When does the flea and tick season start? - briefly
The flea and tick season generally starts in early spring, around March – April, and lasts until late fall. Peak activity occurs during the warmest months, typically June through August.
When does the flea and tick season start? - in detail
Flea and tick activity begins when ambient temperatures consistently exceed the threshold at which immature stages can develop. Most species become active at average daily highs of 45 °F (7 °C) or higher, provided relative humidity remains above 50 %.
In temperate zones the start of the period varies with latitude:
- Southern regions (e.g., Texas, Florida, Mediterranean coast) – activity may appear in February, sometimes earlier if mild winters persist.
- Mid‑latitude areas (e.g., central United States, central Europe) – first detections typically occur in March‑April.
- Northern zones (e.g., New England, northern Scandinavia) – season usually commences in May‑June, when soil and surface temperatures reach the required range.
Temperature is the principal driver, but humidity and photoperiod also influence emergence. Warm, moist ground accelerates egg hatching and larval development; dry conditions can delay or suppress activity even after temperature thresholds are met.
Life‑cycle timing aligns with host availability. Adult fleas and ticks emerge from overwintering stages to seek blood meals from mammals and birds. Consequently, the earliest month of host‑seeking behavior matches the first sustained warm days of spring.
Preventive measures should begin one month before the expected onset in each region. Actions include:
- Regular inspection of pets and livestock for attached parasites.
- Application of approved topical or oral acaricides and insecticides according to label schedules.
- Environmental treatment of yards, especially shaded, humid areas where larvae develop.
- Removal of leaf litter, tall grass, and debris that retain moisture.
Monitoring local weather reports for consecutive days above the 45 °F threshold provides a reliable indicator that the period of heightened flea and tick risk is imminent.