Marilyn's Photos - Oct 7 2026 - Frost Ahead but when
So far, we've had pleasant Fall weather. No frost expected in the next week or two. This time of year I bring the tropical plants into the greenhouse. That makes me attentive to the evening temperatures. Here's what the advice is for predicting whether frost will happen tonight.
How warm was it during the day? If the temperature reached 75ºF (in the East or North) or 80ºF (in the desert Southwest), the chance of the mercury falling below 32ºF at nighttime is slim.
Is it windy? A still night allows cold air to pool near the ground; a light breeze stirs things up; a heavy, cold wind sweeps away warm air near the ground.
Is it cloudy? If the Sun sets through a layer of thickening clouds, the clouds will slow radiational cooling and help stave off a frost.
What is the dew point? As a rule of thumb, don’t worry about a frost if the dew point (the temperature at which water vapor condenses) is above 45 degrees on the evening weather report.
How is your garden sited? Gardens on slopes or high ground often survive when the coldest air puddles down in the valleys and hollows.
How far are your plants from the ground? Those plants that are close to the ground have a better chance of being protected by the warmth of the earth.
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