Columbia Spotted Frog

At a Glance

• Size: Medium — adults typically 1.5 to 3.5 inches snout-to-vent
• Dorsal color: Gray, brown, olive, or green with a field of small, irregular dark spots on the back and sides
• Underside: The giveaway — vivid red to salmon-pink on the belly and the undersides of the hind legs; no other Utah frog shows this coloration
• Eyes: Noticeably upturned, giving the face a slightly upward-looking expression that distinguishes it from the similar Oregon spotted frog
• Skin: Slightly granular; a pale dorsolateral fold runs from eye to hip
• Call: A rapid series of low, duck-like clucking notes — not the resonant trill you might expect; choruses can be subtle and easy to walk past

In the field, the red-orange belly flash when a frog kicks away from shore is the single most reliable identifier. If you catch a glimpse of it, you've almost certainly found a Columbia spotted frog.

Range in Utah

The Columbia spotted frog's broader range runs from Alaska and British Columbia south through Washington, Idaho, Wyoming, and Nevada into Utah — one of the southernmost edges of its distribution. That southern-edge status matters: Utah's populations are geographically isolated, genetically distinct, and under disproportionate pressure.

Within Utah, three clusters of populations define the species' presence:

• Heber Valley and the Provo River corridor — the largest, best-protected population in the state, and the anchor of statewide conservation efforts
• Wasatch Front foothill streams and springs — smaller, more fragmented, and more vulnerable to suburban encroachment and water diversion
• West Desert spring systems — isolated desert populations dependent on artesian and seep habitats; some of these have not been surveyed in years

Breeding typically begins in mid-March in Utah, often while ice still edges the shallows. Monitored sites in Heber Valley cluster around 4,577 feet in elevation — high enough to experience significant snowmelt pulses that drive the frog's reproductive timing.

Habitat & Behavior

The Columbia spotted frog is a wetland obligate — it does not stray far from permanent water. Lakes, ponds, slow-moving streams, beaver ponds, wet meadows, and marshes all provide suitable habitat, but the common denominator is permanence. Temporary pools that dry by midsummer are not enough; tadpoles require several months to complete metamorphosis.

Low-growing emergent vegetation — sedges, rushes, water-edge grasses — is essential for shelter and thermoregulation. These frogs are highly aquatic even by frog standards; when frightened, they dive immediately rather than hopping overland. Adults bask at the water's edge on sunny mornings, absorbing heat before retreating into cooler water during the warmest part of the day.

Their diet reflects their opportunism. Insects dominate — grasshoppers, ants, wasps, beetles, and moths are all taken — but Columbia spotted frogs also eat crustaceans, mollusks, arachnids, and occasionally algae. They are generalist predators within a highly specialized habitat.

Adults overwinter in deep pools and spring-fed channels that remain liquid beneath ice, emerging as soon as water temperatures permit in early spring. Males arrive at breeding pools before females, and breeding choruses can begin while snow is actively falling at higher elevations. Learn more about the specific wetland systems these frogs depend on at Utah Frog Habitats.

The Conservation Story

No Utah frog carries more conservation weight than this one. In 1993, the U.S. Fish & Wildlife Service reviewed a petition to list the Columbia spotted frog under the Endangered Species Act and issued a "warranted but precluded" finding — meaning the agency agreed the listing was biologically justified but lacked resources to act on it. That decision, maddening in its bureaucratic logic, had one constructive consequence: it galvanized state and federal agencies into action before a formal listing forced their hand.

The result was the 1998 Interagency Conservation Agreement, a multiparty commitment among Utah DWR, the U.S. Forest Service, BLM, and other partners to monitor populations, protect critical habitat, and address known threats. The Heber Valley population — protected within the Provo River Columbia Spotted Frog Preserve — became the cornerstone of that effort and remains the most intensively studied frog population in the state.

Threats

• Livestock grazing: Cattle congregate at water sources and can devastate the emergent vegetation these frogs depend on, compact streambanks, and directly trample egg masses in shallow breeding areas
• Water diversions and dams: Altering flow regimes can eliminate the permanent-water condition the species requires, or disconnect populations that once shared individuals seasonally
• American bullfrog competition: Introduced bullfrogs prey on Columbia spotted frogs directly and outcompete them for breeding sites; bullfrog control is now an active component of spotted frog management in several Utah areas
• Chytrid fungus (Batrachochytrium dendrobatidis): Utah DWR biologists follow strict biosecurity protocols — boot washing, equipment disinfection — at every survey site to prevent spreading this amphibian disease between populations
• Climate change: Reduced snowpack, earlier runoff, and longer dry seasons threaten the permanence of the wet meadows and spring-fed habitats the species requires. Scientists increasingly treat Columbia spotted frogs as sentinels — their population trends are early signals of how these ecosystems are responding to a warming climate

For a broader view of how these pressures affect Utah's amphibians, visit Conservation & Threats.

How to Help

Citizen science contributions are genuinely useful for this species — not as feel-good busywork, but because survey coverage across the West Desert spring populations is thin and historical records have significant gaps.

• iNaturalist: Submit any observation to the Herps of Utah project on iNaturalist. A well-documented photograph with GPS coordinates can confirm or extend the known range of an isolated population. Photograph the belly if you can do so safely — that red-orange color is the record that matters.
• Columbia Spotted Frog surveys: Utah DWR periodically recruits trained volunteers for systematic egg mass counts and population surveys in spring. Contact the Division of Wildlife Resources' native amphibian program to ask about upcoming opportunities.
• Respect biosecurity: If you visit multiple wetland sites in a season, clean your boots and gear between sites. Chytrid fungus travels in water and mud. This one habit, if widely practiced, meaningfully reduces disease transmission risk.
• Keep dogs out of breeding areas: From March through June, shoreline disturbance near egg masses causes abandonment. A leashed dog wading through a shallow breeding marsh at the wrong moment can damage an entire season's reproduction at a small site.