Washington State is full of many magnificent natural wonders including some spectacularly blue water. However, you can’t find it just anywhere, no, you have to go to the heart of the North Cascades. There you’ll find Diablo Lake, one of Washington’s most colorful bodies of water.

Lake Diablo turns a brilliant turquoise blue color in the summer months making it a great warm-weather attraction. According to the National Park Service, its hue comes from “suspended fine rock particles refracting sunlight.” The rock particles or glacial flour, enter the lake when rock from the surrounding mountains is eroded by ice and flows into the water through glacial streams.

Recent Posts:
10 of the best lake hikes you can do in Washington this summer
You can explore an abandoned army base at this Washington State Park

What’s more, now is one of the best times to see it. The lake’s color is most vibrant on sunny days in July, August, and September when seasonal glacial melt occurs. Not only are the colors vibrant during the summer months but it’s also the perfect time to explore all of the hiking options in the North Cascades.

So what are you waiting for? All you need to visit Diablo Lake is head to North Cascades National Park. You don’t even have to pay to enter! That being said if you are looking to camp you may need to purchase specific camping passes and/or permits. You can learn more at the National Park Service website.