What plant hardiness zone is Basel

Basel is located at Basel-Stadt (Basle-City) (BS), Switzerland.

Plant hardiness zone (winter frost zone or gardening zone) for Basel is 6b by the USDA scale.

Coldest zone's winter temperature is −20.6 … −17.8 °C.

Plants of 6b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 6b USDA.

Alternative climatic zone of gardening for Basel by UK RHS scale is H6.

Plants of H6 RHS hardiness zone suitable for outdoor gardening and growing in this winter frost zone H6 RHS.

Basel @ wikipedia.

* The lowest temperature in Basel was -20 °C on 04/02/2012.