Idaho frost dates: O

City	Last frost	First frost	Season	Zone
Oakley	May 15	Oct 2	140 d	6b
Ola	May 31	Sep 16	108 d	7a
Oldtown	May 12	Sep 21	132 d	6a
Orofino	Apr 20	Oct 20	183 d	7a
Osburn	May 14	Sep 26	135 d	6b