The first addition to the list was The National Gardening Association's When To Plant Chart. Plug in your info (North America) and up pops a chart with indoor and outdoor planting dates. There are separate printable lists for Spring and Fall. As you can see, I'm using the print out as a worksheet.
I also splurged and picked up Clyde's Vegetable Planting Chart. This chart keys off of the Spring and Fall frost dates. Mine are April 20th and October 20th. They include a pretty extensive list of the dates in the U.S and Canada.
The Farmer's Almanac has a Best Days section that is chock full of advice on when it's advantageous to plant and when it's not.
March 5th - 6th
Start seedbeds. Good days for transplanting. Excellent time for planting root crops that can be planted now. Also good for leafy vegetables.
This list is fun to just read through just for the activities it covers.
March 7th
Dry Fruits and Vegetables, Cut Hair to Slow Growth, Mow to Slow Growth, Castrate Farm Animals, Pick Apples and Pears, Wean, Quit Smoking, Potty Train, Perform Demolition, Wash Wooden Floors, Wash Windows, Start Diet to Lose Weight, Advertise to Sell, Buy a Car, Kill Plant Pests
In conjunction with the Best Days recommendations, I also checked the Farmer's Almanac Moon Phase calendar I ordered last year - props to Doug and Stacy on YouTube for making it easily available. This video speaks of 'planting posts and laying gravel', but I don't see why planting a garden wouldn't benefit from this approach as well. The next dates showing a 'cupped moon' runs from March 6th through 18th.
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