No Mow May in Central PA: What It Actually Does to the Ticks in Your Yard

Every spring, a homeowner in central PA asks some version of the same question: if we skip mowing in May to help the bees, are we going to end up with a tick problem? It’s a fair question, and the answers floating around online are mostly bad. One side fearmongers:  don’t do it, your kids will get Lyme. The other side waves it off:  no studies show a link. Neither one is honest about what’s actually happening in a rural Pennsylvania yard in mid-May.

Here’s the version that’s actually true: tall grass alone is not what makes a yard tick-heavy. But the things people also do during No Mow May, letting leaf litter pile up, ignoring shaded edges, skipping the perimeter, those are exactly what ticks need. The trade-off is real, but it’s almost never the grass height that matters.

This article covers what’s actually going on with ticks in your yard right now, what the research really says about No Mow May, the central PA: specific risks worth knowing, and the property changes that actually move the needle.

Why ticks in central PA hit harder than almost anywhere else

Pennsylvania has led the country in reported Lyme disease cases for over a decade. That’s not a vibe, it’s CDC data. Central PA in particular sits in the sweet spot for blacklegged ticks (also called deer ticks): plenty of woodland edge, healthy deer populations, mild winters that don’t kill off overwintering adults, and a lot of properties that border forest.

For homeowners around Lock Haven and the surrounding counties, that means the baseline tick risk on a typical rural or semi-rural property is already higher than the national average. You don’t have to do anything wrong for ticks to be present on your land. They’re already there.

What you can control is whether the tick population on your specific property is small and pushed to the edges, or large and showing up where your kids and dogs spend time. Mid-May is when that math becomes urgent.

The stage of the tick that matters most is hatching right now

There are three stages of blacklegged tick activity, and they don’t matter equally. The one to worry about in May is the nymph.

Nymphs are tiny, easy to miss, and the single most important stage for Lyme disease transmission. The CDC has been clear on this for years: most Lyme infections come from a nymph bite that the person never even noticed.

The window of peak nymph activity in central PA runs roughly from mid-May through July. The hatch is happening now. So whatever decisions you make about your yard this month are decisions about how many nymphs your property is housing during the worst transmission window of the year.

That’s the real reason this conversation matters in May. Not because of one month of unmowed grass, but because the timing of the nymph emergence overlaps with the timing of when most homeowners are setting up their summer outdoor habits.

So what about No Mow May, does it actually attract ticks?

What does drive tick numbers on a property is something more specific: the edge habitat where short lawn meets shady, damp ground cover. The transition zone. Leaf litter under shrubs. The base of a stone wall. The underside of a woodpile. The shady strip along the property line where the forest starts. Those are where nymphs concentrate, regardless of what’s happening in the middle of your lawn.

So skipping the mow for a month isn’t the problem. Skipping the mow for a month while also letting leaf piles sit, brush stack up against the house, and the woodline creep into the lawn, that’s the problem. Those are different things, but they tend to happen together in well-meaning homeowners who are trying to “let nature take over.”

The central PA reality, why you can’t ignore the risk either way

The Vermont and Massachusetts studies are useful, but they’re not central PA. Lyme transmission rates in those states are real but lower. In Pennsylvania, the baseline tick density is higher, the white-footed mouse population (the main reservoir for Lyme bacteria) is robust, and the deer pressure on properties is significant.

What that means practically: a central PA yard cannot rely on the “studies don’t show a link” framing the same way a Vermont yard can. The starting risk is higher. The cost of getting it wrong is a Lyme infection in your kid, your dog, or yourself, and Lyme in PA is common enough that almost every household around Lock Haven has at least one story.

So the smart approach isn’t no mow at all, and it’s not skip No Mow May entirely. It’s a more honest version: support the pollinators where the risk is low, and stay tight on the parts of the property where the risk is real.

A central-PA-friendly version of No Mow May

This is the practical version most landscape blogs won’t lay out for you, because it requires being specific. Here’s what actually works on a typical Lock Haven to area property.

Keep your high-traffic zones mowed short. The lawn around the patio, the deck, the kids’ play area, the dog’s running area, those stay at three to four inches. This is where your family spends time. This is where you don’t want ticks. The grass alone wasn’t going to drive tick numbers here, but the people-and-pet traffic makes any tick presence high-consequence. So you don’t experiment in these areas.

Pick one or two zones where you let things grow. A back corner, a side strip near a fence, a designated wildflower patch. Mark it intentionally, even a simple sign that says “pollinator habitat” tells your neighbors you mean it and not that you stopped caring. These zones do real ecological work without putting your family at risk, because nobody’s walking through them.

Mow a buffer between unmowed zones and the high-traffic lawn. A three-foot wide strip of short grass between the pollinator patch and the patio is the single most effective property-level tick deterrent that exists. Ticks don’t cross sun-exposed, low-humidity short turf easily. The buffer doesn’t have to be wide, it has to be consistent.

Mow a path through the unmowed area if you want to walk through it. Same logic. The mowed path acts as a humidity-and-cover break.

At the start of June, mow the unmowed zones gradually. Don’t go from ten inches to two inches in one pass, it stresses the grass and makes it more vulnerable to weed pressure. Drop it in stages over a couple of mowings.

What the loudest voices get wrong, and what actually helps

The five property changes that actually move the needle

If you only do one thing to reduce ticks in your yard this season, don’t make it mowing more often. Make it one of these.

Clear leaf litter from the perimeter. Ticks overwinter in leaf piles. Wet, packed leaves under shrubs against the foundation or piled at the base of trees are the highest-density tick habitat on most properties. A spring cleanup that pulls leaves away from the immediate house perimeter and out toward the woodline (or into compost, well away from where you walk) has more impact than any mowing decision you’ll make.

Manage the woodline edge. The three- to six-foot strip where your lawn meets the woods is where the majority of your yard’s ticks live. Keeping that strip mowed short, clearing low brush, and pulling back overhanging branches dries out the microclimate and pushes the tick line back. You’re not trying to clear-cut the forest. You’re trying to make the immediate transition zone less hospitable.

Move woodpiles, brush, and stone piles away from the house. Tick nymphs love rock walls and stacked wood, they’re shaded, damp, and full of mice. If your firewood is stacked against your back porch, your nymph density right there is going to be high. Move it to a sunnier spot or further from where people walk.

Address the deer corridor. If deer routinely cut through your property, which they do on most rural central PA lots, they’re depositing adult ticks at every fence line, garden edge, and grazing spot. You’re not going to fence the deer out completely, but knowing where they enter and where they bed down tells you where the highest tick deposits are and where your perimeter mowing matters most.

Discourage mice. White-footed mice are the main reservoir for Lyme bacteria, the ticks that bite mice are the ones that go on to transmit Lyme to people. Mice love woodpiles, stone walls, dense low cover, and bird feeders that spill seed on the ground. Tightening those up doesn’t just reduce mice, it reduces the proportion of ticks on your property that are actually infectious.

These five property-level changes outweigh any mowing decision by a wide margin. If a landscaper or pest-control company is selling you on “we’ll spray your lawn and the ticks will go away,” what they’re really doing is treating the least tick-dense part of the property and leaving the actually-problematic edges and microhabitats alone.

Quick personal prevention checklist

This article is about your yard, not your body, but the property work only takes you so far. The other half of the equation is personal.

When professional help is the right call

For most central PA properties, the property-level work, perimeter management, leaf cleanup, edge mowing, woodpile relocation, is the higher-leverage move and can be done either as a one-time spring cleanup or as part of regular landscape maintenance.

Chemical treatments have their place, but they should be the last layer, not the first, and only after the habitat work is done. Spraying a yard without addressing the edges and microhabitats is treating a symptom while the cause sits ten feet away.

If you want a second set of eyes

The honest version on your property, not somebody else’s

We’ve been on outdoor properties around Lock Haven and the surrounding area since 2017, and tick-aware property care is one of the things that comes up in nearly every spring walkthrough. The right answer for some properties is “you’re fine, here are two things to clean up.” For others it’s a bigger conversation about the woodline, the drainage, and the way the lot was laid out. Either way, you’ll know going into the rest of the season. The bees do need a hand in May. So do your kids and your dog. Both are true at the same time, and the property work is what lets you take care of both.

Sources: CDC Lyme Disease Surveillance Data; Penn State Extension Tick Identification Resources; Vermont Center for Ecostudies tick density research; published tick-drag studies (Springfield, MA; Vermont).

Written and reviewed by Thayne Muthler, owner of Muthler Landscaping & Construction (PA HIC #PA212584). How we check facts: editorial policy.