Well...from what I've seen online, we usually get freezing temperatures around late October around here in New Jersey. According to the following website...
"Each winter, on average, your risk of frost is from October 7 through May 5.
Almost certainly, however, you will receive frost from October 21 through April 20."
For whatever reason, it only mentions frost and not freezing temperatures, but I assume that freezing temperatures should be common on average when frost is likely to occur. While the risk of frost says October 7th, my best guess for freezing temperatures is about October 21st.