Know your zone and your season length
Know your zone and your season length
Plant hardiness zone (Calgary)
Canada’s Plant Hardiness Site lists Calgary as Zone 4a (1991–2020) (and 3a for 1961–1990), reflecting how the “official” zone has shifted over time.
Frost dates (planning your planting window)
Your practical growing season is defined by frost risk, not the calendar. Use local frost-date tools when timing seeding, sod, and planting.
In Calgary, it’s normal to see warm spells followed by late cold snaps—so build flexibility into your schedule (especially for tender annuals and new plantings).