First Frost Date 2025 Ottawa. Frost dates are arranged by region and include the first frost date of the season and the final frost date of the season. Chance is a prediction of how ideal the conditions are for a storm to enter the region.

Temperatures across the region, including eastern ontario, are expected to dip to the freezing mark, hitting 2 c in ottawa and 1 c in gatineau, bringing patchy frost. Enter your zipcode and we’ll give you all the info we have.