Maryland sits in the transition zone and runs under one of the strictest lawn-fertilizer laws in the country, thanks to the Chesapeake Bay. Turf-type tall fescue is the dominant lawn grass statewide, blended with Kentucky bluegrass, with warm-season Bermuda and zoysia on sunny lots and in the warmer Eastern Shore and southern counties. The state ranges from the cool western mountains around Cumberland to the humid coastal plain, but the fertilizer law applies the same everywhere — and it shapes the calendar.
Here's what every Maryland homeowner must know: the Maryland Lawn Fertilizer Law bans fertilizer application between November 16 and March 1, prohibits phosphorus except for new lawns or soils a test shows are deficient, requires part of the nitrogen to be slow-release, and limits application rates. That means your fall feeding must go down before mid-November, and your maintenance fertilizer must be phosphorus-free. It's a real legal constraint protecting the Bay, not a guideline — buy fertilizer labeled for Maryland and mind the dates.
Beyond the law, the calendar follows the transition-zone pattern. For the cool-season fescue majority: a spring pre-emergent at forsythia bloom, survival through a hot, humid Maryland summer, and a fall of aeration, overseeding, and feeding — finished before the mid-November cutoff. Maryland summers thin fescue, so the fall recovery seeding is essential every year. For warm-season Bermuda and zoysia, the calendar inverts: scalp at green-up, feed through summer, stop by late summer. Know your grass, mind the Bay law, and time everything to the soil.
Compare similar calendar patterns
Maryland is in the transition zone group. These states follow similar seasonal logic, though local soil, elevation, and weather still matter.
Calendars are general regional guidance for The Lawn Report. Local microclimates, soil, and current weather always come first.