When can I plant tomatoes in Iowa?

Question: 

When can I plant tomatoes in Iowa?

Answer: 

Transplant tomatoes into the garden after the danger of frost is past.  In central Iowa, it’s usually safe to plant tomatoes around May 10.  Gardeners in southern Iowa can plant one week earlier, while those in northern areas should wait an extra week.  The last practical date for planting tomatoes is approximately June 20.  

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