In order to plan the best garden possible, it is very important to know when to start seeds inside and when to safely transplant/direct sow outside after the danger of a frost has passed.
The best information we have found for determining the last spring frost date for just about any area in the United States is at the National Climatic Data Center.. The link below will take you to their website. Once there, simply click on your state and a list of all the weather stations in that state will appear.
Using the 32°F Row and 10% Probability Level will give you the safest planting dates.
Once you have determined your last Spring Frost Date, you can download an Adobe PDF file of the Vegetable Planting Guide below that is the closest date to your last frost:
If you do not have Adobe software on your computer, you can download it for free here: