Interesting, thanks! (It figures I’d be part of that northern south.)Planting tomatoes between 4/20 and 5/10 is only for the few counties that are in the southern zone of Missouri. It's pretty strange that part of south west and central are in the north zone!
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https://extension.missouri.edu/media/wysiwyg/Extensiondata/Pub/images/g06201.jpg
https://extension.missouri.edu/publications/g6201?p=1
JT