Environment Canada
Frost advisories in Canada
A frost advisory says temperatures cold enough to damage plants are expected. Environment Canada’s impact guide gives frost one level only, moderate — widespread damage to plants or crops — so a frost advisory is yellow. The advisories we read ask you to protect cold-sensitive plants, trees and crops, and to cover plants where frost is likely.
Environment and Climate Change Canada issues three kinds of weather alert. A warning: act now, severe weather is happening or will happen, usually 6 to 24 hours ahead (a tornado can come with less than 30 minutes’ notice). An advisory: act now, for weather less severe but still significant — blowing snow, fog, freezing drizzle and frost. A watch: get ready, the conditions favour severe weather, and it may become a warning. Each alert now also has a colour, for the impact expected where you are.
Where it is in force now
No frost advisory is in force at the moment. As read at 4 November at 03:02 UTC from the warnings Environment Canada publishes.
What the levels mean
- Yellow
- Weather that may do damage, cause disruption or affect health; moderate, local or short-lived impacts. The most common colour.
- Orange
- Weather likely to do significant damage, cause major disruption or affect health; widespread impacts, or impacts that may last a few days. Uncommon.
- Red
- Very dangerous weather, possibly life-threatening, that will do extreme damage and disruption over a wide area and for a long time. Rare.
The three colours as Environment Canada describes them, in our words.
Environment Canada asks you to read the whole text of every alert, whatever its colour: it says what to expect, where, and what to do.
The last 30 days
The areas warned each day, by level.
- 27 October 2026 — 3 areas3
- 23 October 2026 — 3 areas3
- 21 October 2026 — 25 areas25
- 20 October 2026 — 1 area1
- 18 October 2026 — 27 areas27
- 17 October 2026 — 7 areas7
- 13 October 2026 — 6 areas6
- 11 October 2026 — 27 areas27
- 10 October 2026 — 16 areas16
- 9 October 2026 — 45 areas45
- 7 October 2026 — 48 areas48
- 6 October 2026 — 19 areas19
Sources
- Environment Canada: weather alerts (warnings, advisories, watches)
- Environment Canada: colour-coded weather alerts
- Environment Canada: weather impact guides
- Environment Canada: the alerts in force, on its map
Licence of the warnings: Environment and Climate Change Canada · ECCC Data Services End-use Licence 2.1.1