When is the last frost in Saint Catharines, ON?

The average last spring frost date in Saint Catharines, ON is Apr 29. This is when it is generally safe to plant frost-sensitive vegetables and flowers outdoors.

When is the first frost in Saint Catharines, ON?

The average first fall frost date in Saint Catharines, ON is Oct 16. Plan to harvest frost-sensitive crops before this date.

How long is the growing season in Saint Catharines, ON?

The growing season in Saint Catharines, ON is approximately 169 days, measured from the last spring frost to the first fall frost.

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Frost Dates for Saint Catharines, ON

Location Saint Catharines, ON

Frost Dates

Saint Catharines, ON

See the average dates of the last frost of spring and the first frost of fall for your location across the U.S. and Canada.

Nearest Climate Station	Altitude	Last Spring Frost	First Fall Frost	Growing Season
PORT DALHOUSIE, ON	298'	Apr 29	Oct 16	169 days

Last and first frost dates are 33% probability. Calculated using 1981-2010 Climate Normals from Environment Canada.

Our frost dates are based on 1991–2020 climate data from the National Oceanic and Atmospheric Administration (NOAA). We use a 30% probability threshold, meaning there’s about a 3 in 10 chance frost will occur before or after the given date. Because microclimates vary—your backyard might be warmer or cooler than nearby towns—use these dates as a flexible guide, not a guarantee.