Our annual risk index blends CDC Lyme surveillance, last winter's temperatures, and reported tick encounters. Hover any state for its outlook. Mild winters mean more ticks survive — and 2025–26 was the fourth-warmest on record.
Ticks present but disease incidence is low. Standard precautions on trails.
Lone star and dog ticks active spring through fall. Repellent advised for grass and woods.
Established blacklegged (deer) tick population. Lyme and anaplasmosis reported. Treat clothing with permethrin.
Among the highest Lyme incidence in the nation. Peak nymph activity May–July: permethrin on clothing + 12-hr skin repellent, daily tick checks.