Amphibians nocturnal

Northern Red-legged Frog

Rana aurora

A secretive gem of the Pacific Northwest, the Northern Red-legged Frog is a master of camouflage known for its striking crimson legs and quiet, forest-dwelling lifestyle.

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Quick Identification

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Size

5 to 13 cm (2 to 5.25 inches) from snout to vent; females are significantly larger than males.

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Colors

Backs are olive to reddish-brown with small black flecks; the underside of the hind legs and lower belly feature a translucent, bright red wash; a dark 'mask' sits behind the eye.

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Key Features

Distinctive dark mask behind the eye with a light-colored jaw stripe
Prominent skin ridges (dorsolateral folds) extending from the eye to the lower back
Deep red coloration on the undersides of the hind legs
Smooth, moist skin with small black spots across the back

When You’ll See Them

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Activity pattern nocturnal

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Peak hours 8 PM - 4 AM, especially during or after light rainfall.

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Season January to April for breeding activity; active in forests through October.

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Diet A classic sit-and-wait predator, this frog eats a variety of invertebrates including beetles, caterpillars, spiders, snails, and slugs.

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Habitat Moist coniferous or deciduous forests, riparian zones, and suburban backyards with plenty of shade, leaf litter, and access to slow-moving water.

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Behavior

The Northern Red-legged Frog is a shy, cryptic resident of the Pacific Northwest. Unlike many other frogs that remain near water year-round, these amphibians are highly terrestrial. Outside of the winter breeding season, they can be found wandering quite far into moist forests and damp garden corners, relying on their mottled brown skin to disappear into the leaf litter.

When they feel threatened, these frogs utilize a unique 'freeze' defense, staying perfectly still until the very last second before launching themselves away with powerful, erratic leaps. They are remarkably cold-tolerant, often beginning their migration to breeding ponds in the dead of winter during the first heavy rains of January. Because they call from underwater, you are much more likely to see them on camera than to hear their low-pitched, stuttering croaks.

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Camera Tips

To successfully capture a Northern Red-legged Frog on your backyard camera, placement is the most critical factor. These frogs are ground-dwellers that prefer damp 'micro-climates.' Position your camera at an ultra-low angle, no more than 4 to 6 inches off the ground, and point it toward transition zones—places where a garden bed meets a lawn, or near the base of a rock wall or log pile. This low perspective ensures you can see the identifying red undersides of their legs and the distinctive mask that differentiates them from other species.

Since these frogs are primarily nocturnal and most active during the rainy season, you will need a camera with excellent infrared (IR) night vision and a very fast trigger speed. While they move slowly when foraging, they can exit the frame in a single leap if startled. If your camera has adjustable focus, set it for a close-range 'macro' distance (around 2-3 feet) to ensure the frog isn't just a blurry brown blob in the foreground. Using a high-sensitivity PIR (passive infrared) setting will help the camera detect the small heat signature of an amphibian against the cool ground.

You can 'bait' an area for these frogs by creating an inviting habitat rather than using food. Place a large, flat piece of bark or a ceramic 'toad house' in front of your camera to give them a place to hide. If the weather is dry, lightly watering the area in front of the lens just before sunset can create a localized humidity spike that draws them out of hiding. During the winter breeding migration (January–March), look for natural funnels like the space between a garden fence and a pond to place your camera for the best action shots.

Similar Species

Species that look similar or are commonly confused with Northern Red-legged Frog.

California Red-legged Frog

Found further south, this species is usually larger and has more prominent bumps or 'warts' on its back compared to the smoother Northern species.

American Bullfrog

Much larger with no ridges running down the back; they have a massive eardrum and lack the red coloration on the underside of the legs.

Cascades Frog

Identified by more distinct, ink-like black spots on the back and yellow-colored wash on the legs instead of red.

Frequently Asked Questions

Northern Red-legged Frogs are primarily nocturnal, meaning they are most active at night. They are especially likely to move around during or immediately after rain when the air is humid and the ground is damp.

The best way to attract these frogs is to provide a 'wild' corner in your garden with deep leaf litter, rotting logs, and plenty of shade. Avoiding pesticides is crucial, and installing a small, fish-free pond with native aquatic plants will provide them with a necessary breeding site.

They are insectivores that forage for small invertebrates on the forest floor. Their diet includes beetles, spiders, slugs, snails, and caterpillars, which they catch with their sticky, flip-out tongues.

Yes, they can be common in suburban areas that maintain mature trees and damp environments. However, they are sensitive to habitat fragmentation and require safe passage between their forest foraging grounds and their breeding ponds.

Northern Red-legged Frogs have skin ridges (dorsolateral folds) running down the sides of their back and a dark mask behind the eye. Bullfrogs are much larger, lack those back ridges, and have a ridge that wraps around their large, circular eardrum (tympanum).

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