What plant hardiness zone is Green Knoll

Green Knoll is located at Somerset County, New Jersey (NJ), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Green Knoll is 6a by the USDA scale.

Coldest zone's winter temperature is −10 … -5 °F.

Plants of 6a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 6a USDA.