What is the best time of year to visit Channel Islands National Park? Since the park is located in 'sunny' southern California, it may seem that the obvious answer is 'any time of year.' And, true, you can visit throughout the entire year. But, believe it or not, we actually do have seasons here. While the seasonal changes are nothing like one would find in Minnesota, there are differences that visitors should take into consideration when visiting the park. Each season has its own character and casts a unique mood over the islands.