is why refrigeration is non-negotiable for any batch.
 
Never leave basil in olive oil at room temperature because that dramatically shortens how long basil will keep in olive oil to just a few days.
 

2. Frozen Basil In Olive Oil Lasts 6 Months Or More

If you want to know how long basil will keep in olive oil for long-term storage, the freezer is your best friend.
 
Freezing basil in olive oil can preserve it for six months or even a full year without losing much flavor.
 
The trick is to chop the basil, mix it with olive oil, and spoon it into ice cube trays.
 
Once frozen, pop the cubes into a zip-top bag and you’ll have ready-to-use portions for soups, sauces, and pastas.
 
In this case, how long basil will keep in olive oil is no longer a concern because the freezing halts nearly all spoilage.
 

3. Dried Basil In Olive Oil Lasts Several Months

Using dried basil instead of fresh changes the game entirely when it comes to how long basil will keep in olive oil.
 
Dried basil has almost no moisture, so it won’t create the same bacterial risk as fresh leaves.
 
A jar of dried basil in olive oil can sit in your pantry for several months and remain perfectly safe.
 
However, the flavor won’t be as vibrant as fresh basil, so weigh your priorities before choosing this route.
 

Factors That Affect How Long Basil Will Keep In Olive Oil

You can’t talk about how long basil will keep in olive oil without mentioning the variables that either extend or ruin your batch.
 
Here’s what you need to control to maximize shelf life.
 

1. Moisture Is Your Biggest Enemy

Fresh basil leaves carry water on their surface, even after a quick rinse.
 
That water gets trapped in the olive oil, and trapped water means bacteria can thrive.
 
To improve how long basil will keep in olive oil, wash the leaves and then pat them completely dry with a towel.
 
Better yet, let them air-dry for a couple of hours before you even chop them.
 

2. Acid Helps Preserve The Mixture

Adding a splash of lemon juice or white vinegar to your basil and olive oil mixture drops the pH level.
 
Lower pH makes it harder for bacteria to multiply, which directly extends how long basil will keep in olive oil.
 
You only need about one tablespoon of acid per cup of olive oil to make a difference.
 
The flavor boost is a bonus, since the acid brightens the basil’s natural sweetness.
 

3. The Type Of Olive Oil Matters Too

Extra virgin olive oil has a lower acidity and more antioxidants than regular olive oil.
 
Those antioxidants can help slow down the oxidation process, which is part of why basil might keep longer in higher-quality oil.
 
Just don’t rely on the oil alone, since the basil’s moisture is still the main risk.
 

How To Store Basil In Olive Oil Safely

Now that you know how long basil will keep in olive oil, let’s talk about the best way to store it so you actually reach those timelines.
 
Follow these steps for a batch that’s both delicious and safe.
 

1. Clean And Dry The Basil Thoroughly

Start by picking the leaves off the stems and discarding any bruised or yellowing ones.
 
Rinse the leaves under cold water and then dry them in a salad spinner.
 
After that, lay them out on a paper towel and pat the tops dry.
 
Remember, less moisture equals a longer answer to how long basil will keep in olive oil.
 

2. Chop And Mix With Olive Oil And Acid

Roughly chop the basil leaves to release their aromatic oils.
 
In a bowl, combine the chopped basil with enough olive oil to fully cover it, then stir in your lemon juice or vinegar.
 
Transfer the mixture to a clean, sterilized glass jar with a tight-fitting lid.
 
Make sure the basil is completely submerged under the oil to prevent any exposure to air.
 

3. Refrigerate And Use Within Two Weeks

Place the jar in the back of your refrigerator where the temperature is most consistent.
 
If you follow the acid tip and keep everything dry, you might get a full month.
 
Always use a clean, dry spoon when scooping out the mixture to avoid introducing new bacteria.
 
If you see any bubbles, cloudiness, or an off smell, throw it out immediately.
 

Can You Keep Basil In Olive Oil At Room Temperature?

You might be tempted to keep that pretty jar of basil in olive oil on your counter for display.
 
But how long basil will keep in olive oil at room temperature is alarmingly short, just a few days at best.
 
Worse than spoilage, room-temperature storage is exactly the condition that allows botulism spores to produce their dangerous toxin.
 
Commercial producers can safely sell basil in olive oil at room temperature because they use specialized processing and acidification.
 
You can’t replicate that safely at home, so always refrigerate your homemade version.
 

So, How Long Will Basil Keep In Olive Oil?

Basil will keep in olive oil for about two to four weeks in the refrigerator, and up to a year in the freezer.
 
The exact duration depends on how dry your basil is, whether you added acid, and how consistently cold your fridge stays.
 
For the absolute safest and longest-lasting option, skip the fridge and go straight to freezing basil in olive oil.
 
We hope this guide answered how long basil will keep in olive oil and gave you the confidence to preserve your harvest.
 
Now go grab that fresh basil and make a batch that’ll elevate your cooking for weeks to come.