When to plant in Dundalk, MD
USDA Zone 8aEverything below — frost dates, hardiness zone, and what to plant when in Dundalk, Maryland — is derived from the closest NOAA station with complete climate normals.
Dundalk enjoys a long ~242-day frost-free season — you can succession-sow, fit in a second crop, and grow long-season heat-lovers with room to spare. In zone 8a, Dundalk 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 Dundalk’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 Dundalk, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 20 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.
Dundalk planting FAQ
When is the last spring frost in Dundalk, MD?
Plan for the last spring frost in Dundalk around March 24 (the date it has a 50% chance of a 32°F freeze). Anything frost-sensitive should go out after it.
When is the first fall frost in Dundalk, MD?
The first fall frost in Dundalk typically arrives around November 21 (50% probability at 32°F). Harvest or protect frost-sensitive crops before then.
What hardiness zone is Dundalk in?
Dundalk is in USDA hardiness zone 8a. In zone 8a, winters are mild — many tender perennials overwinter here.
How long is the growing season in Dundalk?
Dundalk 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 Dundalk?
For Dundalk, 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 Dundalk
An email when it’s time to start seeds, transplant, and sow — timed to Dundalk’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Essex · 6 km
- Rosedale · 7 km
- Middle River · 10 km
- Rossville · 10 km
- Baltimore · 10 km
- Overlea · 11 km
- Riviera Beach · 12 km
- Brooklyn Park · 12 km
Frost dates recorded at MD SCI CTR BALTIMORE, 10 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 Dundalk, MD — Frost Dates & Zone 8a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00093784. Retrieved from https://blissgarden.com/maryland/dundalk.