When to plant in North Potomac, MD
USDA Zone 7bNorth Potomac, Maryland frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Zone 7b means many perennials and even some tender shrubs overwinter in North Potomac, while your frost dates still decide when annuals go out.
Frost probability
ROCKVILLE 1 NE · 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 North Potomac’s own odds, recorded at ROCKVILLE 1 NE.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 5 | Apr 16 | Mar 31 | Oct 12 | Oct 25 | Nov 7 |
| 32°F | Apr 15 | Apr 1 | Mar 19 | Oct 24 | Nov 6 | Nov 21 |
| 28°F | Apr 4 | Mar 22 | Mar 5 | Nov 5 | Nov 19 | Dec 6 |
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 North Potomac, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 21 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.
North Potomac planting FAQ
When is the last spring frost in North Potomac, MD?
On average, the last spring frost in North Potomac is around April 1 (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 North Potomac, MD?
Expect North Potomac's first fall frost near November 6 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is North Potomac in?
North Potomac 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 North Potomac?
There are roughly 219 frost-free days in North Potomac (a long growing season), running from the average last frost around April 1 to the first fall frost near November 6.
When should I plant tomatoes in North Potomac?
In North Potomac, start tomato seeds indoors around February 4–February 18, then transplant seedlings outdoors around April 8 once the danger of frost has passed.
Never miss a window in North Potomac
An email when it’s time to start seeds, transplant, and sow — timed to North Potomac’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Travilah · 4 km
- Gaithersburg · 7 km
- Rockville · 7 km
- Germantown · 9 km
- Redland · 9 km
- Flower Hill · 9 km
- Potomac · 10 km
- Montgomery Village · 11 km
Frost dates recorded at ROCKVILLE 1 NE, 8 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 North Potomac, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00187705. Retrieved from https://blissgarden.com/maryland/north-potomac.