Boreal Chorus Frog

A tan frog with black spots on a glistening moss
Boreal chorus frogs are widely distributed in Yellowstone.

NPS / Jay Fleming


Scientific Name

Pseudacris maculata


  • Adults reach 1 to 1.5 inches in length, and females are usually larger than males; newly metamorphosed juveniles are less than 1 inch long.
  • Brown, olive, tan, or green (sometimes bicolored) with a prominent black stripe on each side from the nostril through the eye and down the sides to the groin; three dark stripes down the back, often incomplete or broken into blotches.


  • Common, but seldom seen due to its small size and secretive habits.
  • Lives in moist meadows and forests near wetlands.
  • Lays eggs in loose, irregular clusters attached to submerged vegetation in quiet water.


  • Breeds in shallow temporary pools or ponds during the late spring.
  • Calls are very conspicuous, resembling the sound of a thumb running along the teeth of a comb.
  • Males call and respond, producing a loud and continuous chorus at good breeding sites, from April to early July, depending on elevation and weather.
  • Usually call in late afternoon and evening.
  • Tadpoles eat aquatic plants; adults mostly eat insects.
  • Eaten by fish, predacious aquatic insect larvae, other amphibians, garter snakes, mammals, and birds.

More Information

  • Listen to the sounds of boreal chorus frogs in our Sound Library
  • Minute Out In It: Chorus Frogs: Watch and listen to a group of male boreal chorus frogs calling in the Gibbon Meadows, while Ranger Rita Garcia reminisces about discovering them for the first time.

Contact the Park

Mailing Address:

P.O. Box 168
Yellowstone National Park, WY 82190-0168


(307) 344-7381
Recorded information. For road and weather information, please dial 307-344-2117.

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