First Frost Date 2024 Ottawa. Our frost date calculator will tell you precisely when your garden in ottawa, on is at risk for frost. The 2025 almanac predicts a winter with a “heart of cold,” forecasting big freezes and heavy snowfall in.
Expected conditions (temperature and humidity) are too close to predict the type of precipitation. Just one day after summer officially ended, a frost advisory is in effect for ottawa, with temperatures expected to fall near the freezing mark friday night.