When to plant in Lanham, MD
USDA Zone 7bHere are the average frost dates, USDA hardiness zone, and a month-by-month planting calendar for Lanham, Maryland — all computed from Lanham's nearest NOAA weather station.
Zone 7b means many perennials and even some tender shrubs overwinter in Lanham, while your frost dates still decide when annuals go out.
Frost probability
GLENN DALE BELL STN · 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 Lanham’s own odds, recorded at GLENN DALE BELL STN.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | May 20 | May 3 | Apr 18 | Sep 30 | Oct 12 | Oct 26 |
| 32°F | May 9 | Apr 22 | Apr 3 | Oct 7 | Oct 22 | Nov 6 |
| 28°F | Apr 30 | Apr 7 | Mar 23 | Oct 16 | Nov 1 | Nov 15 |
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 Lanham, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 13 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.
Lanham planting FAQ
When is the last spring frost in Lanham, MD?
On average, the last spring frost in Lanham is around April 22 (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 Lanham, MD?
In Lanham, the first 32°F freeze of fall lands around October 22 on average. Time your last harvests and any season-extension cover before it.
What hardiness zone is Lanham in?
Lanham 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 Lanham?
There are roughly 183 frost-free days in Lanham (a moderate growing season), running from the average last frost around April 22 to the first fall frost near October 22.
When should I plant tomatoes in Lanham?
In Lanham, start tomato seeds indoors around February 25–March 11, then transplant seedlings outdoors around April 29 once the danger of frost has passed.
Never miss a window in Lanham
An email when it’s time to start seeds, transplant, and sow — timed to Lanham’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Seabrook · 2 km
- New Carrollton · 3 km
- Mitchellville · 4 km
- Glenn Dale · 4 km
- Greenbelt · 5 km
- Lake Arbor · 6 km
- Landover · 6 km
- East Riverdale · 6 km
Frost dates recorded at GLENN DALE BELL STN, 3 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 Lanham, MD — Frost Dates & Zone 7b." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00183675. Retrieved from https://blissgarden.com/maryland/lanham.