When to plant in White Marsh, MD
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for White Marsh, Maryland — all computed from White Marsh's nearest NOAA weather station.
With about 242 frost-free days, White Marsh supports back-to-back plantings; stagger sowings every few weeks to keep beds productive spring through fall. Heads up: the nearest complete-normals station is about 17 km from White Marsh, so your yard's frost dates can differ — a low spot or a paved city center can shift them by a week. In zone 7b, White Marsh supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
Frost probability
MD SCI CTR BALTIMORE · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are White Marsh’s own odds, recorded at MD SCI CTR BALTIMORE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 15 | Apr 3 | Mar 22 | Oct 29 | Nov 10 | Nov 24 |
| 32°F | Apr 4 | Mar 24 | Mar 8 | Nov 7 | Nov 21 | Dec 8 |
| 28°F | Mar 26 | Mar 11 | Feb 24 | Nov 18 | Dec 5 | Dec 25 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in White Marsh, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 27 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
White Marsh planting FAQ
When is the last spring frost in White Marsh, MD?
On average, the last spring frost in White Marsh is around March 24 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in White Marsh, MD?
The first fall frost in White Marsh typically arrives around November 21 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is White Marsh in?
White Marsh is in USDA hardiness zone 7b. In zone 7b, winters are moderate — most common vegetables grow well in season.
How long is the growing season in White Marsh?
White Marsh has about 242 frost-free days — a long growing season — between the average last spring frost (March 24) and first fall frost (November 21).
When should I plant tomatoes in White Marsh?
For White Marsh, sow tomatoes indoors about January 27–February 10 and move the seedlings out around March 31, after the last spring frost.
Never miss a window in White Marsh
An email when it’s time to start seeds, transplant, and sow — timed to White Marsh’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Rossville · 3 km
- Perry Hall · 3 km
- Honeygo · 4 km
- Middle River · 5 km
- Overlea · 5 km
- Carney · 6 km
- Rosedale · 7 km
- Parkville · 8 km
Frost dates recorded at MD SCI CTR BALTIMORE, 17 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in White Marsh, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00093784. Retrieved from https://blissgarden.com/maryland/white-marsh.