When are Lyme disease ticks most active?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Lyme disease ticks—primarily blacklegged (deer) ticks—are most active during the warmer months, with peak activity in spring and summer. Nymphs, the tiniest and hardest-to-spot stage, are especially active from May through July, making this the highest-risk window for human bites and Lyme transmission. Adult ticks remain active into fall and can even bite on mild winter days above freezing.

If you've recently been outdoors, spotted a tick, or noticed symptoms like a rash, fever, fatigue, or joint pain, don't wait to find out what's going on. Early detection is critical—Lyme disease is far easier to treat when caught early, and delays can lead to long-term complications. Take a free, instant, online symptom check to better understand your symptoms and confidently plan your next steps.

Reviewed for medical accuracy: 07/15/2026

Important Next Steps

Discover if your tick exposure could cause Lyme Learn likely causes of Lyme-like symptoms See if your symptoms need urgent care Find OTC relief for Lyme symptoms Find a Lyme disease specialist near you Understand safe home remedies for Lyme symptoms Find out if it could be Lyme

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Explanation

Ticks that spread Lyme disease, like the Ixodes ticks, are most active when the weather is warm.

Spring and Summer: These ticks are most commonly found in the spring and summer months. During this time, they are searching for hosts to feed on, which increases the risk of Lyme disease transmission.
Fall Activity: Some tick species may also show activity in the fall, but it is generally less than in the spring and summer.

Understanding when ticks are active can help in taking precautions to avoid tick bites, such as wearing protective clothing and using tick repellents when spending time outdoors in tick-prone areas. If you've been bitten by a tick or are experiencing symptoms like fever, rash, or fatigue, use our free AI symptom checker to help determine if you should seek medical attention.

(References)

Burtis JC, Bjork J, Johnson TL, Schiffman E, Neitzel D, & Eisen RJ. (2023). Seasonal activity patterns of host-seeking Ixodes .... Journal of medical entomology, 37075475.
Salkeld DJ, Castro MB, Bonilla D, Kjemtrup A, Kramer VL, Lane RS, & Padgett KA. (2014). Seasonal activity patterns of the western black-legged tick, .... Ticks and tick-borne diseases, 25113980.
Piesman J, Mather TN, Dammin GJ, Telford SR 3rd, Lastavica CC, & Spielman A. (1987). Seasonal variation of transmission risk of Lyme disease .... American journal of epidemiology, 3687924.

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