The most popular months to visit Crater Lake are July, August, and September. That's when the park's roads, trails, and facilties are usually fully open. May and June are months of transition in the park, as winter slowly gives way to summer.
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Firearms, bicycles, and motorized vehicles are not permitted in the backcountry. Pets are permitted on leash in developed areas only. Pets often threaten small wildlife.
Yes, visitors can swim in Crater Lake. If you're in the mood for a dip, hike along the Cleetwood Cove Trail, a short, steep path from Rim Drive down to the shoreline. You can swim out straight from the shore.
Widely known for its rich blue color and extreme clarity, which averages 102 ft (31m) deep, Crater Lake is the deepest lake in the United States. It is one of the top ten deepest in the world.