What plant hardiness zone is Solothurn

Solothurn is located at Solothurn, Solothurn (Soleure) (SO), Switzerland.

Plant hardiness zone (winter frost zone or gardening zone) for Solothurn is 7b by the USDA scale.

Coldest zone's winter temperature is −15 … −12.2 °C.

Plants of 7b USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 7b USDA.

Alternative climatic zone of gardening for Solothurn 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.

Solothurn @ wikipedia.

* The lowest temperature in Solothurn was -15 °C on 14/02/2013.