Guard your garden - preparing for frost in Missouri

By Blake Jackson

As the temperatures drop and frost becomes a looming threat in Missouri, it's time for gardeners to take steps to protect their plants.

MU Extension experts David Trinklein and Zachary Leasor offer valuable advice on how to safeguard your garden from the approaching cold.

While the exact timing of frost varies across the state, northern regions can expect it within two weeks. Central Missouri typically sees its first freeze around October 20, while southern parts experience it around November 1. The Ozarks are prone to earlier frosts due to their higher elevation.

Not all plants are equally vulnerable to frost. Tropical species, in particular, can suffer "chill injury" at temperatures well above freezing. These plants, often grown in containers, should be brought indoors early in the fall if possible.

Most plants can withstand temperatures down to 28 degrees Fahrenheit without significant damage, except for sensitive tropical varieties.

Cool-season flowers and vegetables can tolerate even lower temperatures, depending on the specific species and their exposure to gradually cooler conditions.

Trinklein's approach to fall plant protection differs from that of spring. While gardeners strive to prolong the growing season in the fall, they are ultimately preparing for the inevitable end. In the spring, however, protecting plants is an investment in future growth and rewards.

To protect plants from frost, the key is to preserve the latent heat stored in the soil or growing medium. This can be achieved by using insulating materials like floating row covers.

While these materials may only provide a couple of degrees of protection, they can be more effective in the fall when the soil retains more latent heat.

As the growing season concludes, Trinklein encourages gardeners to embrace the natural cycle and prepare for winter.

By taking appropriate measures to protect their plants from frost, Missouri gardeners can extend the growing season and enjoy the fruits of their labor.

University of Missouri Extension’s Frost/Freeze Probabilities Guide.

Photo Credit: gettyimages-johnbraid