What plant hardiness zone is Cologne (Köln)

Cologne (Köln) is located at North Rhine-Westphalia (NRW), Germany.

Plant hardiness zone (winter frost zone or gardening zone) for Cologne (Köln) is 7a by the USDA scale.

Coldest zone's winter temperature is −17.8 … −15 °C.

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

Alternative climatic zone of gardening for Cologne (Köln) 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.

Cologne @ wikipedia.

* The lowest temperature in Cologne (Köln) was -17 °C on 07/02/2012.