Last frost* (temperature down to 32 degrees) in spring: August 2
First frost** in autumn: July 29
There is a greater than 10 per cent chance of frost on all dates of the year.
*The National Weather Service calculates there is a 10 per cent chance of frost occurring after this date, so be prepared to cover tender plants for a week or two after this date. If you are willing to monitor the temperature forecast daily and cover plants as needed, it is reasonably safe to set plants out up to two weeks before the “last frost” date reported here.
**The National Weather Service calculates there is a 10 per cent chance of frost occurring before this date.
Data courtesy of National Climatic Data Center, National Oceanic and Atmospheric Administration.