Robotic snow removal in Maryland: the I-95 line, the Shore, and Garrett County

Maryland is small enough to drive across in a morning and big enough to contain three different winters. Salisbury averages 8 inches of snow a year. Baltimore averages about 19. Oakland, in Garrett County, averages more than 100. Zippy Lawnz is headquartered in Easton, so the Shore is home turf, and here’s how we think about a robot everywhere from the beach to the mountains.

How much snow, where

Average annual snowfall (NOAA 1991–2020 normals where available; approximate where noted):

Area	Average snowfall	Notes
Baltimore (BWI)	19 in	About 4 days a year with 2 inches or more; a 6-inch storm most years but not all
Columbia / Howard County	20–28 in
Bel Air / Harford	19–24 in
Westminster / Carroll	20 in; northern Carroll 34 in
Rockville / Bethesda / Silver Spring	14–17 in	Upcounty Damascus and Clarksburg roughly double that
Frederick	17 in; Emmitsburg 28 in
Hagerstown	About 27 in
Annapolis	12–15 in (approximate)	No official station in town
Easton / Talbot	14 in
Chestertown	17 in
Cambridge / Dorchester	8–14 in
Salisbury	8 in
Ocean City	4–6 in
Cumberland	29 in
Frostburg	72 in
Oakland / Deep Creek Lake	105 in	2025–26 passed 120 inches by mid-March

The 2022–23 winter delivered two-tenths of an inch at BWI. The 2009–10 winter delivered 77. Both are Maryland.

The line down I-95

The National Weather Service puts it plainly: the rain/snow line commonly sits over or near the I-95 corridor. Southeast of it you get rain or a mix; northwest of it you get snow, often with sleet and freezing rain mixed in. That’s why Frederick and Carroll get more than Baltimore, why the Shore usually gets rain, and why every forecast within thirty miles of the Bay is a coin flip until it isn’t.

It also means Maryland snow is almost always wet: dense, near-freezing, heavy. The January 2022 Shore storm fell at 1 to 2 inches an hour as heavy, wet snow; the January 2026 storm changed to sleet and freezing rain by late morning. For a robot, that’s the timing game: clear early, in thin layers, so heavy snow never gets deep. And it means freezing rain days are a de-icing job, not a blower job.

The storms that matter

Nor’easters are the state’s dangerous storms — on average one every several years, with an unprecedented three in the 2009–10 winter. The list: 24.8 inches at BWI in Snowmageddon (February 2010), 26.8 in February 2003, and the all-time record 29.2 in the January 2016 blizzard. More recently, the January 25–26, 2026 storm gave BWI 11.3 inches, its biggest since 2016, with more than 10 in Columbia and Bel Air.

And then the Shore’s turn: the February 2026 blizzard dropped 10.8 inches on Salisbury and 10.5 on Ocean City with 60 mph gusts and 15,000 homes dark in Worcester County — while Baltimore got an inch. A robot that clears through the storm doesn’t care which side of the Bay the storm picks; it’s already home.

Sidewalk deadlines

Maryland has some of the shortest sidewalk clocks in our service area. Deadlines after snowfall ends, from county and city codes:

Jurisdiction	Deadline	Notes
Baltimore City	3 hours (by 11 a.m. if it stops overnight)	$50 residential; don’t block gutters or bike lanes
Annapolis	3 hours (same overnight rule)	$100; new fees of $200–$2,000 if the city clears it for you
Frederick	12 hours	4-foot path; $100 after a warning
Gaithersburg	12 hours
Montgomery County	24 hours	Wheelchair-width path; $50
Baltimore County, Hagerstown, Westminster, Easton	24 hours	Westminster wants a 30-inch path
Salisbury	24 hours (by 2 p.m. if overnight)	4-foot path
Anne Arundel County	24 hours under 3 inches, 48 hours over	New rules effective January 2026
Rockville	24, 48, or 72 hours by depth
Howard County, Prince George’s County	48 hours	Prince George’s inspects and can fine daily

Ocean City had no clear published rule when we checked; ask Public Works. Nearly everyone prohibits throwing snow into the street, which we build into the throw zones for walks and aprons.

Three hours is not a lot of time on a Tuesday morning. It is plenty of time for a robot that started clearing at midnight.

The berm and the brine

Every Maryland county says the same thing about the pile the plow leaves across your driveway: it’s yours. Anne Arundel calls it “an unavoidable byproduct.” We time a pass for it.

The State Highway Administration went into last winter with 386,000 tons of salt and 1.6 million gallons of brine, and brine pre-treatment has roughly halved the state’s salt use. The practical effect on a driveway near a state road is salty slush that’s heavy and sticky and a berm that refreezes hard. Salt residue is also hard on equipment, which is why tracks get rinsed and greased on service visits.

Power, ice, and trees

In Maryland it’s ice, not depth, that takes the power out: the February 2014 ice storm left thousands dark for days in Carroll, Frederick, and Baltimore counties, while last January’s foot of snow barely registered at BGE. Delmarva Power notes that trees cause about half of its outages. A robot on a dark dock waits, but it’s usually fully charged before the storm, and one charge clears a normal driveway several times over. On a managed plan, monitoring tells us the moment a dock goes dark.

HOAs, Columbia, and Annapolis brick

Roughly four in ten Maryland homeowners live under an HOA, and Columbia’s entire city functions as one. HOA plow contracts cover streets, not driveways, and run on 2- to 4-inch triggers. Quiet hours are standard; quiet mode handles the overnight passes. In historic Annapolis, brick walks and paver drives get the surface-specific setup: spikes off, intake up.

Incentives, honestly

Pepco and Delmarva Power offer instant discounts at Maryland retailers on electric mowers, chainsaws, and snow blowers through the EmPOWER program. They don’t publish whether a robotic system qualifies, so assume it doesn’t unless a retailer confirms it. BGE lists no outdoor-equipment rebate. We’ll tell you if that changes.

Your crew

The Eastern Shore is home base: Zippy Delmarva in Easton, 410-226-6705, [email protected]. Across the Bay — Baltimore, Annapolis, the DC suburbs, Frederick, and points west — email the Delmarva crew; winter routes expand every season and we’ll tell you honestly whether we can reach you. Trace your driveway from satellite to start, or see all service areas.