Although it is possible to climb Island Peak throughout the year except during the monsoon months, the best time to climb Island Peak is during spring and fall seasons. March to early June is the spring time and also the busiest climbing season of the year. September to November is the fall season when temperatures are moderate and weather tends to be clear. Climbers have attempted to climb Island Peak even in winters in the past, but the extreme cold during winter months could really be perilous for some. Summer season invites rain and does not offer great views during the climb.