When is the best time to visit Castle Rock for camping?

The best time to visit Castle Rock for camping is in the summer, when the weather is hot and dry, and the temperatures stay warm well into September. If you plan to climb Mount St. Helens, it's best to visit in the summer or in late spring or early fall. Just be aware that you'll need a permit if you're visiting between April and October. You can also explore different options for camping near Castle Rock on Hipcamp.