What plant hardiness zone is Breckenridge Ski Area

Breckenridge Ski Area is located at Summit County, Colorado (CO), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Breckenridge Ski Area is 4b by the USDA scale.

Coldest zone's winter temperature is −25 … -20 °F.

Plants of 4b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 4b USDA.

Breckenridge Ski Resort @ wikipedia.