When to Plant

Onion plants are hardy to twenty degrees or less so they can be planted early. The earlier the onion is planted, the more time the onion has to make more top and therefore larger onions. If you refer to the USDA Plant Hardiness Zone Map, the following chart will assist you in determining your planting date.

ZonesBest VarietiesDates to Plant
9-11Short DayJan 1- Jan 15
8Short DayJan 15-Feb 15
7Short or IntermediateFeb 15-Mar 15
6Short or IntermediateMar 1-Apr 1
5Intermediate or LongMar 15-Apr 15
4Long DayApr 1-May 1
1-3Long DayApr 15-May 1