How does frost form?

We've entered frost season in Louisville. Meteorologist Alden German explains the science behind frost formation.
Meteorologically speaking, frost formation is relatively simple. Here's what you need to know.

Frost - Facts and Information - World of Phenomena

NWS Science Corner: How does Frost Form with Low Temps Warmer than 32F?

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Frost - Wikipedia

Know Your Frost Types? - Farmers' Almanac - Plan Your Day. Grow Your Life.

Why does frost form on a windshield? How can I prevent it?

Guide to Frost

Science of Snow National Snow and Ice Data Center

Frozen Ground and the Frost Line: How and Why it Freezes - Powerblanket

What is frost and how does it form?

Dew Point vs Frost Point, Schnack's Weather Blog