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GAP Analysis Predicted Distribution Map

Bullfrog  Rana catesbeiana

Species Code: RACAT

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Breeding Range Map
The green area shows the predicted habitats for breeding only.
© NatureMapping Program

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Predicted breeding range

= Core Habitat
= Marginal Habitat

bullfrog photo

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Breeding Range Map
Amphibians do not migrate as some birds and mammals, so the colored areas depict the predicted range for the Bullfrog year-round. The habitats were identified using 1991 satellite imagery, other datasets and experts throughout the state, as part of the Washington Gap Analysis Project.

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Metadata (Data about data or how the map was made)

Distribution and Habitat Requirements
This frog is an introduced species commonly found in many lakes, reservoirs and sloughs. It is highly aquatic and stays close to the borders of lakes. Its spread throughout Washington State may be due more to illegal releases and floral nursery sales for insect control that its ability to spread on its own.


The Okanogan Highlands ecoregion was the only ecoregion excluded. The Western Hemlock and Interior Douglas-fir zones were marginal. All zones beneath those two were core. Lakes, marshes, rivers and riparian areas were good habitats throughout the zones. In western Washington and the Southeast Cascades, grasslands, shrub savannas, shrublands, tree savannas, hardwood and hardwood/conifer forests, irrigated agriculture and low density development (including parks and golf courses) were considered suitable if appropriate micro habitats existed. In eastern Washington and all marginal zones, non-forested and conifer forested habitats were excluded.

Translated from the Washington Gap Analysis Amphibians and Reptiles Volume by Karen Dvornich

Webpage designed by Dave Lester.