Oregon Vesper Sparrow

Oregon Vesper Sparrow
Photo Credit: Simon Wray, ODFW


  • Species Common Name Oregon Vesper Sparrow
  • Species Scientific Name Pooecetes gramineus affinis
  • Federal Listing Status Species of Concern
  • State Listing Status Sensitive


Special needs

Oregon Vesper Sparrows use grasslands with high structural diversity for foraging and nesting. These typically include grassy areas interspersed with trees and shrubs and some bare ground.

Limiting factors

Declines of Oregon Vesper Sparrows have been linked to loss of grassland habitat. Infestation by invasive plants and lack of fire have degraded many remaining grasslands. Agricultural practices (timing of mowing) also threaten this species. Oregon Vesper Sparrows are susceptible to predation by cats, ground squirrels, skunks, and raccoons.

Conservation actions

Maintain or restore grassland habitat. Increase plant diversity for greater insect diversity. Control key invasive plants. In the Willamette Valley, reduce or avoid mechanical operations during nesting (mid-May to mid-July).

Key reference or plan

The Willamette Valley Landowner's Guide to Creating Habitat for Grassland Birds