What plant hardiness zone is Rio Grande City

Rio Grande City is located at Starr County, Texas (TX), USA.

Plant hardiness zone (winter frost zone or gardening zone) for Rio Grande City is 9b by the USDA scale.

Coldest zone's winter temperature is +25 … +30 °F.

Plants of 9b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 9b USDA.

Rio Grande City, Texas @ wikipedia.