What plant hardiness zone is Dubuque

Dubuque is located at Dubuque County, Iowa (IA), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Dubuque 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.