When Is Tick Season in St. Louis? A Seasonal Guide to Protecting Your Family
You love spending time outdoors with your family; hiking at Castlewood State Park, playing in the backyard in Wildwood, or walking the dog through Queeny Park. But every spring, the same worry creeps in: ticks.
The thought of a tick latching onto your child or pet is enough to make you want to stay inside. But you shouldn't have to choose between enjoying the outdoors and keeping your family safe. Understanding when ticks are most active in the St. Louis area and what to do about it, puts you back in control.
When Are Ticks Active in St. Louis?
Tick activity in the St. Louis metro area typically begins in March when temperatures start reaching 50°F consistently, and it continues through November. Peak season runs from April through July, which is exactly when families are spending the most time outdoors.
According to the University of Missouri Extension's guide on ticks and tick-borne diseases, Missouri is home to several medically significant tick species, and the state's warm, humid climate supports large populations throughout the spring and summer months.
A common misconception is that ticks disappear in fall. In fact, as the MU Extension has reported, fall is prime time for ticks because deer—their preferred hosts—are more active during mating season, moving through suburban neighborhoods in Jefferson County, Eureka, and other wooded areas around St. Louis.
Which Ticks Should St. Louis Homeowners Worry About?
Four tick species are most relevant to homeowners in the St. Louis metro.
Lone Star Tick
The lone star tick is the most common species in Missouri. Female lone stars are easy to identify by the white dot on their back. They're aggressive biters and are linked to ehrlichiosis and alpha-gal syndrome, a condition that can cause a serious allergy to red meat.
American Dog Tick
The American dog tick transmits Rocky Mountain spotted fever, which can be life-threatening if not treated quickly. It's commonly found in grassy areas and along trails.
Blacklegged (Deer) Tick
The blacklegged tick is the primary carrier of Lyme disease in the United States. While Missouri isn't in the highest-risk zone for Lyme, the tick is present here, and Washington University physicians have noted that other tick-borne diseases with Lyme-like symptoms do occur in the area.
Asian Longhorned Tick
The Asian longhorned tick is an invasive newcomer. We wrote about its first confirmed discovery in St. Louis County—a development that pest professionals and public health officials are watching closely.
What Diseases Are Ticks Spreading in Missouri?
Missouri consistently ranks among the top states for tick-borne illness. The diseases most relevant to our area include ehrlichiosis (the most common in our region), Rocky Mountain spotted fever, tularemia, Heartland virus (first discovered in Missouri in 2009), and alpha-gal syndrome.
The CDC's tick overview is an excellent resource for understanding symptoms and when to seek medical attention. The key takeaway: if you develop a fever, rash, or muscle aches after a tick bite, see a doctor immediately.
How to Protect Your Family
Start with the basics: wear long sleeves and pants when hiking, use EPA-approved repellents, and do thorough tick checks on yourself, your kids, and your pets after any time spent outdoors. Keep your grass trimmed and remove leaf litter from the edges of your yard—ticks thrive in that transitional zone between lawn and woods.
But for homeowners in St. Louis County and St. Charles County who have wooded lots or back up to green space, DIY measures often aren't enough. That's where professional barrier treatments make a real difference.
Our tick and mosquito service provides monthly treatments from March through October that dramatically reduce tick populations on your property. The treatments target the areas where ticks live—not where your family plays.
Here's How We Help
Schedule a consultation. We assess your property's tick risk based on its layout, vegetation, and proximity to wooded areas.
We create a custom treatment plan. Monthly barrier applications during active season, plus targeted yard treatments.
Enjoy your yard worry-free. Let your kids run barefoot, let the dog roll in the grass, and stop dreading every outdoor outing.
Pure Pest + Lawn has been protecting St. Louis families since 1933. With over 1,000 five-star reviews and the BBB Torch Award for Ethics, we're the trusted choice for responsible pest control that keeps your family safe—without making you feel like you're living in a chemical zone.
Don't wait for peak season. Call 314-222-PEST (7378) or schedule online.
