In the tri-state area, first frost dates can vary with higher elevation and when cold weather fronts pass after Oct. 11 through Nov. 20.
Forecasting frost - Met Office
Science of Snow National Snow and Ice Data Center
FROST: What is Frost, How Frost is Formed, Types of Frost, Which Areas are Frost Free, Effects of Frost
Hair ice fungus: what it is and how this rare magical winter sight forms - Discover Wildlife
What is a frost quake? Cold weather phenomenon explained
How frost forms and the different types
Here's why you need to know the difference between hoarfrost and rime ice
Guide to Frost
Frost, Freezing Temperatures, Sublimation & Effects on Plants