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[HDessureault <inter.verbis@videotron.ca>]

Here in northern climates, the bees usually swarm after the main crop of
dandelions is over, so end of june or beginning of July.
But they can swarm anytime after a population expansion in the hives, the
birth of queens, which failing to replace the existing queen, chose to leave
with a group of followers. There are also cases of hive population
moving when the survival of the hive is threatened in its present location.
That is a bit different to a true swarming as there is usually no division
of the bees population.
In June and generally, the work of beekeeping involves watching for sign of
swarming and preventing it by increasing the space available and destroying
queens before their birth or moving them with a small number of bees to
begin a new hive, therefore giving them a new home to populate before they
swarm away.

Hélène Dessureault
Zone 3-4