Iowa frost dates: J

City	Last frost	First frost	Season	Zone
Jamaica	Apr 25	Oct 10	168 d	5a
Janesville	Apr 27	Oct 10	166 d	5a
Jefferson	Apr 26	Oct 9	166 d	5b
Jesup	Apr 30	Oct 7	160 d	5a
Jewell	May 3	Oct 2	152 d	5a
Johnston	Apr 19	Oct 18	182 d	5b
Joice	Apr 30	Oct 7	160 d	5a
Jolley	Apr 26	Oct 10	167 d	5a