What plant hardiness zone is Olten

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

Plant hardiness zone (winter frost zone or gardening zone) for Olten 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 Olten 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.

Olten @ wikipedia.

* The lowest temperature in Olten was -18.6 °C on 04/02/2012.