You still have a full month in central-NC before common "last frost". A lot of summer crop stuff won't take off growing until late-April/early-May anyway. Pretty much every summer crop is fair game in our area. During July/August tom/pepper production may slow down, but come Sept/Oct plants are flush with flowers and fruits. The only "summer" crop I've seen suffer a bit are common string beans which sometimes stop producing mid-summer if we have extended extremely high heat and they're in full sun.

Unfortunately, you're seeking an answer that can't be given. There really is no such thing as a 'deer proof' planting. Go to Google and do a search for 'deer proof'...then immediately do an advanced search using 'New England' to cull the initial hits you get for the local area. In both the initial hits and the advanced hits you'll find lists...lots of lists...of plants suggested for areas where the deer roam...and eat. But you'll also find, in almost each case, that the lists contain the caveat that the plants listed are not deer 'proof'. They're plants that some folks have had good success with, or plants that deer seldom eat, or plants that come back quicker than others...if at all. But everyone who makes such lists will also tell you that those lists change as easy as the deer appetite does. Deer will eat almost anything if they're hungry enough, and the weather has a lot to do with that. Experience will show that only (nearly) true defense against deer damage in the garden and yard...is deer fencing, and eight foot fencing at that. When the snow lies heavy and deep on the ground, a six foot fence can suddenly become an easily jumped four foot for the deer. The taller fence provides a little more defense. But here, too, there is that caveat...(nearly) true. The deer really do hold the upper hand here. We can only try to keep them at bay.

I found the Michigan State University Extension website that has gardening information for your area and another site with a planting chart that you may find useful. I googled "Michigan vegetable planting guide" and there are several websites with information that you may be able to use. http://www.migarden.msu.edu/ http://www.squidoo.com/zone5 http://www.thevegetablegarden.info/resources/planting-schedules/zones-5-6-planting-schedule I usually plant a week or two earlier than my local extension service recommends since raised beds warm faster. Happy gardening.

The Seed Starters Handbook (an actual book) is a good resource. I’m not sure your ideal of a plug and go spreadsheet, while appealing, is realistic. Think of the vast numbers of plants that exist on the planet and the database needed to support such a thing. A zone would be fairly simple to add but frost free dates are all over the place in a single town, let alone a single zone. But you can put together one that suits your needs. Clothier has a format that covers the basics for example. Environmental data is available from extension services (UMass is one example follow the link and click on environmental data https://ag.umass.edu/landscape/landscape-message-mar-31-2017) In your example the punctuation may be an issue. It may mean plant 2- 4 weeks before frost free or in the fall once the soil has cooled to about 55, but not in early fall when the soils might be warm enough that seed germinates before winter. Best of luck with your search and your planting.