What plant hardiness zone is Seiersberg-Pirka

Seiersberg-Pirka is located at Graz-Umgebung, Styria (Steiermark) (STM), Austria.

Plant hardiness zone (winter frost zone or gardening zone) for Seiersberg-Pirka 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 Seiersberg-Pirka 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.

Seiersberg-Pirka @ wikipedia.

* The lowest temperature in Seiersberg-Pirka was -18.5 °C on 08/02/2012.