Our local agricultural extension provides some great materials for successful landscaping and gardening in our unique Central Texas area. I had several documents detailing what time of year to plant what type of vegetable, but the formatting made them difficult to use. They were either lists of veggie types with bar graphs for what month to plant, or lists of veggies with a date range to plant each. But like most gardeners, I want to know when I go into the garden, what can I plant TODAY? So I organized the information into a list categorized by month with the appropriate veggies listed alphabetically. It's easy enough to scan to see, "When can I plant peas," if you wonder about that sort of thing, but far easier to just take a glance, grab the right seeds, head out, and put some in the dirt. I keep mine taped inside my kitchen cupboard next to the fridge, where I keep my seed packets.
On the reverse are simple instructions I prepared while teaching a local gardening class for square foot lasagna gardening, my combined version of the two easiest garden methods I've ever come across. That is useful no matter where you live. You can also copy/paste the chart into your own word processor to adjust the veggie types to you specific area if you don't live around Austin.
