Driving the Richardson Highway between Delta Junction and Summit Lake, you can’t help but notice the color of the mountains. Instead of the usual gray or green, they glow deep red, orange, and gold especially when the sun hits them just right. This is Rainbow Ridge, one of Alaska’s most striking stretches of road, and a favorite among locals and travelers alike.

A Landscape Painted by Time

The fiery tones of Rainbow Ridge and the nearby Red Rock Canyon are the result of ancient volcanic and sedimentary layers rich in iron. Over the course of many years, those minerals oxidized—essentially rusting—to create the vivid reds and oranges seen today. Combined with streaks of green vegetation and patches of lingering snow, the mountains look like they’ve been painted by hand.

In the late afternoon or evening light, the colors come alive. The reds deepen, the shadows stretch, and the landscape feels otherworldly. It’s no wonder this area is one of the most photographed and admired scenes along the Richardson Highway.

Where to See It

You’ll find the most vivid views of Rainbow Ridge along the Richardson Highway just North of Summit Lake, about halfway between Delta Junction and Paxson. The highway winds along the base of the ridge, offering sweeping views of the red slopes and easy pullouts to stop and take it all in.

To the west, Fielding Lake mirrors the colorful peaks in its still alpine waters. To the east, narrow canyons like Red Rock Canyon cut through the ridges, revealing layers of stone that range from soft pink to deep crimson.

A Place of Contrast

Rainbow Ridge perfectly captures the wild contrast of Alaska’s Interior, vibrant color in a land known for ice and tundra. In summer, wildflowers bloom at the base of the slopes, while in autumn, fireweed and tundra plants turn scarlet, echoing the hues of the rock above. Even in winter, when the mountains are dusted with snow, faint reds still shine through.

Explore Alaska’s Hidden Colors with Denali Backroads

Whether you’re driving the Richardson Highway toward the Denali Highway junction or making your way south toward Valdez, the stretch between Delta Junction and Summit Lake is a must-see. It’s a reminder that Alaska isn’t just white, green, and blue it’s red, gold, and every color in between.

Plan your Denali Backroads adventure today, and discover Rainbow Ridge for yourself where Alaska’s mountains meet the colors of the earth.