What plant hardiness zone is Boulogne-sur-Mer

Boulogne-sur-Mer is located at Pas-de-Calais, Hauts-de-France (HDF), France.

Plant hardiness zone (winter frost zone or gardening zone) for Boulogne-sur-Mer is 8a by the USDA scale.

Coldest zone's winter temperature is −12.2 … −9.4 °C.

Plants of 8a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 8a USDA.

Alternative climatic zone of gardening for Boulogne-sur-Mer by UK RHS scale is H5.

Plants of H5 RHS hardiness zone suitable for outdoor gardening and growing in this winter frost zone H5 RHS.

* The lowest temperature in Boulogne-sur-Mer was -10.8 °C on 12/02/2012.