How Long Do White Butterflies Live? The Full Life Cycle

Most adult white butterflies live roughly two to three weeks in the wild, though the full journey from egg to death spans considerably longer. When you include the egg, caterpillar, and pupal stages, a single generation of the common cabbage white (Pieris rapae) or its close relatives takes about five to eight weeks in warm summer conditions. That timeline stretches dramatically when overwintering enters the picture, with some pupae sitting dormant for many months before emerging the following spring.

What Counts as a “White Butterfly”

The butterflies most people call white butterflies belong to the family Pieridae, and the ones you’re likeliest to see fluttering around your garden are in the genus Pieris. The small white or cabbage white (Pieris rapae) is the most widespread, having colonized every continent except Antarctica and South America. The large white (Pieris brassicae) is common across Europe and parts of Asia and North Africa, and the green-veined white (Pieris napi) rounds out the trio you’re most likely to encounter in temperate climates. All three share broadly similar life cycles, though they differ in details like clutch size, host plant preferences, and how they handle winter. Unless otherwise noted, the lifespan figures here apply across the genus, with species-specific differences called out where they matter.

The Egg Stage

A female white butterfly lays her eggs on or near plants in the cabbage family, including broccoli, kale, collards, and wild mustards. Pieris rapae females typically lay eggs singly, dotting them one at a time across different leaves or even different plants. Pieris brassicae, by contrast, lays eggs in clusters of a few dozen. This behavioral difference matters because solitary eggs are harder for predators and parasitoid wasps to find in bulk, while clustered eggs give caterpillars safety in numbers once they hatch.

Under warm summer conditions, eggs hatch in about five to ten days. Temperature is the main driver: warmer weather speeds things up, cooler weather slows them down. The eggs are tiny, pale yellow, and ridged, usually placed on the underside of leaves where they’re somewhat sheltered from rain and direct sun. If you’re growing brassicas and spot them, you’ve found the beginning of a cycle that will soon involve a lot of leaf damage.

The Caterpillar Stage

Once hatched, the larva goes through five growth phases called instars, shedding its skin between each one. This is the stage where the butterfly does almost all of its eating and growing. Caterpillars of Pieris rapae are green with a faint yellow stripe, blending in well against cabbage leaves. Those of Pieris brassicae are more conspicuous, with black and yellow markings that advertise their mild toxicity to birds.

In the field, the final instar alone lasts five to eight days for Pieris rapae, and the entire caterpillar stage typically takes two to four weeks depending on temperature.¹ Caterpillars are essentially eating machines during this window, and their consumption and growth rates climb steadily with temperature up to about 35°C before dropping sharply. That means a caterpillar in a warm July garden develops much faster than one in a cool, cloudy spring. Caterpillars in the field rarely experience constant temperatures, though. They regularly encounter swings of 25°C or more over the course of a few days and spend most of their time at temperatures well below those that would maximize their growth rate.

This stage is also the most dangerous. A study tracking large white butterfly larvae found that when caterpillars were exposed to the full range of natural predators, total mortality during the larval stages reached about 97 percent.² Birds are the biggest killers: when researchers excluded birds from the area, about eleven times as many caterpillars survived to the pre-pupal stage. On top of predation, over 80 percent of the surviving pre-pupae in that study were parasitized by the braconid wasp Cotesia glomerata, and a small additional fraction died from bacterial infections. The odds of any individual caterpillar making it through to adulthood are, frankly, terrible.

The Pupal Stage and Overwintering

When a caterpillar is fully grown, it finds a sheltered surface, often a fence, wall, or plant stem, attaches itself with a silk pad and girdle, and transforms into a chrysalis. In summer, this pupal stage lasts roughly one to two weeks before the adult butterfly emerges. But the pupal stage is also how white butterflies survive winter, and that changes the math entirely.

White butterflies in temperate regions produce multiple generations per year, sometimes two to four depending on the climate. The final generation of the season enters diapause as pupae rather than developing straight through. Diapause is a state of suspended development triggered by shortening day length and cooling temperatures that the caterpillar experiences before pupating. The butterfly essentially overwinters as a chrysalis, waiting months for conditions to improve.

Research on the green-veined white (Pieris napi) has shown that diapause duration varies with latitude. Populations further north spend longer in diapause, and exposure to cold temperatures during winter actually helps terminate diapause more quickly when spring arrives.³ At the hormonal level, the pupa’s development is kept on hold by reduced signaling from key developmental hormones. Sensitivity to those hormones gradually shifts during diapause in a temperature-dependent way: cold winter conditions eventually restore the pupa’s ability to respond to hormonal cues and resume development, while warm temperatures do not trigger the same recovery.⁴ In practical terms, the butterfly needs a genuine winter to “know” when spring has arrived. A chrysalis that forms in September may not produce an adult until the following April or May, meaning the pupal stage alone can last six to eight months.

Work on the Japanese white butterfly Pieris melete adds another dimension. Individuals that go through diapause tend to be slightly heavier as adults than those that develop straight through without pausing, even at the same rearing temperature.⁵ The directly developing individuals compensate with faster growth rates and shorter overall development times. So the two pathways represent a genuine trade-off: speed versus size.

How Long Adults Actually Live

Once the adult butterfly emerges from its chrysalis, it has roughly two to three weeks ahead of it under typical conditions. Males tend to emerge a day or two before females and begin patrolling for mates almost immediately. Females spend much of their adult life seeking out host plants and laying eggs, and they can deposit hundreds of eggs over their lifespan if conditions are good.

Compared to some native butterfly species, the cabbage white appears to have somewhat better survival during early adulthood, experiencing weaker trade-offs among the things that determine how long it lives versus how many offspring it produces.⁶ That resilience is likely one reason the cabbage white has been so successful as an invasive species. It reproduces quickly, tolerates a wide range of conditions, and doesn’t burn out as fast as some competitors.

There is an interesting wrinkle involving learning and egg development. Research on cabbage whites found that females from families with better learning ability, specifically the ability to recognize and remember new host plant colors, tended to emerge as adults with fewer and less developed eggs.⁷ In other words, there’s a cost to being a smarter butterfly: the resources that go into a more flexible brain seem to come at the expense of initial reproductive readiness. This doesn’t directly shorten adult lifespan, but it shapes how quickly a butterfly can begin laying eggs after emergence, which matters when you only have a few weeks.

How Temperature Shapes the Entire Timeline

Temperature is the single biggest factor controlling how long each stage of the life cycle lasts and, by extension, how many generations a population squeezes into a single year. In warm southern climates, cabbage whites can produce four or even five generations between spring and autumn, with each generation cycling from egg to egg-laying adult in about five weeks. In cooler northern regions, two generations is more typical, and the whole pace of life slows down.

For caterpillars, feeding and growth rates rise continuously between about 10°C and 35°C, peak around 35°C, and then crash above that threshold.¹ That sharp drop-off above 35°C matters in the context of warming climates and heat waves: a few extra degrees of summer heat could push caterpillar environments past the optimal window and into dangerous territory.

Adults face their own thermal constraints. Pieris butterflies need a body temperature between about 29°C and 40°C just to take off and fly.⁸ Since they can’t generate enough heat internally, they rely on basking. But the way they bask is unusual among butterflies. Rather than spreading their wings flat to absorb sunlight directly, Pieris species use a technique called reflectance basking: they angle their wings to bounce solar radiation onto their body, essentially using the pale wing surfaces as mirrors. The amount of dark pigment along the wing edges fine-tunes how much heat is reflected versus absorbed, and this varies between species and between males and females within a species.⁹ On cool, overcast days, butterflies may struggle to reach flight temperature and spend more time grounded, which cuts into the time available for feeding, mating, and egg-laying during their already-short adult lives.

Urbanization adds another variable. Cities tend to be warmer than surrounding rural areas, and research has shown that for some butterfly species, that urban warmth can double larval survival rates compared to nearby rural sites.¹⁰ The response isn’t universal across species, but for warmth-loving butterflies the urban heat island can be a real advantage, effectively extending the growing season and improving development conditions.

What Kills White Butterflies Before Old Age

Very few white butterflies die of old age. The overwhelming majority are killed during the larval stage, as the predation data above makes clear. Birds, spiders, ground beetles, and other arthropod predators take an enormous toll on caterpillars. Parasitoid wasps are arguably even more consequential for population dynamics because they target late-stage larvae and pupae, meaning the butterfly has already survived the gauntlet of predators only to be consumed from within by wasp larvae.

Insecticides are another major mortality source, particularly for caterpillars living near agricultural fields. Even spray drift, the fine mist that travels downwind from a treated field, can kill first-instar larvae of the large white at distances of several meters from the sprayed area. Some insecticides, particularly synthetic pyrethroids and insect growth regulators, remain lethal to tiny caterpillars at remarkably low concentrations carried on the wind.¹¹ This matters because white butterflies lay eggs on wild brassicas growing in hedgerows and field margins, not just on crops. Drift from nearby fields can kill caterpillars on plants that weren’t even targeted.

For adults, the main threats are predation by birds and dragonflies, adverse weather (a cold snap or heavy rain can be lethal for a creature that needs warmth to fly), and simple exhaustion. Females that have laid most of their eggs often show visible wing wear and declining flight ability in their final days. Their wings don’t regenerate, so the accumulated damage from collisions with vegetation, failed predator escapes, and general use gradually degrades their ability to function.

Putting the Full Timeline Together

To give you a rough calendar for a summer-generation cabbage white in a temperate climate: eggs are laid and hatch in about a week. The caterpillar feeds and grows for two to four weeks, passing through five instars. It then pupates, spending one to two weeks as a chrysalis. The adult emerges and lives another two to three weeks, during which it mates and lays eggs for the next generation. That’s roughly five to ten weeks from egg to natural death, depending on temperature. For the final generation of the year, the pupal stage stretches to encompass the entire winter, so the total lifespan from egg to adult death can approach nine or ten months, most of it spent in suspended animation inside a chrysalis.

It’s worth noting that these figures come with a lot of natural variation. Two caterpillars hatching a week apart in the same garden can experience very different temperature regimes and grow at noticeably different rates. Individual adult lifespans range from under a week (for a butterfly that gets picked off by a bird on day two) to potentially a month under ideal conditions with low predation pressure. The two-to-three-week figure for adults is a central tendency, not a fixed rule.

Why Lifespan Estimates Are Harder Than They Sound

If you’ve looked up butterfly lifespans and found conflicting numbers, there’s a reason. Estimating how long a wild butterfly lives is genuinely difficult. The standard method, mark-release-recapture, involves catching butterflies, marking their wings with a small dot of paint or a tiny tag, releasing them, and then trying to recapture or re-sight them on later visits. The time between first capture and last recapture gives a minimum lifespan estimate.

The problem is that these estimates are sensitive to how often researchers visit, how many locations they check, and how large an area they cover. Simulation-based research has shown that mark-release-recapture methods can systematically underestimate true population parameters when sampling effort is insufficient, and that subjective decisions about sampling protocol account for a large share of the variation in the resulting estimates.¹² A butterfly that flies outside the study area between visits, or simply isn’t recaptured because it’s sitting on a leaf when the researcher walks by, looks like it died when it’s still alive. Lab studies get around this by keeping butterflies in captivity and recording exact death dates, but those lifespans may not reflect reality either, since captive butterflies don’t face predation, weather, or the energetic costs of long-distance flight.

Why White Butterflies Seem to Be Everywhere

Given that the vast majority of eggs and caterpillars never make it to adulthood, it can seem paradoxical that cabbage whites are among the most common butterflies in the world. The answer is sheer reproductive output combined with fast generation times. A single female can lay several hundred eggs in her two or three weeks of adult life, and with multiple generations per year, even a tiny survival rate produces enormous numbers of adults by late summer. The cabbage white’s willingness to eat a wide range of brassica crops and wild mustards, paired with its tolerance of a broad temperature range, means it thrives in agricultural landscapes and suburban gardens that many other butterfly species cannot exploit as effectively.

Their success is also partly about what they don’t invest in. White butterflies are not long-lived, elaborately ornamented, or particularly choosy about habitat quality. They invest in speed, fecundity, and flexibility instead. That strategy won’t produce butterflies that live for months as adults, but it will produce butterflies that show up reliably every spring and keep appearing in waves until autumn shuts things down. For a gardener trying to protect a cabbage crop, that relentless succession of new generations is the real challenge, not any single butterfly’s lifespan.