What plant hardiness zone is May

May is located at Lemhi County, Idaho (ID), USA.

Plant hardiness zone (winter frost zone or gardening zone) for May is 5a by the USDA scale.

Coldest zone's winter temperature is −20 … -15 °F.

Plants of 5a USDA hardiness zone suitable for outdoor gardening and growing in this winter frost zone 5a USDA.

May, Idaho @ wikipedia.