Tick risk in St. Charles County, Missouri
St. Charles County covers 16 towns. CDC reports too few cases here to publish a county Lyme rate, but each town still has a daily score built from local weather, habitat, and season. Pick your town below for today's reading.
Highest and lowest tick risk in St. Charles County
Peak-season modeled risk. Tick risk is local, even within one county.
At the summer peak, tick risk across St. Charles County runs from Weldon Spring Heights (moderate) at the high end to West Alton (low) at the low end. The difference is habitat: forest cover across the county ranges from 28% to 84%, and more forest and woodland edge means more places ticks can quest for a host.
- Weldon Spring HeightsModerate risk
- JosephvilleModerate risk
- Weldon SpringModerate risk
- New MelleModerate risk
- St. PaulModerate risk
Tick species in St. Charles County
CDC county surveillance (established or reported)
- Deer tickEstablished
- American dog tickEstablished
- Lone star tickEstablished
- Gulf Coast tickNot established
Established in this county for the deer tick, the main Lyme carrier. “Not established” means no CDC surveillance record for St. Charles County, not that a town is tick free. Source: CDC tick surveillance (ArboNET Tick Module), 2025.
Diseases found in local ticks
No CDC tick-testing records for St. Charles County. That is a surveillance gap, not a sign these diseases are absent. Lyme and other tickborne illnesses occur across the region.
Tick control in St. Charles County, MO
Professional tick control across St. Charles County usually means a barrier treatment along the lawn edge, leaf litter, stone walls, and shady borders where ticks wait for a host, applied two to four times a season by a licensed pest control company. It is the single most effective way to cut tick numbers in the part of the yard your family actually uses, and it matters most in St. Charles County's more wooded towns.
How much does tick control cost in St. Charles County?
Most St. Charles County homeowners pay about $100 to $200 per visit for professional tick spraying, or roughly $350 to $600 for a full season of barrier treatments, depending on lot size and how wooded the property is. Quotes are free, so it costs nothing to get a real number for your yard.
From a vetted local tick exterminator serving St. Charles County. No cost, no obligation.
Common questions about ticks in St. Charles County
Which towns in St. Charles County have the highest tick risk?
At the summer peak, Weldon Spring Heights carries the highest modeled tick risk in St. Charles County, followed by Josephville, Weldon Spring, New Melle, St. Paul. Risk tracks how wooded a town is: forest cover across St. Charles County ranges from 28% to 84%, and the more forest and woodland edge a town has, the more habitat ticks have to quest from. West Alton sits at the low end. Every town has its own daily score, so check the one nearest you.
What ticks live in St. Charles County?
CDC surveillance records 3 established tick species in St. Charles County: Deer tick, American dog tick, Lone star tick. The lone star tick is the tick most responsible for human bites here, and its bite causes alpha-gal syndrome; the blacklegged (deer) tick, the main Lyme carrier, is a minor factor this far south. "Not established" for a species means there is no CDC surveillance record for the county, not that the tick is absent.
Is Lyme disease common in St. Charles County?
CDC reports too few cases in St. Charles County to publish a stable county Lyme rate, which is common in rural or low-population counties, and typical this far south. That does not mean the risk is zero: the lone star tick, not Lyme, is the bigger local concern.
Does St. Charles County have lone star ticks that cause alpha-gal syndrome?
Yes. The lone star tick is established in St. Charles County and is the tick most responsible for human bites in the county. Its bite can trigger alpha-gal syndrome, a delayed allergy to red meat and other mammal products, along with ehrlichiosis and STARI. Learn the symptoms and what foods to avoid.
All towns in St. Charles County
Tick risk is local. Pick the town nearest you.