What plant hardiness zone is Castel Gandolfo

Castel Gandolfo is located at Rome, Lazio, Italy.

Plant hardiness zone (winter frost zone or gardening zone) for Castel Gandolfo is 9a by the USDA scale.

Coldest zone's winter temperature is −6.7 … −3.9 °C.

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

Alternative climatic zone of gardening for Castel Gandolfo by UK RHS scale is H4.

Plants of H4 RHS hardiness zone suitable for outdoor gardening and growing in this winter frost zone H4 RHS.

Castel Gandolfo @ wikipedia.

* The lowest temperature in Castel Gandolfo was -5.3 °C on 28/02/2018.