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Tick season in Maine typically peaks between May and July, and again in October and November, according to the Maine Center for Disease Control and Prevention.

Human encounters with the two most common species of ticks in Maine — the deer tick and the American dog tick — tend to decline in August and September; the majority of human Lyme disease cases are reported in June and July.

Deer ticks, which spread Lyme disease, go through three life stages: larva, nymph and adult. Nymphs peak in activity in late June and early July. Adult deer ticks are most active in the spring and again in mid- to late fall. Tick larvae rarely bite humans.

Adult American dog ticks, which are unable to spread Lyme disease to humans, are most active from April to August.

The Maine CDC notes that ticks are active whenever temperatures are above freezing, particularly over 40 degrees Fahrenheit.

This fact brief is responsive to conversations such as this one.

Sources

• Maine Center for Disease Control and Prevention: Tick Ecology and Tick Testing
• MaineHealth: Tick Species in Maine
• Maine Municipal Association Risk Management Services: TICKS!!!
• University of Maine Cooperative Extension – Tick Lab: American Dog Tick
• University of Maine Cooperative Extension – Tick Lab: Blacklegged Tick or Deer Tick

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