Herb Planting Guide
I have the 2017 "Planting Dates for Vegetable Crops in MD". Is there one for herbs as well?
Harford County Maryland
No, there are not plans for this.
Generally the plants are either winter hardy or not. If they are not, they are annuals, meaning they'll die with a freeze, these should not be planted out until after the last frost for your area, which is around Mother's Day.
If they are perennial, they could be put out earlier, and these would appreciate some winter protection, which is covered on the Herb portion of our website, here: