Conservation — Threats & Recovery Efforts

Utah's native frogs and toads are remarkably resilient — they've survived in a landscape defined by drought, temperature swings, and scarce water. But a new set of pressures, arriving mostly in the last century, is pushing several species toward serious decline. The picture isn't hopeless. Active, well-coordinated conservation work is underway across the state. Here's what the challenges look like, and what's being done about them.

The Bullfrog Problem

The American bullfrog (Lithobates catesbeianus) is native to the eastern United States and was introduced throughout the West beginning in the early 1900s, primarily through the aquaculture industry and intentional stocking for sport. It is now established statewide in Utah — and it is one of the most consequential invasive species in the American West.

Bullfrogs are voracious, opportunistic predators. They eat anything they can fit in their mouths: native frogs, tadpoles, small fish, invertebrates, even birds and small mammals. They also outcompete native species for basking sites and breeding habitat. Because bullfrogs carry Batrachochytrium dendrobatidis (the chytrid fungus) with relative resistance, they can also function as a reservoir for the disease.

The northern leopard frog has been hit especially hard. Its range in Utah has contracted dramatically, and bullfrog presence is a primary driver. Removal programs at targeted sites have shown measurable recovery in native frog populations — but bullfrog management is an ongoing commitment, not a one-time fix.

Habitat Loss & Degradation

Utah's waterways have been profoundly altered over the past 150 years. Dams and reservoirs changed river hydrology, eliminated seasonal flood pulses, and inundated the low-gradient stream margins that native frogs depend on. Water diversions — especially in arid eastern and central Utah — have reduced or eliminated flow in rivers and springs entirely.

Along the Wasatch Front, rapid urbanization has consumed wetlands and riparian corridors that once connected frog populations across valleys. Isolated populations can't recolonize when habitat is destroyed; they simply disappear.

Livestock grazing in riparian areas is a particularly serious issue for the Columbia spotted frog. Cattle trample streambanks, destroy emergent vegetation, and degrade the shallow, sun-warmed water bodies that spotted frogs use for egg-laying and early larval development. Fencing riparian areas from grazing — even seasonally — produces rapid, measurable improvements in spotted frog habitat quality.

Visit the habitats guide for a closer look at what healthy frog habitat looks like across different regions of Utah.

Chytrid Fungus

Batrachochytrium dendrobatidis — universally abbreviated as Bd, or called chytrid — is a waterborne fungal pathogen responsible for the decline or extinction of amphibian species on every inhabited continent. It causes chytridiomycosis, a skin disease that disrupts the electrolyte balance frogs maintain through their permeable skin, eventually causing cardiac arrest.

Bd has been detected in Utah frogs, including Columbia spotted frogs. Not every exposure is fatal — population-level effects depend on temperature, the genetic makeup of both frog and fungal strains, and individual immune response — but it is an additional stressor on populations already under pressure from habitat loss and bullfrog competition.

The Utah Division of Wildlife Resources maintains biosecurity protocols for field biologists and survey crews, including equipment decontamination procedures designed to prevent Bd from being transported between water bodies. Researchers working with captive populations at facilities like Hogle Zoo follow similar protocols.

Species of Greatest Conservation Need

Utah's State Wildlife Action Plan identifies several native amphibians as Species of Greatest Conservation Need — meaning they receive prioritized attention for survey, management, and funding.

Plains Spadefoot & Mexican Spadefoot

Both spadefoot species are closely tied to ephemeral wetlands and summer monsoon rainfall — habitats that are inherently unpredictable and increasingly disrupted by groundwater use and land conversion in Utah's canyon country and Great Basin margins. Their boom-and-bust population dynamics make them difficult to monitor and easy to underestimate as conservation concerns.

Columbia Spotted Frog

The Columbia spotted frog holds a particularly well-documented conservation history in Utah. In 1998, a landmark interagency conservation agreement was signed among the U.S. Fish and Wildlife Service, Utah Division of Wildlife Resources, Bureau of Land Management, Bureau of Reclamation, and additional partners. The agreement formalized monitoring commitments, habitat management guidelines, and coordination mechanisms — and helped keep the Great Basin population of spotted frogs from progressing toward Endangered Species Act listing. It remains one of the more successful examples of proactive, multi-agency amphibian conservation in the region.

A Painful Absence: The Relict Leopard Frog

The relict leopard frog (Lithobates onca) was once found in the extreme southwestern corner of Utah, near the Virgin River. It has been extirpated from the state since approximately 1950. Small populations persist in Nevada, where intensive conservation work — including captive rearing and reintroduction — is ongoing. Its disappearance from Utah is a reminder of what's at stake.

What You Can Do

Citizen science isn't a consolation prize — it's genuinely useful. Survey coverage in Utah is thin, and observations from hikers, anglers, and backyard naturalists fill real gaps in distribution data.

  • iNaturalist / Herps of Utah project: Photograph and submit any frog or toad sighting. Quality photos with location data are immediately useful to researchers tracking range changes and bullfrog spread.
  • FrogWatch USA: A structured acoustic monitoring program run through the Association of Zoos and Aquariums. Volunteers learn to identify calls and submit standardized nighttime survey data from a regular monitoring site.
  • Western toad monitoring: Utah DWR, Hogle Zoo, and the Sageland Collaborative partner on western toad population monitoring across the Wasatch and Uintas. Volunteer training is offered periodically — contact Utah DWR for current opportunities.
  • Columbia spotted frog surveys: Biologists with Utah DWR coordinate volunteer survey assistance at spotted frog sites. No prior herpetology experience required — just willingness to wade through marsh vegetation on cold spring mornings.
  • Practice biosecurity: If you visit multiple water bodies while hiking or fishing, rinse boots and waders with a dilute bleach solution or let them dry completely between sites. This slows the spread of both Bd and invasive plant species.
  • Report bullfrogs: A bullfrog sighting in a new location — especially in remote or high-elevation habitat — is worth documenting and reporting to Utah DWR. Early detection allows faster management response.

The find frogs guide has practical advice on where and when to look — the same information applies whether you're surveying for science or exploring for the joy of it.