A change from how it used to report when it stocks trout streams, Maryland now has a PDF for the 2012 trout fishing seasons that lists when it plans to stock streams in the state. The current version as of January 29, 2012 is for the spring season (“pre-season” to May 2012). It lists the streams and the number of fish planned for stocking in each period (typically but not always a week), all broken down by county.
I’m not sure when “pre-season” begins, but I assume it’s very soon given that the first period listed is “March 11-31.” I guess in some ways this is better than the states like Virginia that just publish this info on their websites for a week or so up to and including the current date.