What plant hardiness zone is Grantham

Grantham is located at Sullivan County, New Hampshire (NH), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Grantham is 5a by the USDA scale.

Coldest zone's winter temperature is −20 … -15 °F.

Plants of 5a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 5a USDA.