Derry Township, PA

Nymphs are questing, the highest-risk stage for people. Nymphal deer ticks peak in late spring and summer. They're the size of a poppy seed, easy to miss, and cause most Lyme transmission.

Derry Township is 83% natural land cover (72% forest, plus open and brushy areas) across its 30.73 sq mi, home to about 7,231 people. That makes it the 9th-most wooded of the 16 towns in Mifflin County. Deer ticks live in wooded areas, along trail edges, and in tall grass — the more of that a town has, the more places ticks can quest.

Mifflin County reports about 139 Lyme cases per 100,000 people a year, the 103rd-highest of 210 Northeast counties. That county-level disease pressure, combined with Derry Township's local habitat, sets how high its daily score can climb when the weather and season allow.

Yes. Nymphs are questing, the highest-risk stage for people. In Derry Township, today's risk reads moderate (47/100). Ticks are active. Use repellent, stick to trails, and do a tick check when you come inside.