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All species
Time of Year Analysis
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  Ontario Butterfly Atlas Online
  (Toronto Entomologists' Association)

Summary Data
Earliest_Latest__ # Obs. Only 10% on or before...Median (50% earlier and 50% later)Only 10% on or after...
Deciduous, i.e., CarolinianJan 1Dec 26   106,969May 25July 17Sept 18
Great Lakes - St. LawrenceJan 18Dec 6   261,447May 24July 7Aug 28
Boreal - Predominantly ForestMar 6Dec 6     9,988June 3June 28Aug 7
Boreal - Forest and BarrenApr 13Nov 6     2,624June 21July 24Aug 27
All OntarioJan 1Dec 26   381,028May 24July 9 0
Note: Forest regions are defined by Rowe (1972 -- pdf).

Map of 4 Forest Regions