Hike to the Keyhole on Longs Peak in Rocky Mountain National ParkClimate upon Longs Mountain may be unpredictable. The atop Longs Mountain could shift greatly. It is essential to keep an eye on the forecast and be ready for any kind of weather conditions hiking on Longs Mountain. The mountain is noted for its sudden weather variations as well as hazardous storms. Wearing the right clothes in layers and bringing extra gear like precipitation jackets, hats, and gloves is essential to be safe from the elements.