birch

Most regions of the U.S., with a few exceptions, have experienced their first frost of the season by now. And landscapers are among that select group of people for whom that first dip into freezing temperatures means more than just it’s going to be a chilly day. An avid gardener, I watch that daily high and low with an eagle eye every fall and spring. On more than one occasion, I’ve had to drop everything and make it a priority to move all my pots indoors for the season. As a result, I’ve come to view that 32 degrees F with a sort of mysticism. It seems a dark magic must be at work to transform a vibrant, huge coleus one day into a wilted mess the very next. So what does first frost actually mean and does it end the planting season? Fall Frost Forecasts According to the National Weather Service (NOAA), hitting 32 degrees and first frost in the fall aren’t necessarily synonymous. “Frost can occur when the temperature falls below 36°F, especially in rural areas. It is a localized phenomena and can be quite variable across a small area. While the National Weather Service does not keep track of ‘frost’ in observations per se, we do keep track of when temperatures hit the freezing mark or fall below. Frost becomes more widespread when the temperature falls below 32°F with some freeze possible. A hard freeze is possible when temperatures fall below 28°F.” Here’s a breakdown of NOAA ...