There is usually relief provided for nuisance animals that may not be provided with the hunting laws. You may want to find this regulation and print it out for your protection if DNR comes calling. Hunting crows out of season is not legal, but shooting a nuisance crow may be. It would be best to know what constitutes a nuisance, such as damage to crops, but it would be hard to argue crop damage to your corn in March.

The following is an excerpt from Maryland House Bill 196:
c) The Department shall establish by regulation the maximum open season
for hunting crows which is permissible under federal law, and shall include in its
regulations such provisions as are permitted under federal law for control of crows at 1 any time they are found to be committing or about to commit depredation upon 2 ornamental or shade trees, agricultural crops, livestock or wildlife, or when 3 concentrated in such numbers and manner as to constitute a health hazard or other 4 nuisance.