Average last spring frost
This is a statistical estimate of when the final spring frost tends to occur. Frost-sensitive crops may still need protection if a later cold event is forecast.
Average first fall frost
This is a statistical estimate of when the first fall frost tends to occur. Use it to judge whether a crop has enough time to mature and whether protection may extend harvest.
Frost-free growing period
The interval between average spring and fall frost dates is a planning estimate, not a promise of frost-free weather. Edaphia may calculate windows a number of weeks before or after these dates.