March to mid-May and November are the best months for hiking in and out of Havasupai. These months are best for those who want to sit around camp and relax. There are no bugs and less crowds. However, the water is very cold. Hiking to Beaver Falls requires dry pants, canyon shoes, and neoprene socks. In addition, remember that days are very short. Therefore, pack headlamps with extra batteries and extra warm layers. Mid-May and June and September-October are the best months to hike to Beaver Falls. The hike is mostly shaded and the river is refreshing. Days are longer. July and August are more liable for closures due to high heat and flash flood potential. This is monsoon season, which is humid, with more bugs. December 1-end of February is cold. Nights can reach freezing temperatures. Hiking in and near the water to Beaver Falls is cold. The upside is that you're likely to have the canyon to yourself.