Boreal Chorus Frog

At a Glance

• Size: 1–1.5 inches (25–38 mm) — small enough to sit on a quarter
• Color: Variable — brown, reddish-brown, tan, olive, or gray
• Key marking: Three dark stripes running lengthwise down the back. This is the detail that matters most for identification.
• Face: A dark stripe passes through each eye from snout to side
• Build: Slender, smooth-skinned, with relatively short legs for a treefrog-family member
• Do not confuse with: The Spring Peeper (Pseudacris crucifer), whose back marking is an X-shape. The Boreal Chorus Frog's stripes run parallel — never crossed.

Think of this species as the Western counterpart to the Spring Peeper: same family, same ecological role, same outsized voice from a very small body. Where Peepers dominate the East Coast soundscape, the Boreal Chorus Frog fills that role across the mountain West.

Range in Utah

The Boreal Chorus Frog is a northern Utah resident. Its range centers on the Uinta Basin, the Wasatch Front wetlands, and montane areas along the Wyoming border. It's closely tied to standing water — look for it in marshes, pond edges, flooded fields, and wet meadows at a wide range of elevations, from valley floors up into the mountains.

This is not a species of the Colorado Plateau or southern desert reaches. If you're hiking in the Great Basin Desert or canyon country, you're outside its territory. Head north and look for water.

See our Utah frog habitats guide for a breakdown of the wetland types where this species thrives, and visit finding frogs in Utah for location tips and timing advice.

The Call — The Feature That Defines This Frog

The call of the Boreal Chorus Frog is one of the most distinctive sounds in Utah's natural world, and once you know it, you will never forget it:

Run your fingernail along the teeth of a plastic comb. That's it. That's the call.

It's a rising, raspy trill — crrreeeek — repeated steadily by males perched in vegetation at the water's edge. Individually it's charming. In a chorus of dozens or hundreds of males calling simultaneously, it becomes an almost deafening wall of sound that carries across a still spring evening for a remarkable distance.

Males call from concealed positions — tucked into grass clumps, emergent sedges, or the debris at pond margins — which is one reason this frog is so often heard but so rarely spotted. You may stand at the edge of a marsh completely surrounded by calling frogs and see not a single one.

The Boreal Chorus Frog is among Utah's most commonly heard frogs in spring. If you've ever driven past a roadside wetland in March or April and heard a wave of sound that you couldn't quite place, this species was almost certainly responsible.

Breeding & Behavior

The Boreal Chorus Frog is one of the first amphibians in Utah to breed in spring — and it takes "early" to an extreme. Males begin calling as soon as ice retreats from the edges of ponds and marshes, sometimes while snow still patches the surrounding ground. Water temperatures that would send most frogs back into dormancy are perfectly acceptable to this cold-tolerant species.

What's equally remarkable is how long the breeding season lasts. While many Utah frogs complete their reproduction in a tight window of a few weeks, the Boreal Chorus Frog sustains its breeding activity over the longest span of any frog in the state — sometimes calling from late February or March well into June at higher elevations, where snowmelt ponds persist longer into the season.

Females deposit small clusters of eggs attached to submerged vegetation. Tadpoles develop relatively quickly and metamorphose into tiny froglets by midsummer. After breeding, adults disperse into surrounding upland habitats and become almost impossible to find, spending the rest of the active season foraging far from water.

Habitat

The Boreal Chorus Frog is a wetland generalist — tolerant of a wide variety of standing-water habitats as long as they hold water long enough to complete larval development. Prime habitats include:

• Emergent marshes with cattail and bulrush
• Seasonal ponds and snowmelt pools
• Slow-moving streams with abundant marginal vegetation
• Wet meadows and flooded pastures
• Beaver ponds and the edges of irrigation ditches

During the non-breeding season, adults move into upland areas and can be found well away from water — under rocks, logs, and leaf litter in fields and shrubby areas adjacent to wetlands. This terrestrial phase makes them genuinely difficult to survey outside of their spring calling period.

Explore Utah's frog habitats to understand what to look for in the field.

Quick ID — Telling It Apart from Other Small Utah Frogs

Small frogs can be tricky. Here's how to separate the Boreal Chorus Frog from the species you're most likely to encounter alongside it:

• vs. Pacific Treefrog (Pseudacris regilla): Very similar in size and family. The Pacific Treefrog typically has a more uniform coloration and the distinctive eye stripe, but lacks the three parallel back stripes. The Pacific Treefrog's call is the classic "ribbit" of Hollywood — quite different from the comb-scraping trill of the Chorus Frog. Ranges overlap in parts of northern Utah.
• vs. Columbia Spotted Frog (Rana luteiventris): Much larger, aquatic, and spotted. If the frog is bigger than your thumb and heavily spotted, it's likely a Columbia Spotted Frog. No stripe pattern on the back.
• vs. Woodhouse's Toad: Toads have warty skin, a parotoid gland behind the eye, and a stockier build. No chance of confusion up close.
• By call alone: The comb-trill call is unique. If you're in northern Utah in early spring and you hear it, you've found your frog — no further ID required.

Conservation Status

The Boreal Chorus Frog is currently considered a species of least concern in Utah and is one of the more abundant native frogs in its range. Its tolerance for disturbed and human-modified wetlands — including roadside ditches and agricultural ponds — gives it some resilience that many amphibians lack.

That said, wetland loss, drought, and habitat fragmentation remain genuine pressures. Like all Utah amphibians, it benefits directly from the protection of intact wetland systems. Visit our conservation overview to learn about the broader challenges facing Utah's frogs and toads.