Attributes of Pontia occidentalis

Western White
Pontia occidentalis (Reakirt, 1866)

Family: Pieridae
Subfamily: Pierinae
Identification: Upperside of forewing has marginal markings that are lighter than the submarginal stripe. Below, forewing tip and hindwing have veins outlined with gray-green. Short-day spring and fall forms have more prominent markings.
Wing Span: 1 1/2 - 2 1/8 inches (3.8 - 5.3 cm).
Life History: Males patrol hilltops and ridges for receptive females. Females lay eggs singly on host plants. Caterpillars will feed on leaves but prefer buds, flowers, and fruits. Chrysalids hibernate.
Flight: One flight from June-July in far north; two flights from May-August in the south.
Caterpillar Hosts: Flowers and fruits of various members of the mustard (Brassicaceae) family.
Adult Food: Flower nectar.
Habitat: Mountain peaks, slopes, hilltops, railroad yards, open plains, roadsides.
Range: Alaska south to central California, northern Arizona and northern New Mexico; east to North Dakota and central Ontario.
Conservation: Not usually required.
NCGR: G5 - Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery.
Management Needs: None noted.
Taxonomy Notes:

Images of Pontia occidentalis

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Pontia occidentalis - 182847.jpg

Pontia occidentalis - 182847.jpg

The map below displays all BAMONA data for this species and has three different data layers:
1. All records (yellow dots)   2. Recently verified records (orange dots)*   3. US county records (purple)

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*The orange dots on the map provide access to information about the 400 most recently verified sightings of this species. Sometimes, there are several records at the same location. Use the table view to access these records.

By default, the fifty most recently verified sightings are below. Sort by Observation Date to see the most recent sightings, or filter the sightings by region to get a regional list.

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Observation Date Submitter Region Verified Datesort icon
June 11, 2016 J_Martineau Sheridan County, Wyoming, United States January 09, 2017 Details
August 29, 2016 edwardbirding Harney County, Oregon, United States September 15, 2016 Details
August 04, 2016 Sue Orlowski Whitman County, Washington, United States August 24, 2016 Details
June 13, 2016 BCBirdman British Columbia, Canada July 19, 2016 Details
June 30, 2016 Kristie Nelson Mono County, California, United States July 04, 2016 Details
June 05, 2016 PDunwiddie Pierce County, Washington, United States June 06, 2016 Details
May 22, 2015 bobscafe British Columbia, Canada April 25, 2016 Details
April 06, 2016 sseagrave Sheridan County, Wyoming, United States April 07, 2016 Details
June 30, 2015 bobscafe British Columbia, Canada February 11, 2016 Details
July 15, 2015 bobscafe British Columbia, Canada February 11, 2016 Details
May 27, 2015 bobscafe British Columbia, Canada November 17, 2015 Details
May 27, 2015 bobscafe British Columbia, Canada November 17, 2015 Details
July 09, 2015 bobscafe British Columbia, Canada November 17, 2015 Details
July 09, 2015 bobscafe British Columbia, Canada November 17, 2015 Details
October 01, 2015 Sue Orlowski Adams County, Washington, United States October 08, 2015 Details
October 01, 2015 Sue Orlowski Adams County, Washington, United States October 08, 2015 Details
July 12, 2015 ncrosbyrd Gunnison County, Colorado, United States September 20, 2015 Details
July 04, 2015 PDunwiddie Snohomish County, Washington, United States August 27, 2015 Details
July 31, 2015 shastamax Siskiyou County, California, United States August 02, 2015 Details
July 02, 2015 Sue Orlowski Spokane County, Washington, United States July 11, 2015 Details
March 26, 2015 Sue Orlowski Grant County, Washington, United States April 13, 2015 Details
March 27, 2015 carlysummer Park County, Montana, United States April 02, 2015 Details
August 10, 2014 Indy Entomologist Yukon-Koyukuk Borough, Alaska, United States March 21, 2015 Details
June 01, 2014 carlysummer Adams County, Idaho, United States March 10, 2015 Details
August 07, 2014 davidwdroppers Skagit County, Washington, United States August 13, 2014 Details
July 12, 2014 Sue Orlowski Spokane County, Washington, United States July 24, 2014 Details
July 12, 2014 Sue Orlowski Spokane County, Washington, United States July 24, 2014 Details
July 14, 2014 JDreimiller Pierce County, Washington, United States July 22, 2014 Details
August 30, 2013 rbuist Manitoba, Canada July 20, 2014 Details
July 04, 2014 Sue Orlowski Lincoln County, Washington, United States July 14, 2014 Details
September 21, 2013 Frederike Hofstra Grand County, Colorado, United States June 22, 2014 Details
September 28, 2013 Geoff Urwin Saskatchewan, Canada June 03, 2014 Details
August 07, 2011 sandyleapt Hood River County, Oregon, United States October 09, 2013 Details
June 29, 2013 wsensei Harney County, Oregon, United States October 09, 2013 Details
September 25, 2013 sagebird52 Albany County, Wyoming, United States September 30, 2013 Details
August 07, 2013 randimal Pierce County, Washington, United States August 10, 2013 Details
March 29, 2013 plex1ppus Lincoln County, Washington, United States April 01, 2013 Details
July 11, 1982 legacy.reporter (K Hansen-S. Mattoon) Elko County, Nevada, United States December 01, 2012 Details
June 03, 1985 legacy.reporter (Floyd & June Preston) Lander County, Nevada, United States December 01, 2012 Details
July 25, 1988 legacy.reporter (George T. Austin) Lincoln County, Nevada, United States December 01, 2012 Details
July 26, 1988 legacy.reporter (George T. Austin) Lincoln County, Nevada, United States December 01, 2012 Details
August 11, 2012 plex1ppus Okanogan County, Washington, United States September 22, 2012 Details
September 01, 2012 PDunwiddie Pierce County, Washington, United States September 03, 2012 Details
July 22, 2012 MamaMac Alberta, Canada August 26, 2012 Details
July 14, 2012 PDunwiddie Kittitas County, Washington, United States July 17, 2012 Details
July 01, 2012 PDunwiddie Kittitas County, Washington, United States July 02, 2012 Details
June 26, 2012 Ken Davenport (Ken Davenport) Mono County, California, United States January 01, 2012 Details
July 09, 1976 legacy.reporter (Kilian Roever; J & S Werner) Coconino County, Arizona, United States January 01, 2012 Details
July 01, 1977 legacy.reporter (Ron Wielgus) Coconino County, Arizona, United States January 01, 2012 Details
August 14, 2011 J_Martineau Johnson County, Wyoming, United States December 02, 2011 Details