Oregon Spotted Frog

October 23, 2015
Heidi Rockney and Karen Wu
Oregon Spotted Frog

Oregon Spotted Frog. Photo: Heidi Rockney.

Name: Oregon Spotted Frog (Rana pretiosa)
Order: Frogs (Anura)
Family: True Frogs (Ranidae)

What they look like

  • 4-10cm
  • Bumpy light brown or olive green skin with dark spots which are lighter in color in the center
  • Belly, sides and the underside of short hind legs are red
  • Light jaw stripe that can sometimes be very faint
  • Have skin folds along sides of back and eyes are slightly upturned
  • Very similar in appearance to Rana luteiventris

Where they live

  • View a map of where they live
  • Very rare and currently with populations at Black river and Conboy Lake
  • Prefer marshes, wetlands, ponds, or other slow moving quiet water


  • Breeding season is February-July depending on temperature and elevation
  • Lay eggs in quiet, slow water

Cool Biology Facts

  • Hibernates in winter up to a foot in the mud below water!
  • Currently very threatened in Washington state, having disappeared from 70-90% of their range
  • Highly aquatic, more so than any other Pacific Northwest frog
  • Not very adaptable and do not do well with even slight changes to their environment


  • Have severe declines in Washington state and breeding programs have been set up and have had moderate success in the reintroduction of the Oregon spotted frogs in a few areas. 
  • Main threats include nonnative species, including the bullfrog and introduced fish species and habitat loss and destruction.
  • View their status on the IUCN Red List of Threatened Species.
Distribution map

Map of Oregon Spotted Frog distribution in Washington state. Learn more on the NatureMapping Foundation website.

Explore more of the Amphibians & Reptiles of Washington or check out All About Amphibians.

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