California Red-legged Frog

Fascinating facts about the California Red-legged Frog

• Even though it’s the biggest native frog in the western United States, the California red-legged frog only reaches 4.4–14 cm (1.7–5.5 in) from snout to vent, making it a modest-sized jumper compared with its reputation. Its bright red undersides and a dark mask with a whitish border give it a striking ‘soldier’ look that helps biologists spot it in dense riparian brush.
• The frog has vanished from about 70% of its historic range, now persisting in just 256 streams across 35 California counties. That loss is most severe in the Sierra Nevada and Southern California, yet it remains common along the coast, showing how local habitat quality can make or break a species.
• A single breeding season runs from late December to early April, and males call with a series of low grunts while swimming underwater, so quiet that choruses are often missed. The endangered San Francisco garter snake relies on the frog as a key food source.
• Tadpoles can transform into froglets in as little as seven months, but they may also overwinter and take up to 13 months to metamorphose.
• Legal protection has grown dramatically: from 450,000 acres designated in 2006 to 1,600,000 acres in 2010, and recent projects have added 18 new ponds in the Tahoe National Forest and a 2,000-acre wetland restoration in Napa County.

At a glance

About the California Red-legged Frog

The California red-legged frog (Rana draytonii) commands attention with its moderate to large size, adults range from 4.4 to 14 cm (1.7–5.5 in), and a striking color palette. Its back shimmers in shades of brown, gray, olive or reddish, peppered with black flecks and irregular light-centered blotches, while a dark mask edged in whitish runs above the upper jaw. The lower abdomen and the undersides of the hind legs blaze a vivid red, a hallmark that gives the species its name. A pronounced dorsolateral fold stretches from eye to hip on each side, and males reveal enlarged forelimbs, thumbs and partial toe webbing, inflating vocal sacs to emit low grunts during the breeding season. Juveniles sport more pronounced dorsal spotting and may show yellow instead of red on the hind-leg undersides. These amphibians cling to dense, shrubby riparian zones and still or slow-moving water bodies across California’s northern and southern Coast Ranges, the Sierra Nevada foothills, and isolated sites such as the Santa Rosa Plateau and Upper Las Virgenes Canyon. They favor tall emergent plants like cattails for shelter and egg laying, yet they also wander upland habitats for basking and foraging. Their diet is opportunistic, earthworms, beetles, flies and other winged insects dominate, though they have been observed preying on juvenile snakes, small mammals, other frogs and tadpoles. A surprising trait revealed only recently is the flexibility of their larval development: tadpoles may metamorphose in about seven months or overwinter for up to 13 months, a nuance that reshapes management of their aquatic habitats.

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