What plant hardiness zone is Bürchen

Bürchen is located at Westlich Raron, Valais (Wallis) (VS), Switzerland.

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

Coldest zone's winter temperature is −23.3 … −20.6 °C.

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

Alternative climatic zone of gardening for Bürchen by UK RHS scale is H7.

Plants of H7 RHS hardiness zone suitable for outdoor gardening and growing in this winter frost zone H7 RHS.

Bürchen VS @ wikipedia.

* The lowest temperature in Bürchen was -20.7 °C on 06/02/2012.