Key lime
Citrus × aurantiifolia · Rutaceae · also known as Mexican lime, West Indian lime, Bartender's lime, Dayap
A small, thin-skinned, intensely aromatic lime with more floral tartness than the common Persian lime — the true lime of Key lime pie, Mexican cooking, and the classic daiquiri.
At a glance
- Taste
- Sharper, more floral, and more complex than a Persian lime, with thin skin, many seeds, and a heady aroma; the juice is prized for perfume as much as acidity.
- Origin
- Southeast Asia; carried by traders to the Americas, naturalized in the Caribbean and Mexico
- Grown in
- Mexico, United States, Philippines, Egypt, India
- Peak season
- Summer, Autumn
- Notable varieties
- Standard Mexican/Key type
Sensory & practical profile
Taste fingerprint
- Sweetness
- Tartness
- Aroma
- Juiciness
- Firmness
Approximate, at peak ripeness · 0–5
- Ripe when
- Fully ripe when the skin turns from deep green to pale yellow-green and the aroma peaks; green fruit is more acidic and perfectly usable.
- How to eat
- Halve and squeeze — the reward is aroma, not size; save the fragrant juice for pie, ceviche, and cocktails, and grate the zest.
- Typical price
- Budget
The Florida Keys gave key lime pie its name, but a 1926 hurricane destroyed the region's lime groves — so nearly every "key lime" in an American kitchen today is actually a Mexican-grown fruit.
When it's in season, by region
| Region | Peak months |
|---|---|
| North America | Jun–Oct (Mexico) with fruit much of the year in the tropics |
How to select & store
Picking a ripe one
Choose small, thin-skinned fruit heavy for its size, yellowing slightly when fully ripe (fully green is fine and more acidic). A strong lime perfume when scratched is the best sign.
Storing it
About a week at room temperature, up to two weeks refrigerated. Juice and freeze in cubes — key limes are too small and seedy to juice one at a time on demand.
Practical uses
🍽️ Culinary
- Key lime pie — the definitive American use, its floral juice set with condensed milk
- Mexican cooking — over tacos, in ceviche, aguas frescas, and salsas
- Daiquiris, margaritas, and gimlets, where its aroma outshines Persian lime
- Dayap zest in Filipino desserts and dishes
🌿 Health & traditional
- Vitamin-C-rich; historically carried on ships against scurvy
🎎 Cultural
- Namesake of the Florida Keys, where it once grew commercially before hurricanes wiped out the groves
- Most "key limes" sold in the US today are grown in Mexico
Eating key lime: what to know
What regular consumption looks like
Key lime is mostly water with natural sugars, a little fibre, and assorted micronutrients — a hydrating everyday addition to your overall fruit intake rather than a standout for any one nutrient.
Sensible amounts
A typical fruit serving is roughly a handful, one medium fruit, or about 80 g, and two or more varied fruit servings a day is a sensible everyday pattern.
Evidence & conditions
As a whole fruit, Key lime contributes fibre, vitamins, and beneficial plant compounds, but it has not been shown to treat or prevent any specific condition — so it is best enjoyed as part of a healthy diet rather than as a remedy.
Key lime: frequently asked questions
What does key lime taste like?
Sharper, more floral, and more complex than a Persian lime, with thin skin, many seeds, and a heady aroma; the juice is prized for perfume as much as acidity.
When is key lime in season?
Key lime is typically in season North America (Jun–Oct (Mexico) with fruit much of the year in the tropics). Peak months shift between the northern and southern hemispheres.
How do you eat key lime?
Halve and squeeze — the reward is aroma, not size; save the fragrant juice for pie, ceviche, and cocktails, and grate the zest.
How do you know when key lime is ripe?
Fully ripe when the skin turns from deep green to pale yellow-green and the aroma peaks; green fruit is more acidic and perfectly usable.
Is key lime good for you?
Key lime is mostly water with natural sugars, a little fibre, and assorted micronutrients — a hydrating everyday addition to your overall fruit intake rather than a standout for any one nutrient.
How much key lime should you eat?
A typical fruit serving is roughly a handful, one medium fruit, or about 80 g, and two or more varied fruit servings a day is a sensible everyday pattern.
To most of the world a lime is a lime, but bakers and bartenders know better. The key lime — small, thin-skinned, seedy, and wildly aromatic — is a different fruit from the big seedless Persian lime at the supermarket, with sharper acidity and a floral complexity that no substitute quite matches.
The pie, the pour, and the plate
Its most famous role is key lime pie, where the fragrant juice is set with sweetened condensed milk into something greater than sweet-and-sour. But its home turf is broader: Mexican kitchens squeeze it over tacos and into ceviche and aguas frescas; bartenders reach for it in daiquiris and gimlets; and in the Philippines the same fruit, dayap, perfumes desserts. The name honors the Florida Keys, where it grew commercially until a 1926 hurricane destroyed the groves — which is why almost every “key lime” in an American kitchen today is really grown in Mexico. For the Filipino everyday sour citrus, see calamansi.
