The best month to camp in Big Bend National Park is typically October or November. During these months, temperatures are cooler and more comfortable, ranging from 50°F to 80°F, making it ideal for hiking and exploring the park. Additionally, these months see less rainfall and fewer crowds compared to the peak season. Spring, specifically March and April, is another good time to visit, but it's essential to be prepared for the possibility of occasional rain showers. Keep in mind that summer months can be extremely hot, with temperatures often exceeding 100°F, which can make camping and outdoor activities less enjoyable.