California · West
Tick risk in Marin County, California
Marin County covers 23 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 Marin County
Peak-season modeled risk. Tick risk is local, even within one county.
At the summer peak, tick risk across Marin County runs from Ross (moderate) at the high end to San Rafael (low) at the low end. The difference is habitat: forest cover across the county ranges from 42% to 94%, and more forest and woodland edge means more places ticks can quest for a host.
- RossModerate risk
- InvernessModerate risk
- KentfieldModerate risk
- Tamalpais-Homestead ValleyModerate risk
- Lagunitas-Forest KnollsModerate risk
Tick species in Marin County
CDC county surveillance (established or reported)
- Deer tickReported
- American dog tickReported
- Lone star tickNot established
- Gulf Coast tickNot established
Reported in this county for the deer tick, the main Lyme carrier. “Not established” means no CDC surveillance record for Marin 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 Marin 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 Marin County, CA
Professional tick control across Marin 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 Marin County's more wooded towns.
How much does tick control cost in Marin County?
Most Marin 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 Marin County. No cost, no obligation.
Common questions about ticks in Marin County
Which towns in Marin County have the highest tick risk?
At the summer peak, Ross carries the highest modeled tick risk in Marin County, followed by Inverness, Kentfield, Tamalpais-Homestead Valley, Lagunitas-Forest Knolls. Risk tracks how wooded a town is: forest cover across Marin County ranges from 42% to 94%, and the more forest and woodland edge a town has, the more habitat ticks have to quest from. San Rafael sits at the low end. Every town has its own daily score, so check the one nearest you.
What ticks live in Marin County?
CDC county surveillance does not yet list an established tick species for Marin County, but that reflects a surveillance gap, not absence. The blacklegged (deer) tick, the main Lyme carrier, is found across the west. Take the usual precautions after time outdoors.
Is Lyme disease common in Marin County?
CDC reports too few cases in Marin County to publish a stable county Lyme rate, which is common in rural or low-population counties. That does not mean the risk is zero: Lyme and other tickborne illnesses occur across the Northeast.
All towns in Marin County
Tick risk is local. Pick the town nearest you.