CT Scientists Warn of Alarming Early Tick Activity in 2026
Connecticut researchers logged over 100 tick submissions in a single day in early April, with Lyme disease rates hitting 40%—well above the historical average.
Tick submissions to the Connecticut Agricultural Experiment Station topped 100 in a single day earlier this month. That’s the threshold researchers associate with peak activity. Peak season doesn’t typically arrive until May, June, October, or November. It’s April.
“This time of the year, considering this is just the beginning of higher tick activity and we haven’t reached the peak, this number is quite disconcerting,” said Dr. Goudarz Molaei, a medical entomologist who directs the Experiment Station’s Connecticut Agricultural Experiment Station’s Tick Testing Program.
The numbers alone are bad. What’s in those ticks makes it worse.
Researchers at the Experiment Station are testing submitted ticks at a 40% positive rate for Lyme disease. The historical average over the past two decades sits at roughly 32%. That gap matters. It means a bite from an infected tick carries a meaningfully higher chance of disease transmission than Connecticut residents have faced before in 2026.
The Experiment Station collects ticks pulled from Connecticut residents, submitted through local health departments, then screens them for pathogens. The service is free. It’s also generating data that scientists weren’t expecting to see this early in the calendar year.
A Cold Winter Didn’t Help
Many Connecticut residents figured last winter’s cold stretches would thin out the tick population. That’s a reasonable assumption. It’s also wrong.
“Despite our expectation, or public expectation, that the past rather cold winter would put some dent on tick populations, we are not seeing that,” Molaei said.
Cold winters don’t reliably kill ticks. The species that carry Lyme disease are adapted to survive under snow cover, and a single hard freeze isn’t enough to drive populations down. This year proved the point. The Experiment Station’s submissions data through April 09, 2026 tells a clear story: tick activity is running well ahead of schedule, and it’s not slowing down.
Invasive Species Along the Coast
Connecticut’s dominant tick species remain the black-legged deer tick and the American dog tick. But Molaei flagged something residents in Fairfield and New Haven counties should pay close attention to: invasive species aren’t rare visitors anymore. They’re establishing themselves.
Lone star ticks, Gulf Coast ticks, and longhorned ticks are all showing up in Connecticut, concentrated along the shoreline. “These ticks are capable of transmitting their own suite of pathogens,” Molaei said. That’s not a small concern. Lone star ticks have been linked to alpha-gal syndrome, a red meat allergy triggered by a bite. It’s a condition most people haven’t heard of, and it’s showing up in states that didn’t see lone star ticks a generation ago.
Molaei doesn’t think the spread of invasive species or the earlier onset of tick season is coincidental. Climate is driving both. “Temperature, humidity, vegetation, habitat type: all of these are changing as the result of climate change,” he said. Warmer winters and longer shoulder seasons extend the window during which ticks are active and reproduce. That window has been creeping earlier each spring.
The CT Mirror first reported on the Experiment Station’s early-season data. What it shows is that we’re not dealing with a single bad week. The trend is structural.
Fairfield County consistently ranks among the highest Lyme disease burden areas in the country. A jump from a 32% to a 40% infection rate in the ticks themselves, before peak season, compounds the risk for anyone spending time in wooded or brushy areas, including commuters cutting through suburban trails, kids at spring sports, and weekend hikers throughout the state.
Researchers aren’t saying don’t go outside. They’re saying be careful when you do. Wear repellent. Check yourself after spending time outdoors. Don’t assume that because it’s still early spring, the risk isn’t real.
“Using tick repellents when hiking or camping and conducting tick checks remain the best ways to reduce the risk of contracting tick-borne diseases,” White said.
The Experiment Station’s Tick Testing Program is free and open to Connecticut residents. If you find a tick that’s been attached, submit it. The data you provide helps researchers track what’s circulating, where, and how fast it’s spreading.