When to plant in Westminster, MD
USDA Zone 7aHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Westminster, Maryland — all computed from Westminster's nearest NOAA weather station.
These dates come from a station roughly 21 km away, the closest with full normals; terrain around Westminster (elevation, water, pavement) can move your real frost dates a few days either way. In zone 7a, Westminster supports a wide range of perennials year-round; the frost dates above are what set your annual vegetable timing.
The average first fall frost in Westminster is now 5 days later than in the 1981–2010 normals. See how frost dates are shifting nationwide →
Frost probability
HANOVER 4 SW · 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 Westminster’s own odds, recorded at HANOVER 4 SW.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 22 | May 7 | Apr 22 | Sep 28 | Oct 8 | Oct 21 |
| 32°F | May 11 | Apr 24 | Apr 9 | Oct 6 | Oct 20 | Nov 2 |
| 28°F | Apr 26 | Apr 9 | Mar 26 | Oct 14 | Oct 31 | Nov 14 |
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 Westminster, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 26 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.
Westminster planting FAQ
When is the last spring frost in Westminster, MD?
Plan for the last spring frost in Westminster around April 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 Westminster, MD?
Expect Westminster's first fall frost near October 20 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is Westminster in?
Westminster is in USDA hardiness zone 7a. In zone 7a, winters are moderate — most common vegetables grow well in season.
How long is the growing season in Westminster?
Westminster has about 179 frost-free days — a moderate growing season — between the average last spring frost (April 24) and first fall frost (October 20).
When should I plant tomatoes in Westminster?
For Westminster, sow tomatoes indoors about February 27–March 13 and move the seedlings out around May 1, after the last spring frost.
Never miss a window in Westminster
An email when it’s time to start seeds, transplant, and sow — timed to Westminster’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Eldersburg · 20 km
- Reisterstown · 21 km
- Hanover · 26 km
- Owings Mills · 26 km
- Randallstown · 29 km
- Linganore · 31 km
- Milford Mill · 33 km
- Green Valley · 33 km
Frost dates recorded at HANOVER 4 SW, 21 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 Westminster, MD — Frost Dates & Zone 7a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00363665. Retrieved from https://blissgarden.com/maryland/westminster.