Should I raise every sprinkler head before mowing season?

Only if heads sit below the cut height or stay buried in thatch. Raising them slightly above the soil line and keeping thatch under control usually prevents hits without creating trip hazards.

Can a string trimmer damage sprinkler heads too?

Yes, if you angle the head into the plastic. Hold the trimmer vertical, keep the line short, and work around the collar instead of pressing into the nozzle.

What if I already cracked a head while mowing?

Cap or shut off that zone if water is gushing, replace the nozzle or head soon, and flag the location so the next mow does not hit the open riser.

How to Protect Sprinkler Heads, Valve Boxes, and Landscape Lights While Mowing

In-ground hardware is easy to miss until a blade clips it. Learn a quick pre-mow scan and deck habits that keep irrigation and lights intact without slowing every cut.

Protect sprinkler heads, valve boxes, and low landscape lights by finding them before the first pass, raising the deck slightly over hardware, and finishing those spots with a trimmer instead of driving the blade into plastic. One clipped head can flood a strip of lawn and turn a routine mow into an irrigation repair.

Why hidden hardware gets hit

Pop-up heads settle or get buried under thatch. Valve box lids sink flush with the turf. Path lights sit at ankle height near bed edges. When grass is tall or you are rushing after rain, the deck can shear a nozzle, crack a lid, or snap a fixture wire. The damage is often quiet until the next watering cycle leaves a dry ring or a muddy crater.

Do a two-minute walk before you start

Walk the lawn with the same eyes you use for toys and pet waste:

Mark every head you can see with a short flag, golf tee, or a light ring of mulch so it stays visible in tall grass.
Note valve boxes near sidewalks, foundation beds, and property corners—these are common strike zones on turns.
Check low lights along walks and driveways; unplug or set aside any fixture that leans into the mowing path.

If you hired a crew last season, ask where zones start. A quick map of heads saves more time than it costs.

Mow in a pattern that keeps blades off plastic

Keep the deck level and avoid diving into dips where a head may sit lower than the surrounding turf. On the first pass near beds and walks, leave a hand’s width of uncut grass around marked hardware, then finish that collar with a string trimmer held vertical—not angled into the head. Never try to “shave” flush against a pop-up; the blade will win, and the plastic will lose.

When grass is wet or the lawn is overdue, raise the cutting height for the whole yard rather than forcing a low cut over buried lids. Scalping near hardware exposes it next week and invites the same collision again.

Mistakes that turn into repairs

Assuming every head still pops up to the same height after soil settled.
Backing the mower over a valve box on a tight turn.
Using a heavy roller or thatching tool without locating lids first.
Leaving broken head fragments in the turf, which can shred a future blade.

If you would rather not do it yourself

A careful mowing crew that knows your irrigation layout is worth more than the lowest per-visit price when you have dense heads or low lighting. How to choose a lawn care company covers what to ask before you book. You can also browse lawn mowing services on Scaperweb and compare providers who will walk the yard with you on the first visit.

Final Thoughts

A short scan, visible markers, and finishing around hardware with a trimmer protect both the lawn and the irrigation system that keeps it green. Pair safer mowing habits with the right watering routine and easy lawn care tips so one clipped head does not undo a season of care.

Frequently Asked Questions

Should I raise every sprinkler head before mowing season?: Only if heads sit below the cut height or stay buried in thatch. Raising them slightly above the soil line and keeping thatch under control usually prevents hits without creating trip hazards.
Can a string trimmer damage sprinkler heads too?: Yes, if you angle the head into the plastic. Hold the trimmer vertical, keep the line short, and work around the collar instead of pressing into the nozzle.
What if I already cracked a head while mowing?: Cap or shut off that zone if water is gushing, replace the nozzle or head soon, and flag the location so the next mow does not hit the open riser.

How to Restart Your Sprinkler System in Spring Without Damaging Heads
A careful spring startup finds leaks, stuck valves, and cracked heads before you flood the lawn. Follow a zone-by-zone sequence instead of blasting full pressure at once.
How to Change Your Mowing Pattern Each Week to Reduce Lawn Wear
Repeating the same mowing path packs soil and flattens grass in the same tracks. Learn how to rotate patterns so turf recovers between visits.
How to Map Your Sprinkler Zones So You Can Fix Dry Spots Without Guessing
A dry patch is not always a broken head. Learn how to run one zone at a time, mark what it covers, and match the brown spot to a valve instead of raising every run time.
How to Mow After Overseeding Without Tearing Out New Grass
New seedlings cling to the soil by a thread. Learn when the first cut is safe, how high to set the deck, and which turns and bagging habits pull young grass back out.