51.0500°N/114.0700°W
When to plant in Calgary
Alberta, Canada · Subarctic (Köppen Dfc)
Last spring frost · safe
Jun 10
~10% frost risk · typical May 22
First fall frost · safe
Sep 7
~10% frost risk · typical Sep 19
Frost-free days
120
May 22 → Sep 19
Climate zone
Subarctic
Köppen Dfc
82/100 confidence
◇ Station-based
The frost date shown is the safe date (~10% frost risk); the typical median is shown alongside. Your microclimate can shift things ±1–2 weeks.
The growing year
Frost-bounded season with crops mapped onto the 12-month axis.
Frost risk Growing Harvest
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
NOV
DEC
FROST
FROST
GROWING SEASON — 120 DAYS
MAY 22
SEP 19
Full crop calendar
Source: Curated · based on NOAA GHCN-Daily 1991–2020 normal · Köppen–Geiger classification (Beck et al. 2023) · crop windows from FAO ECOCROP references. How we calculate this →
Also see frost dates for Calgary.