January and February typically experience the heaviest snowfall in the Sierra Nevada, due to the peak of the winter storm season.

The Sierra Nevada receives its heaviest snowfall during the winter months, especially in January and February. These months coincide with the peak of the region's storm season, when atmospheric conditions are most conducive to significant snowfall. Snow can accumulate quickly in this period, particularly at higher elevations, making it a prime time for winter sports such as skiing and snowboarding. While snow can occur as early as October and as late as April, January and February are the most consistent months for heavy snow in the Sierra Nevada.