When to plant in Catonsville, MD
USDA Zone 7bCatonsville, Maryland frost dates, USDA zone, and a full-year planting calendar, drawn from the nearest NOAA station and tuned to the local season.
Catonsville 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. Zone 7b means many perennials and even some tender shrubs overwinter in Catonsville, while your frost dates still decide when annuals go out.
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 Catonsville’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 Catonsville, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 12 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.
Catonsville planting FAQ
When is the last spring frost in Catonsville, MD?
Catonsville's average last spring frost falls near March 24 — the 50% mark at 32°F in the 1991–2020 normals. Hold tender transplants until the risk has passed, then plant out.
When is the first fall frost in Catonsville, MD?
In Catonsville, the first 32°F freeze of fall lands around November 21 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Catonsville in?
Catonsville 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 Catonsville?
There are roughly 242 frost-free days in Catonsville (a long growing season), running from the average last frost around March 24 to the first fall frost near November 21.
When should I plant tomatoes in Catonsville?
In Catonsville, start tomato seeds indoors around January 27–February 10, then transplant seedlings outdoors around March 31 once the danger of frost has passed.
Never miss a window in Catonsville
An email when it’s time to start seeds, transplant, and sow — timed to Catonsville’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Woodlawn · 5 km
- Arbutus · 5 km
- Ilchester · 6 km
- Elkridge · 8 km
- Ellicott City · 8 km
- Linthicum · 9 km
- Lochearn · 9 km
- Milford Mill · 10 km
Frost dates recorded at MD SCI CTR BALTIMORE, 12 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 Catonsville, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USW00093784. Retrieved from https://blissgarden.com/maryland/catonsville.