MustDo Trip Climb the Diamond Longs Peak ColoradoClimate upon Longs Mountain may be changeable. The on Longs Mountain might alter dramatically. It's crucial to check the forecast and be ready for any weather conditions before Longs Peak. The mountain is noted for its abrupt climate changes as well as risky storms. Dressing in multiple layers and carrying spare gear like rain jackets, hats, and mittens is crucial to stay protected from the elements.