tree zones alberta hardiness plant

Climate changes in Calgary: gardening in Zone 4a

planter, hellebores, and a slug

Based on climate data collected from 1981 to 2010, most of Calgary now lies in the warmer plant hardiness zone 4a. This means we can be more adventurous in our plant selection: at first this sounds like heaven - but not quite. Tree budburst dates are earlier, but the dates of late frosts have not changed so much, so fruit tree blossom will suffer more from late frosts. There are two different methods to identify what zone we garden in. The simplest is that published by the U.S.

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