MustDo Trip Climb the Diamond Longs Peak ColoradoWeather on Longs Peak may be changeable. Conditions on Longs Mountain can vary dramatically. It can be essential to check the weather forecast and be equipped for any climate conditions before Longs Mountain. The is famous for its sudden weather shifts and risky weather events. Choosing the suitable attire in multiple layers and bringing spare gear like precipitation coats, caps, and mittens is crucial to be protected from the elements.