description Western White Overview
The western white, Pontia occidentalis, is a butterfly in the family Pieridae native to western North America. It is generally white with dark markings, and the underside of the hindwing has strong gray or greenish veining that helps distinguish it from related whites. The species occurs in open environments such as meadows, plains, foothills, and mountain valleys, where its caterpillars feed on plants in the mustard family.
help Western White FAQ
What field mark identifies a western white?
The western white is Pontia occidentalis, and the underside of its hindwing has veins outlined in gray-green. The forewing tip and the lighter marginal markings also help separate it from related white butterflies. [Butterflies and Moths of North America](https://www.butterfliesandmoths.org/species/Pontia-occidentalis)
Where does the western white live?
Its range extends from Alaska south to central California, northern Arizona, and northern New Mexico, then east to North Dakota and central Ontario. It uses mountain slopes, hilltops, open plains, roadsides, and other open habitats. [Butterflies and Moths of North America](https://www.butterfliesandmoths.org/species/Pontia-occidentalis)
When does the western white fly?
In the far north it usually has one flight from June through July. Farther south, it can have two flights between May and August. [Butterflies and Moths of North America](https://www.butterfliesandmoths.org/species/Pontia-occidentalis)
What do western white caterpillars eat?
The caterpillars use plants in the mustard family, Brassicaceae. They often feed on flowers, buds, and fruits rather than only eating mature leaves. [Butterflies and Moths of North America](https://www.butterfliesandmoths.org/species/Pontia-occidentalis)
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