Sunday morning, 21 Oct 2018:
In early October, warm days and cool clear nights are the perfect combination for dew on the grass. One of these nights the temperature of the grass will drop below freezing and the dew will form as frost.
Have you had frost in your neighborhood yet?
Tonight might be the night.
p.s. If the air is below freezing but not humid, the plants freeze without a frost.
(photo by Kate St. John)