The Frost Atlas
Canada, drawn by its weather stations: 655 official points of the 30-year climate record. Colour is the length of the frost-free season. Tap any station for its dates.
Dots placed by true station coordinates; no basemap needed, the record draws the country. Source: ECCC Canadian Climate Normals.
The record's extremes
262 days
Green Island, BC
14 days
Resolute Cars, NU
July 9
Resolute Cars, NU
July 24
Resolute Cars, NU
Mean dates over the 30-year normal period; individual years vary widely. National average frost-free season: about 124 days.
Reading the Atlas
Where is the longest growing season in Canada?
In the official 30-year record, Green Island holds the longest mean frost-free season at 262 days. The national average across 638 stations with frost normals is about 124 days.
Where is the shortest growing season in Canada?
Resolute Cars records a mean frost-free season of just 14 days. At stations like this, frost can arrive in any month and season extension is the difference between a garden and none.
What am I looking at?
Every dot is one of 655 official Environment Canada weather stations, placed by its real coordinates; together they trace the inhabited shape of the country. Colour is the length of the mean frost-free season. Tap a dot for that station's frost dates and winter tire windows, then send them to your calendar.