I would not rely on the wikipedia source for bloom dates because they attempt to predict without regard for geography or growing season. The list is coarsely correct but should not be trusted to more than the nearest month or two. (They picked hardiness zone 5, a reasonable midpoint but still very rough.)
The essex county link is a more reliable list IF you live in a growing season that closely matches eastern Mass.
The better way to predict bloom dates is by Growing Degree Days. <http://en.wikipedia.org/wiki/Growing-degree_day orhttp://medinabeekeepers.com/index.php?title=Growing_Degree_Days> Bloom dates calculated based on accumulated GDD can be remarkably accurate and can be easily calibrated not only for your local climate and growing season but even for the current year's weather.
Your local extension office may have a more complete list of plants common to your area and their GDD bloom dates. The extension office may even have a running record of GDD for the nearest weather station.
Mike Rossander
www.rossander.org/infosec
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