How much warning will I get before a frost?

Typically 2–3 nights, which is the range a frost forecast is reliable. That is enough time to cover plants with row cover, water the soil before a freeze, or harvest tender crops ahead of the cold.

Are frost alerts based on a fixed date?

No — the alert uses the live forecast for your city, not a fixed calendar date. For long-term averages, use the frost date calculator. The alert fires only when frost is actually predicted in the next few nights.

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Frost Alerts Canada

Frost alerts for Canadian gardeners — get a free email when frost is forecast in the next 2–3 nights for your city, so you can cover your plants before it's too late.

How do frost alerts work? Pick your Canadian city below. We check the local forecast every morning, and when an overnight low at or below freezing is expected in the next 2–3 nights, we email you so you can cover tender plants, water before the freeze, or harvest ahead of it. Free, your city only, unsubscribe anytime. A single night of protection can save a tomato or pepper crop weeks before its natural end.

🔔 Free frost alert

Get an alert when frost threatens your city

One email when frost is forecast in the next 2–3 nights where you live — so you can cover your plants in time. Based on the real forecast, not just the average date.

I agree to receive frost alert emails. Unsubscribe anytime.

How frost alerts work

Pick your cityChoose from 45+ Canadian cities. We tie your alert to that city only.

We watch the forecastEvery morning we check your city's overnight low temperatures for the next few nights.

You get an email only when it mattersWhen frost is coming, you get one heads-up — not daily spam. Quiet when there's no risk.

Frequently asked questions

Is the frost alert free?

Yes — completely free. We ask only for your email and city so we can send the right alert to the right people. Unsubscribe anytime with one click.

How much warning will I get?

Typically 2–3 nights, which is the range a frost forecast is reliable. That's enough time to cover plants with row cover or sheets, water the soil before a freeze (moist soil holds heat), or harvest tender crops ahead of the cold.

Which frost dates are these based on?

The alert uses the live forecast for your city, not a fixed calendar date. For the long-term averages, see your city's frost page or the frost date calculator — and for what to plant right now, the What to Plant Now tool.