Ticks & Prevention
Seasonal Tick Risk
Ticks don't take a winter vacation. Knowing when each life stage is most active helps you tailor your prevention strategies year-round.
Ticks Are Active More Than You Think
Many people assume ticks are only a summer concern. In reality, black-legged ticks are active whenever temperatures exceed approximately 35°F. In mild regions, that can mean year-round activity. The danger varies by season based on which life stage is feeding.
Month-by-Month Risk Guide
- January–February: Generally low activity in freezing conditions. Adult ticks may emerge on mild days above 35°F. Remain vigilant in southern states.
- March–April: Adult ticks become active with warming temperatures. Real risk begins — adults are visible but can be missed.
- May–July (PEAK): Nymphal ticks are most active. This is the highest-risk period — nymphs are poppy-seed-sized, difficult to detect, and responsible for the majority of human Lyme cases. Extra vigilance is essential during these months.
- August–September: Nymph activity decreases. Newly hatched larvae emerge — not yet infected with Lyme bacteria but will feed on reservoir hosts and become infected.
- October–November: Adult ticks are active and seeking their blood meal before winter. A significant second risk period, especially for hunters and fall hikers.
- December: Adult ticks can still be active on warm days. Risk decreases in consistently cold northern regions but remains real in the South.
Never Fully Let Your Guard Down
Lyme disease cases have been reported in every month of the year. A warm winter day is enough to activate adult ticks. Year-round tick checks after outdoor activity remain the most reliable habit.
Regional Variations
Tick activity timing varies by geography. In the Deep South, activity may be near-continuous. In northern New England and the upper Midwest, the active window is shorter but intense. Consult your state health department for local seasonal risk data.