Ragweed season is mid-August to October.
Ragweed Season begins around the Summer Solstice (June 21st) and lasts until the first frost. However, due to climate change, Ragweed Season is getting longer and longer: the warmer climate is condusive to the growing of Ragweed, and its resulting pollen which causes widspread allergies in humans.
Traditionally Ragweed season starts the first week of August but it officially starts when it reaches 10/m3. This year the ragweed season started on August 4th. (2011)
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