Last Frost Date Data for Indiana

Traditionally, the last frost date for NE Indiana where we live is 15 May but this is the simplistic date.  One can get a better estimated date by following the link to this site. For those suspicious people the actual url is http://www.webgrower.com/regional/frost-pdf/IN.pdf .  To use this chart correctly you must determine your risk factor  and the 50 column means a 50/50 chance that a frost will occur..  If you plant seeds and the germination time is 7 days then the odds are greater than 50/50  and guesstimated to be 80/20.  A 20 percent risk chance is reasonably low.  Anyway study the chart and take the chance level you feel comfortable on taking. Cheers.